Botanical gardens
A botanical garden grows labeled plant collections for display, research and education. Many combine outdoor gardens with a conservatory, a visitor center and seasonal displays. 285 gardens in this directory list themselves this way.
Arboretums
An arboretum is a collection of trees and shrubs, often spread across large grounds with walking trails. Campus arboretums are often free to walk but may have limited parking. 162 gardens here are arboretums.
Conservatories
A conservatory is a glass house for plants that need warmth or protection. Indoor collections can close for installation or have timed tickets even when outdoor grounds are open. 49 gardens here include one.
Other kinds
Display gardens, native plant gardens, Japanese gardens and rose gardens appear as types on each garden page. Use the garden type filter on any state or search page to narrow a list.