Plant in spring, after average last day of frost. Plant as late as two months before first fall frost. (When choosing your garden location, note that plants have long taproots, making them difficult to transplant.)
Start seeds indoors 8-10 weeks before average last frost.
(When choosing your garden location, note that plants have long taproots, making them difficult to transplant.)
Ensure that temperatures are mild and all chance of frost has passed before planting out, as Centurion shield is a hardy plant.