Sources

General guidance on this site follows widely published beginner gardening practice: match crops to your USDA-style hardiness zone group, check your average last spring frost date, measure soil temperature before sowing, and confirm specifics with your local agricultural extension service or nursery. Zone groups (3-4, 5-6, 7-8, 9-10) are broad groupings used for beginner guidance, not a substitute for your exact local zone. Figures marked 'verify locally' in the plant and soil guides are explicitly unverified and are shown only as the original copy's general ranges.