I Have Some Young Delphinium Plants In Pots, About 6-8” Tall.

Question

I know delphiniums die right down in winter so my question is; should I plant them out in the autumn or wait until spring? Can they stay outside during the winter or should I bring them in to a conservatory?

Answer 1

Since your winters don't get much below freezing, you should be able to put them out in fall and they should have enough time to harden off before winter. If your winters are colder than what I see online, go ahead and overwinter them inside and put them out in spring.

They are typically grown from seed indoors and planted outside in spring.

https://www.gardeningknowhow.com/ornamental/flowers/delphinium/growing-delphinium-plants.htm