I have said zonal for us. USDA has moved our zone growing and freezing as Zone 5 but as I started this business 27 years ago we were always zone 4. I give some thought to what zone 5 plants you put in as where they grow protected or out in the open. Will you mulch in the fall to cover the crown and keep them from getting too cold?
The second thing to look at with the perennial plant as well as the annual plants is how much sun does it need. You will see full sun, part sun and part shade on the descriptions. Full sun means the plant needs at least 8 hours of sun, while part sun is 6 hours and part shade is 3 to 4 hours of sun. Every plant will need sun, so deep shade it is really hard to grow plants or even grass. Till next time, this is Becky Litterer from Becky's Greenhouse, Dougherty Iowa