Lupine Flower Germination. Riverbank Lupine The riverbank lupine has the most uses and benefits among the lupine flower species. Plant the lupine seeds directly into the garden in spring when all danger of frost has passed.
Plant the lupine seeds directly into the garden in spring when all danger of frost has passed. Perennial Lupines can be propagated by cuttings or division. In general lupines usually will not germinate in temperatures below 32 degrees F or above 86 degrees F with cooler temperatures leading to slower.
The seed packets said to expect 14-28 days for germination so I was happily surprised to see ours sprout in less than 10 days.
You can do this by soaking the seeds in warm water for a few hours or by scarifying them with sandpaper or a small file to help them absorb water. Wild lupine seeds may germinate the same season they appear or they can remain dormant for at least three years. For an indoor start plant seeds 6-8 weeks before the last frost in your area. Growing Lupine from Seed Johnnys Selected Seeds Lupine - Key Growing Information DAYS TO GERMINATION.