Hardiness zone is used as a broad perennial survival clue. Hardiness zone do not replace microclimate, frost dates, soil warmth, wind, or observed seasonal pattern.

While the weather is good and it's not too dry l'm making a new addition to the propagation arsenal. It should be ideally sited in a moist semi shaded area, perhaps at the edge of a tree line. Step 1. Mark the bed and clear off the turf to the edge. Step 2. Broadfork in two directions and add compost and sharp sand ( if it needs drainage) Step 3. Leave a day or so to dry, then make a tilth with a clod breaker or rake. Step 4. Mulch with fine compost, wood chip or leaf mold. The bed is then ready for when you find cutting stock or perennial divisions, and if you're given plants or tree seeds. It is a safe place to keep plant material and young plants until you're ready to find them permanent homes .

Interesting video https://youtu.be/30J7GNcuvEc