How to grow four o'clock

When to plant four o'clock

Four o'clock is a semi-woody perennial grown as an annual in colder areas. NC State plants stored tuberous roots in spring after the last frost; seed can be sown then too, and soaking seed overnight speeds germination. In zones 8 to 9 the tubers can be left in the ground to regrow.

Four O'Clock is timed by season rather than your frost dates, so the planting calendar does not generate ZIP-specific dates for it. Check the cited sources below to fine-tune for your area.