It can be for a garden, but more interesting is to buy them in nice pots so a person can keep them in a kitchen and use them for cooking. It also can be seeds. Imagine having fresh basil or celery in your kitchen, it's a great gift for somebody who likes to cook.
Here's an idea. Buy an organizer or a blank recipe book. Write down favourite family dishes, and pass this special recepies to future generation. Use your imagination to organize and create this cookbook.
Buy a cookbook − The Food Lab: Better home cooking through science
This cookbook is a bestseller on Amazon and the New York Times bestselling winner of the 2016 James Beard Award for General Cooking and the IACP Cookbook of the Year Award. This makes it a good gift for everyone who likes to tinker around in the kitchen.