Online Plant Databases
People often ask where I search out new plants for my designs. Besides books, I enjoy perusing online plant databases. These are great for narrowing down choices by picking key plant characteristics. For instance I can search for a 24" tall perennial that likes sun, has purple flowers, thrives in zone five, plus has an upright form. A great way to narrow down thousands of plants to two or three. Note that none of these are inclusive, so you'll have to use a combination of sites to find a good selection of plants.
Here are some of my favorites:
Here are some additional database suggestions from all of you!
Great Plant Picks (Pacific Northwest)
Nursery Guide (Oregon)
Waterwise Database (zones 8-11)
The database below actually helps you ID plants. Love it!
This plant database is subscription-based. It has a wealth of plant information from Australia, but has spread into other parts of the world too.
Happy plant hunting!