Choose one of the categories above for a list of plant-related websites. Selected websites are all non-commercial, without advertisements, and free-access sites. The links provided have all been checked as of March 1, 2018; however, websites are occasionally moved or deleted without notice by the authors or sponsoring agency. If you do encounter a link that no longer works or a website that has changed location, please report the problematic link to the NOPD so that we can update the link.

Cultivated Plants

Canada's Plant Hardiness Site

A map of Canada's Plant Hardiness Zones, developed at Great Lakes Forestry Centre (McKenney et al. 2001), is accessible on this site. Information on cultivated and native North American species is also presented and gardeners with a good knowledge of their plants are encouraged to enter data on which species survive in their area.

East Coast Native Azaleas

The Middle Atlantic Chapter of the American Rhododendron Society has compiled a series of beautiful webpages on the azaleas, all members of the genus Rhododendron, native to eastern North America. Many of these species are now grown as cultivated shrubs.

GardenBreizh.org - Jardins et plantes exotiques pour tout climat

An extensive website from France that contains thousands of images of cultivated plants, as well as articles on various plant groups or genera and links to botanical gardens worldwide. Click on this link, Les fiches de plantes exotiques, to access the descriptive pages for each species, including a list of cultivars. A great site for Canadian gardeners to brush up on their French. But note that the images may take a while to load.

In The Garden of Paghat the Ratgirl

An unusual name for an unusually delightful website that features excellent descriptions of cultivated species and many cultivars, photographed in their garden settings in Washington State. The home page provides a list of plant categories to browse, or access the species by scientific name.

Kemper Center for Home Gardening

A useful website for gardeners from the Missouri Botanical Garden, with plant culture information and images of different cultivars, though not all pages have images.

Landscape Plants - Oregon State University

An updated website of images of cultivated trees and shrubs, plus images of many herbaceous ornamentals. Images of plant habit, flower, fruit, leaf, bark, and twig details are provided, as well as descriptions and basic horticultural information. A great reference for gardeners.

Mansfeld's World Database of Agricultural and Horticultural Crops

A searchable database of crop plants, very useful for crop species and cultivar information, but the site does not always include the latest taxonomic information.

Photographs of the World's Bulbs

An excellent image gallery from the Pacific Bulb Society. Select a genus to access information on the species.

Plantago - Plant Index

Gardeners will appreciate learning about this interesting website, which is an index of cultivated plants available at nurseries throughout the Netherlands and Belgium. Links to images, from various sources, are provided for most species and can be accessed by botanical name or Dutch, English, German, or French common name.

Primula World - A Visual Reference for the Genus

A wonderful website compiled by Pam Eveleigh, which features over 2500 images of Primula species. A great resource for rock gardening enthusiasts.

Rhododendron and Azalea Images - American Rhododendron Society

This link brings you to a list of all Rhododendron species and hybrids. Each page includes an image and brief but useful descriptive information. For information on azalea hybrids (also in the genus Rhododendron), click on this link.

Stapeliads - Orchids of the Succulent World

A website with stunning photographs by Gerald S. Barad of the unusual Stapeliads (now in the Apocynaceae) with cactus-like stems and very un-cactus-like flowers sporting waxy, starfish-like or tassel-tipped petals; some flowers even look like sea anemones or sea cucumbers. Taxonomy students will want to read Barad's article Pollination of Stapeliads.

The Asclepiad Exhibition

Another website on the most bizarre group of cultivated plants, ranging from the starfish-like Huernia and Stapelia, to the hooded lanterns of Ceropegia, with excellent photographs by Chris Moore.

The Plant Kaleidoscope

A database of "rare and unusual" cultivated plant species in Europe, by Rainer Oberle, but very useful and interesting to Canadian gardeners.

The Succulent Plant Page

A very informative site on cactus-like plants with succulent leaves or stems by R.J. Hodgkiss. Contains links to several different groups of interesting cultivated plants.

UCONN Plant Database of Trees, Shrubs, and Vines

A very good website on cultivated plant species from the University of Connecticut's College of Agriculture in Storrs, CT. Search by plant trait of species name.