I have a friend who likes to garden. I want to buy a gift that this friend would like.
Gardeners are sometimes easy to buy things for, and sometimes difficult.
Once you know if a gardener specializes in a particular type of gardening, you can begin to develop an idea. Buying plants for an experienced gardener can be difficult. The person may have everything needed from local and common sources, but there may be books or tools a gardener would like to own. If the gardener is just beginning, then plants may be a good choice, but books and tools are still good ideas. Talk to the gardener and ask to see the person's library and tool collection.