Everyone Says "Wait for Warm Soil" — Here's What Soil Actually Needs to Hit 60°F

https://www.mediafire.com/file/iig9qyfhcio2zqm/pdf-80055-73443.pdf/file

How my backyard experiment lost half its seedlings by planting too soon I’m going to be blunt: we all pretended that “last frost date” was the rule and started sowing when we felt optimistic