Growing blackberry lily

Question

When is the best time to plant blackberry seed?

Answer 1

You can plant the seeds outdoors in the fall. To have more reliable establishment, first cold-stratify the seeds as described here:

https://www.gardeningknowhow.com/garden-how-to/seeds/seed-stratification.htm

Plant the stratified seeds indoors in the early spring, keep moist until they germinate, then transplant outside after the risk of frost has passed.