Six-Week Countdown to Frost Is Already Ticking for Spring Tulip Bulbs in Half the Country, and USDA Zone Data Shows the Window Is Closing Fast
Six weeks. That’s roughly how long spring-blooming tulip bulbs need in the ground before the soil turns hard, and for a huge swath of the country, that window is already closing as August ends. The USDA’s Plant Hardiness Zone Map, last updated at the end of 2023 using 1991-2020 climate data from more than 13,000 … Read more