Start with high-confidence gardening books, then narrow by subgenre or adjacent topics.
Martha Stewart's Gardening Handbook
Martha Stewart
Massachusetts Gardener's Companion
Barbara Gee
Soil Science for Gardeners
Robert Pavlis
A Year Full of Flowers
Sarah Raven
The Dirt-cheap Green Thumb
Rhonda Massingham Hart
Cacti
Terry Hewitt
The Southerner's Y'allmanac
Rachel Hardage Barrett
