Amazon has a few gardening books [Kindle Edition] for $1.99
The Fruit Gardener’s Bible:A Complete Guide to Growing Fruits and Nuts in the Home Garden
The Vegetable Gardener’s Container Bible: How to Grow a Bounty of Food in Pots, Tubs, and Other Containers
Carrots Love Tomatoes: Secrets of Companion Planting for Successful Gardening