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Online Plant Databases (Canada & United States)

Published on July 2, 2019Last updated November 18, 2021 ♛ By Melissa J. Will

This post contains affiliate links.
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A helpful directory of online plant databases, primarily in the United States and Canada, for information on plant names, growing zones, research, and images to help ID plants.

Also see Seed Company Listings for the United States and Canada to find a seller near you.

Popular garden plants.

Plant Databases

North America

  • All Plants | National Gardening Association Plants Database (US)
    Search by characteristics, genus, and images
  • All Plants | USDA Natural Resources Conservation Service (US)
    Includes common & scientific names, photos, growing zones
  • Identify Plants | Garden.org
    Enter characteristics to identify your plant
  • Invasive Species | invasivespeciesinfo.gov  (US)
    Includes land and aquatic plants
  • Native Plants | North American Native Plant Society Database (North America)
    Search by type, habitat, light, soil conditions
  • Native Plants Database| Lady Bird Johnson Wildflower Center (North America)
  • New England | Go Botany | Identify plants
  • Trees | What tree is it? | (Based in Ohio, US)
    Search by leaf, fruit, name
  • Weeds | New Jersey Weed Gallery and Is This Plant a Weed?

Also

  • Insects, Spiders, & More | BugGuide.net 
  • Keystone Plants by Ecoregion | The National Wildlife Federation (North America)

Canada

  • Invasive Species | invadingspecies.com (Ontario, Canada)
    Includes terrestrial and aquatic plants, fish, forest pests, invertebrates, and pathogens
  • Native Plants | Evergreen.ca (Canada)
    Browse by region, name, characteristics, and plant type or species
  • Native Plant Encyclopedia | Canadian Wildlife Federation
  • Pollinator-Friendly Native Plants | Pollinatorpartnership.ca (Canada)
  • Plant Selector For Birds By Garden Zone | Birds Canada
  • Weeds | weedinfo.ca (Canada)
    Search by broadleaf, grassy, and perennial weeds
  • Ontario CropIPM | broadleaf, grass, and perennial weed gallery
  • Identify Seeds | Canada food inspection database with images
  • BC Invasive Species | Includes plants, animals, fish, insects, and fungi

United Kingdom

  • All Plants | UK – Royal Horticultural Society (UK)
    Search by sun, soil, characteristics, plant type, or season

World Plants Database

  • All Plants | canadaplants. ca (Canada and world) – link no longer active
    Woody, bulbs, annuals, perennials, tropicals, wildflowers, and weeds

Seed Companies

  • Canadian Seed Company Listings | Online sellers
  • United States Seed Company Listings | Online sellers

Reference Book

Encyclopedia of Plants and Flowers | Amazon


Find Your Frost Dates & Hardiness Zone

  • Plant Hardiness Zones | United States flag United States | Canadian flag Canada
    These are listed on seed packets and plant tags to guide your choices.
  • Average Frost Dates | Use this calculator at Almanac.com. Enter your city and state or province to find your first and last frost dates and number of frost-free days.
  • Tips: Understanding Frosts & Freezing For Gardeners

Plants by Species / Type

  • Garden.org Online Plant Databases – all plant types
    Includes listings of online plant databases for specific states, regions, and plant species.

Here are some popular ones:

  • Clematis | Identify your clematis – good for figuring out which clematis you have
    Also see National Gardening Association Clematis Database
  • Dahlias
  • Daylillies
  • Hostas
  • Hydrangeas
  • Irises
  • Lilies
  • Ornamental Grasses
  • Peonies
  • Roses
  • Tomatoes | Cornell Database
  • Salvias
  • Sempervivium
  • Wildflowers – Regional Listings

Plant Research & Evaluations

  • Search | Google Scholar for research papers
  • Search | University Extension research papers | Check that research is peer-reviewed.
  • Reference | How to properly write plant names | PDF file
  • The Global Seed Vault in Norway | Learn how it protects seed species from around the world

Plant ID Phone Apps

IOS and Android

The idea is great: use your phone to photograph a plant you want to identify and ask the app to ID it or narrow down the options (if it’s unsure).

I can’t say I’ve ever found a plant identification app that was accurate. Out of every 10 queries, perhaps 5 might be correct.

Also, a lot of these apps seemed to have moved to a paid model where there is a fee to either buy the app or request help.

After my last round of testing, I liked this one (somewhat):
Garden Answers | http://www.gardenanswers.com/

If you’ve found one you think is excellent, I’d love to know.

Related: How to Understand Plant Names | Botanical Latin

~Melissa the Empress of Dirt ♛

Garden plants including lupines, columbine, peony, clematis.
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