What they do
Adult geometer moths often drink nectar and can transfer pollen between flowers, especially in the evening and at night.
Pollinator profile
Geometer moths
Family Geometridae
Adults can help move pollen as they nectar at flowers, and their caterpillars are an important part of local food webs.
Category
Moths
Order
Lepidoptera
Family
Geometridae
Also Known As
Geometridae, geometer moth, inchworm moth
Intro
Overview
Geometer moths are a large family of moths best known for their “inchworm” caterpillars and often subtly patterned adults. While they’re not always as noticed as bees or butterflies, many adults visit flowers for nectar and can contribute to pollination as they feed. This page explains how to spot geometer moths, what habitats and plants support them, and practical ways to help them thrive in yards, school grounds, and neighbourhood greenspaces.
At a glance
Quick Facts
Food
Night-blooming or evening-scented flowers, native shrubs, late-season asters/goldenrods
Habitat
Host plants for caterpillars, leaf litter, shrubs/trees, undisturbed corners
Seasonality
Dusk and night, sometimes daytime resting on bark or walls
Where to look
Porch lights and lit windows, garden edges, hedges, woodland edges, parks
Key takeaways
If you remember only three things
A quick summary you can scan in under 10 seconds.
What they need
A mix of nectar plants plus host plants for inchworm caterpillars, along with low-disturbance shelter.
One best action
Plant a layered mix of native shrubs and flowers so there’s food for adults and leaves for caterpillars.
Why it matters
Why they matter
Geometer moths connect plants and wildlife in quiet but important ways: adults may pollinate while feeding, and caterpillars help cycle plant material and feed many other animals. Supporting them usually means supporting broader biodiversity, because their life cycle depends on healthy plant communities.
Key Impacts
What this pollinator supports
- Adults often visit flowers for nectar and can move pollen as they feed.
- They can be especially active at dusk/night, complementing daytime pollinators.
- Many species use trees and shrubs as caterpillar food, linking pollinator habitat to urban canopy and woodland edges.
- They support a wide range of native plants indirectly by being part of local food webs (as prey for birds and other wildlife).
- Their presence can be a sign that a habitat has plant variety and reduced pesticide pressure.
Identification
Identification guide
Geometer moths can be tricky because many are well-camouflaged and vary widely in colour and pattern. Focus on overall shape, resting posture, and where/when you see them, and use photos to confirm.
1
Often hold wings flat and spread out like a triangle or shallow "V" when resting.
2
Many have fine, wavy lines or banding that blends into bark, leaves, or lichen.
3
Body is often slender compared with some other moth families.
4
Frequently seen near outdoor lights at night (but also in darker garden corners).
Range and habitat
Where they live
Geometer moths occur across many parts of the world, including a wide range of regions in Canada, and they use habitats from forests to city parks. Because different species have different host plants, the best habitats are usually those with diverse native vegetation and a mix of trees, shrubs, and wildflowers.
Gardens and schoolyards can help by adding native plants and reducing pesticide use, especially where natural habitat is fragmented.
Common Habitats
- Deciduous and mixed woodlands
- Forest edges and clearings
- Shrublands and hedgerows
- Meadows and old fields with nearby trees/shrubs
- River and ravine corridors
Life cycle
Life cycle and seasonality
Geometer moths go through complete metamorphosis: egg, caterpillar (inchworm), pupa, and adult. Timing varies by species and region, but many have adults that fly in warmer months, while caterpillars feed when host plants have fresh leaves.
Spring / Early Season
Some adults appear early; many species begin egg-laying as plants leaf out. Caterpillars of some species feed on fresh spring growth.
Summer / Mid-Season
Many adults are active at dusk/night and visit flowers for nectar. Caterpillars continue feeding on leaves of host plants.
Late Season
Some species have later flights; others finish development and prepare to overwinter. Late-blooming flowers can be important nectar sources for adults that are still active.
Winter / Dry Season
Many overwinter in a protected stage (often as pupa, egg, or caterpillar depending on species).
Late-season flowers and “leave it a little wild” shelter help because not all moths finish their life cycle at the same time.
Gardening guide
How to support in your garden
Provide the right food and habitat to help this pollinator thrive.
Plant these flowers
Nectar is a sugary liquid that fuels adult moths, and pollen is a protein-rich powder plants use for reproduction (some moths may pick up pollen while feeding). Many geometer moths nectar at small, accessible flowers, especially those that are fragrant or open into the evening.
Early season
- Native willows (early catkins)
- Native spring shrubs (general)
- Early-blooming woodland wildflowers (general)
Mid-season
- Native meadow flowers (general)
- Native shrubs with summer blooms (general)
- Herbs with small clustered flowers (general)
Late season
- Asters (native types)
- Goldenrods (native types)
- Late-blooming native wildflowers (general)
Best plant choices depend on your region; native plants are usually the best starting point.
Shelter and nesting
Geometer moths don’t build nests, but they need safe places for eggs, caterpillars, and pupae, plus calm, dark conditions for adults to feed and rest. Small changes in yard care can make a big difference for survival through the full life cycle.
Keep some leaf litter or natural mulch under shrubs and trees (where appropriate) to protect overwintering stages.
Leave a few "undisturbed corners" with stems, seedheads, and ground cover until spring cleanup.
Plant in layers (groundcovers, perennials, shrubs, trees) to create hiding and resting spots.
Avoid frequent hard pruning during peak growing season when caterpillars may be feeding.
Reduce outdoor lighting at night (or use motion sensors and warm, shielded bulbs) to limit disruption to nocturnal moths.
Threats to avoid
Geometer moths face many of the same pressures as other pollinators, especially in urban and suburban areas where habitat is simplified. Because they rely on both flowers (for adults) and host plants (for caterpillars), they can be affected by changes across the whole growing season.
Habitat loss/fragmentation that removes native trees, shrubs, and meadow edges.
Pesticides, including systemic pesticides (gets inside the plant), which can affect nectar, pollen, and leaves eaten by caterpillars.
Bloom gaps (only spring flowers) that leave little nectar later in summer and fall.
Climate stress that shifts plant timing, increases heat/drought pressure, or creates mismatches between caterpillars and leaf-out.
Light pollution that disrupts night navigation, feeding, and mating.
Take action
How to help
Helping geometer moths is mostly about restoring “complete habitat”: nectar across the season, host plants for caterpillars, and safer nighttime conditions. These steps also support many other pollinators and beneficial insects.
Plant a layered mix of native plants: flowers plus at least a few native shrubs and (where possible) native trees.
Keep a continuous bloom sequence from spring through fall (include asters/goldenrods or other late bloomers).
Avoid pesticides, especially systemic products that get inside the plant and can affect leaves and nectar.
Reduce outdoor lighting at night: turn lights off when not needed, use warm bulbs, and aim fixtures downward.
Student challenge
Do a "moth-friendly lights audit" at home or school—count outdoor lights, note which are on all night, and propose one change (timer, motion sensor, warmer bulb, or shielding).
Examples
Featured species
Examples from this subgroup. Status varies by region.
Biston betularia
Peppered moth
This well-known geometer moth is often used to teach how camouflage and environmental conditions can shape survival. Like many moths, adults may visit flowers for nectar and can play a small role in pollination.
Geometra papilionaria
Large emerald
This striking green geometer moth highlights how moth diversity includes vivid colours as well as camouflage. Adults may nectar at flowers, while caterpillars depend on suitable host plants in healthy habitats.
Operophtera brumata
Winter moth
This species is widely discussed because its timing can overlap with cool-season conditions and it can affect trees in some areas. It’s a reminder that moth life cycles are closely tied to seasonal plant growth.
Definitions
Glossary
Nectar: A sugary liquid made by flowers that fuels many adult pollinators.
Pollen: A powder produced by flowers that contains plant reproductive cells and can be moved between blooms.
Habitat: The natural “home” of a species, including food, shelter, and the conditions it needs to survive.
Native: A species that occurs naturally in a region without being introduced by people.
Invasive: A non-native species that spreads quickly and can harm local ecosystems.
Systemic pesticide: A pesticide that gets inside the plant, so insects can be exposed through nectar, pollen, or leaves.
Host plant: The plant a caterpillar eats; it’s required for moths and butterflies to reproduce.
Light pollution: Excess or poorly directed nighttime lighting that disrupts nocturnal wildlife.
Pollen: A powder produced by flowers that contains plant reproductive cells and can be moved between blooms.
Habitat: The natural “home” of a species, including food, shelter, and the conditions it needs to survive.
Native: A species that occurs naturally in a region without being introduced by people.
Invasive: A non-native species that spreads quickly and can harm local ecosystems.
Systemic pesticide: A pesticide that gets inside the plant, so insects can be exposed through nectar, pollen, or leaves.
Host plant: The plant a caterpillar eats; it’s required for moths and butterflies to reproduce.
Light pollution: Excess or poorly directed nighttime lighting that disrupts nocturnal wildlife.
What You Can Do
Make a difference for native habitats.
Turn this knowledge into action. Whether you plant a single pot or a whole garden, you are building a vital bridge for local biodiversity.
Join the movement to restore our shared habitats.
Native plants
Plants that support this pollinator
Alders
Alders are fast-growing trees in the genus Alnus that are especially useful in damp spots and along edges where you want quick cover and early-season pollen for insects.
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Asters
Asters are late-season wildflowers that bring a burst of daisy-like blooms when many gardens are winding down, making them a reliable choice for pollinator-friendly planting.
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Birches
Birches are graceful trees in the genus Betula, known for their often light-colored bark and early-season pollen and catkins that support springtime insects.
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Blueberries & huckleberries
Blueberries and huckleberries (genus Vaccinium) are berry-producing shrubs with spring flowers that can support pollinators and later feed people and wildlife—great for gardens, schoolyards, and even large containers.
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Clovers
Clovers are small, easygoing plants in the genus Trifolium that can add nectar and pollen to gardens, lawns, and pots while helping cover bare soil.
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Fireweed
Fireweed is a tough, fast-growing wildflower in the genus Chamerion that brings bright pink blooms and lots of pollinator activity to sunny, open spaces.
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Fleabanes
Fleabanes (genus Erigeron) are easygoing wildflowers with daisy-like blooms that can brighten gardens, schoolyards, and balcony pots while offering steady nectar and pollen for many small pollinators.
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Goldenrods
Goldenrods are tough, sunny wildflowers in the genus Solidago that light up late-season gardens with golden blooms and provide reliable nectar and pollen when many other flowers are fading.
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Kinnikinnick
Kinnikinnick is a tough, low-growing evergreen groundcover in the genus Arctostaphylos (often called bearberry) that forms a tidy mat and offers small spring flowers followed by red berries.
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Manzanitas
Manzanitas are tough, beautiful western shrubs with urn-shaped flowers that can feed early-season pollinators and evergreen leaves that keep gardens looking good year-round.
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Poplars, aspens & cottonwoods
Poplars, aspens, and cottonwoods (genus Populus) are fast-growing trees best known for their fluttering leaves and soft “cottony” seeds. They can support early-season pollinators with spring catkins, but they’re also big, thirsty, and often short-lived in small yards—so they’re best chosen with space and roots in mind.
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Rushes
Rushes are tough, grass-like wetland plants (genus Juncus) that thrive in damp soil and help create calm, sheltered habitat at the edges of ponds, rain gardens, and low spots.
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Sedges
Sedges (genus Carex) are grass-like plants that form tidy clumps and thrive in many garden conditions, especially where soil stays a bit damp. They add texture, cover bare ground, and can support small wildlife by providing shelter and nesting material.
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Willowherbs
Willowherbs (genus Epilobium) are easygoing wildflowers that pop up in sunny, open spots and offer simple, nectar-rich blooms that many small pollinators can use.
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Willows
Willows are fast-growing trees and shrubs in the genus Salix that offer some of the earliest pollen and nectar of the year, making them a strong choice for pollinator-friendly yards, parks, and school grounds.
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Yarrow
Yarrow is a tough, easygoing wildflower that brings long-lasting blooms and steady pollinator visits to gardens, schoolyards, and even containers.
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Regions
Where this pollinator is active
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Aberdeen Plains
Aberdeen Plains is a northern plains ecoregion where the growing season is short and conditions can be harsh for gardening.
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Abitibi Plains and Riviere Rupert Plateau
The Abitibi Plains and Riviere Rupert Plateau is largely defined by boreal forest, wetlands, and extensive freshwater networks.
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Alaska Range
The Alaska Range is a high, cold mountain landscape where plants and pollinators must make the most of a short summer.
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Aleutian Islands
The Aleutian Islands are a maritime, wind-shaped island chain with short, challenging growing conditions and many exposed sites.
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Algonquin/Southern Laurentians
Algonquin/Southern Laurentians is a forest-and-water landscape where many pollinators rely on sunny edges, openings, wetlands, and flowering understories rather than deep shade.
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Amundsen Plains
The Amundsen Plains are a northern Arctic plains region where the growing season is short and conditions are tough for typical home gardening.
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Arctic Coastal Plain
The Arctic Coastal Plain is a tundra region where plants grow low to the ground and the flowering season is brief.
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Arctic Foothills
The Arctic Foothills are a rugged transition zone where tundra landscapes meet rising hills and mountain fronts.
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Athabasca Plain and Churchill River Upland
Athabasca Plain and Churchill River Upland is a northern, boreal-leaning landscape where forests, wetlands, and river systems shape what can grow and when it blooms.
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Baffin and Torngat Mountains
The Baffin and Torngat Mountains are a dramatic Arctic mountain region where life is adapted to cold, wind, and a very short season for growth.
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Baffin Uplands
The Baffin Uplands are a High Arctic ecoregion where plants grow slowly and stay low, and where “garden-style” pollinator planting is often not practical.
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Banks Island and Amundsen Gulf Lowlands
Banks Island and the Amundsen Gulf Lowlands are part of the Northern Arctic, where plants and insects must survive extreme cold, wind, and a very short season for growth and flowering.
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Blue Mountains
The Blue Mountains are a varied mountain-and-valley landscape where forests, meadows, and river corridors can sit close together.
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Bristol Bay-Nushagak Lowlands
The Bristol Bay–Nushagak Lowlands are tundra-leaning lowlands where wetlands, river corridors, and coastal conditions shape what can grow.
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Brooks Range/Richardson Mountains
The Brooks Range/Richardson Mountains ecoregion is a high-latitude mountain tundra landscape where plants grow low to the ground and the season for flowers can be brief.
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Canadian Rockies
The Canadian Rockies are a rugged mountain region with big elevation changes, cold winters, and pockets of warmer, sunnier valley habitat.
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Cascades
The Cascades ecoregion is defined by mountains, forests, and dramatic “up-and-down” terrain that creates many local growing conditions.
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Central Angava Peninsula and Ottawa and Belcher Islands
This ecoregion is part of the Southern Arctic, where plants and pollinators must make the most of a short, intense growing season.
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Central Laurentians and Mecatina Plateau
The Central Laurentians and Mecatina Plateau is typically a softwood-shield region with forests, bogs/fens, rocky openings, and water-rich landscapes.
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Chilcotin Ranges and Fraser Plateau
The Chilcotin Ranges and Fraser Plateau includes a patchwork of plateaus, forests, grass-leaning openings, and river corridors.
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Clear Hills and Western Alberta Uplands
Clear Hills and Western Alberta Uplands is a boreal upland landscape where forests, wet areas, and stream corridors shape what can grow.
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Coastal Hudson Bay Lowland
The Coastal Hudson Bay Lowland is a cold, flat coastal region where wet ground and a short summer shape what can grow.
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Columbia Mountains/Northern Rockies
The Columbia Mountains/Northern Rockies region is a landscape of big elevation changes—forests, meadows, and river corridors stitched between steep slopes and high ridgelines.
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Copper Plateau
Copper Plateau is a boreal-cordillera plateau region where plants and pollinators often have a narrow window to grow, bloom, and reproduce.
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Coppermine River and Tazin Lake Uplands
The Coppermine River and Tazin Lake Uplands sit within the Taiga Shield, where rock, water, and boreal vegetation shape what can grow.
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Cypress Upland
Cypress Upland landscapes are shaped by elevation, exposure, and patchy moisture—meaning one yard can be quite different from another just a short distance away.
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Eastern Cascades Slopes and Foothills
The Eastern Cascades Slopes and Foothills are a transition zone: mountain-influenced landscapes that often lean dry, with big differences from one hillside or creek corridor to the next.
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Ellesmere Mountains and Eureka Hills
The Ellesmere Mountains and Eureka Hills are an extreme Arctic landscape where plants grow slowly and flowering opportunities are limited.
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Foxe Uplands
Foxe Uplands is a Northern Arctic ecoregion where the environment is tough on plants: cold, wind, and a short growing season make typical “pollinator gardening” difficult in many places.
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Great Bear Plains
The Great Bear Plains is a taiga-plains landscape where water, soil, and exposure strongly shape what can grow.
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Gulf of Boothia and Foxe Basin Plains
This Northern Arctic plains ecoregion is defined by cold temperatures, short summers, and landscapes where plants grow low to the ground.
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Hay and Slave River Lowlands
The Hay and Slave River Lowlands are a northern lowland landscape where rivers and wetlands strongly shape what can grow.
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Hayes River Upland and Big Trout Lake
Hayes River Upland and Big Trout Lake sits in the boreal “softwood shield” world of conifers, water, and wetlands.
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Hudson Bay and Hames Lowlands
The Hudson Bay and Hames Lowlands are defined by wide-open lowlands and large wetland landscapes.
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Idaho Batholith
The Idaho Batholith ecoregion is a rugged, mountainous landscape where forests, meadows, and river corridors create a patchwork of habitats.
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Interior Bottomlands
Interior Bottomlands are low-lying parts of Alaska’s boreal interior where water and soils often shape what can grow.
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Interior Forested Lowlands and Uplands
Interior Forested Lowlands and Uplands is a boreal interior landscape where forests, wetlands, and river corridors create pockets of flowering habitat.
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Interior Highlands and Klondike Plateau
Interior Highlands and Klondike Plateau is a northern inland region where elevation, slope direction, and river valleys create many “small zones” for plants.
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Kazan Rvier and Selwyn Lake Uplands
Kazan Rvier and Selwyn Lake Uplands is a northern taiga-shield landscape of rock, water, and hardy vegetation.
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Klamath Mountains
The Klamath Mountains are a complex, mountainous landscape where forests, rocky openings, and river corridors create many different growing conditions close together.
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La Grande Hills and New Quebec Central Plateau
La Grande Hills and the New Quebec Central Plateau are part of the Taiga Shield—often rocky, lake-rich, and shaped by cold-season conditions.
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Lake Nipigon and Lac Seul Upland
Lake Nipigon and Lac Seul Upland is a lake-and-forest shield region where conifer-dominated woods, wetlands, and rocky openings create a patchwork of habitats.
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Lancaster and Borden Peninsula Plateaus
The Lancaster and Borden Peninsula Plateaus are part of the Northern Arctic, where cold, wind, and a short growing season limit how much flowering habitat can develop.
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Mackenzie and Selwyn Mountains
The Mackenzie and Selwyn Mountains are a high-latitude mountain landscape where plants and pollinators must make the most of a short warm season.
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Mid-Boreal Lowland and Interlake Plains
The Mid-Boreal Lowland and Interlake Plains is a boreal-plain landscape where forests and wetlands shape what can grow and when flowers appear.
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Mid-Boreal Uplands and Peac-Wabaska Lowlands
Mid-Boreal Uplands and Peac-Wabaska Lowlands is a boreal-plain region where forests, wetlands, and open edges create a patchwork of habitats.
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Middle Rockies
The Middle Rockies are defined by rugged terrain, big elevation changes, and many “pockets” of different growing conditions.
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Newfoundland Island
Newfoundland Island includes a mix of coastal landscapes, conifer-dominated forests, wetlands, and open barrens.
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North Cascades
The North Cascades are defined by big elevation changes, forested slopes, and river valleys that create many small habitat pockets.
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North Central Appalachians
The North Central Appalachians are known for forested hills, stream corridors, and a patchwork of openings where wildflowers can thrive.
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Northern Appalachians and Atlantic Maritime Highlands
This region is a patchwork of forested mountains and uplands, with streams, wetlands, and openings that can be surprisingly rich in wildflowers.
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Northern Lakes and Forests
Northern Lakes and Forests is a lake-rich, forested shield landscape where native wildflowers often thrive in sunny openings, shorelines, and edges rather than deep shade.
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Northern Minnesota Wetlands
Northern Minnesota Wetlands are defined by water: saturated soils, standing water, and plant communities adapted to wet conditions.
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Oglivie Mountains
The Oglivie Mountains ecoregion is a cold, mountainous part of the Taiga Cordillera where plant life is shaped by short summers, elevation, and shelter from wind.
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Parry Islands Plateau
The Parry Islands Plateau is a Northern Arctic ecoregion where cold, wind, and a short growing season make gardening and long-season blooms difficult in many places.
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Peel River and Nahanni Plateaus
The Peel River and Nahanni Plateaus ecoregion is a northern landscape of broad uplands, river-cut valleys, and hardy vegetation adapted to cold conditions.
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Queen Maud Gulf and Chantrey Inlet Lowlands
This ecoregion is an Arctic lowland landscape where the season for flowering plants is short and highly weather-dependent.
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Seward Peninsula
The Seward Peninsula sits within Alaska’s tundra ecoregions, where the growing season is short and conditions can be tough for conventional gardening.
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Sierra Nevada
The Sierra Nevada is a mountain region with a wide range of habitats—from foothill woodlands to conifer forests to high-elevation meadows.
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Skeena-Omineca-Central Canadian Rocky Mountains
This is a Western Cordillera mountain region where forests, rivers, and open sunny edges create pockets of pollinator habitat.
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Smallwood Uplands
Smallwood Uplands is a northern taiga-shield landscape where water, rock, and forest shape what plants can thrive.
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Southern Rockies
This ecoregion is defined by mountain terrain, big elevation changes, and patchy habitats that can shift from dry, sunny slopes to cooler, moister pockets.
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Subarctic Coastal Plains
Subarctic Coastal Plains are open, tundra landscapes where plants must grow fast during a short summer.
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Sverdrup Islands Lowland
The Sverdrup Islands Lowland is an extreme Arctic lowland environment where plants grow slowly and flowering opportunities can be limited.
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Ungava Bay Basin and George Plateau
The Ungava Bay Basin and George Plateau is a northern Taiga Shield landscape where the growing season is typically short and gardening can be challenging.
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Victoria Island Lowlands
The Victoria Island Lowlands are an Arctic lowland ecoregion where extreme cold and a short growing season make conventional pollinator gardening difficult in many places.
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Wasatch and Uinta Mountains
The Wasatch and Uinta Mountains are defined by elevation, rugged terrain, and big differences between sunny slopes, shaded forests, and stream corridors.
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Watson Highlands
Watson Highlands is a northern, mountain-influenced boreal region where plants and pollinators must handle short summers and big swings in weather.
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Yukon Flats
Yukon Flats is a boreal interior lowland where water—rivers, wetlands, and seasonal flooding—strongly shapes habitats.
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Yukon-Stikine Highlands/Boreal Mountains and Plateaus
This region is defined by boreal mountain-and-plateau landscapes where growing conditions can be challenging but rewarding for hardy native plants.
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