Lupine (Lupinus spp.) are old-fashioned perennial flowers usually seen growing wild in areas with cool climates. Lupine's brightly colored spikes of blue, yellow, pink, purple or white will add interest in the home landscape where lupine seeds can be planted in borders, or scattered wildflower fashion. Lupine is also known as "Texas Bluebonnet."
Wrap lupine seeds in a damp paper towel. Place the paper towel in a zip-lock bag and put the bag in the refrigerator for a week before you're ready to plant. Although the seeds can be planted without chilling, a period of cold will speed germination.
Plant lupine seeds in spring after the danger of frost has passed or in the autumn, so they'll grow the following spring.
Plant where the lupine will be exposed to sunlight for at least six hours every day. Cultivate the top 2 to 3 inches of the soil lightly with a garden fork or rake before planting. The seeds should be covered lightly with soil, no more than 1/8 inch. If you prefer, you can scatter the seeds onto a meadow or open area for a natural appearance.
Keep the soil moist. During hot weather, water the lupine plants at least once or twice every week.
Fertilize lupine once every month during spring and summer, using an all-purpose organic fertilizer. Apply the fertilizer according to the directions on the package label.
Pinch the blooms off lupine plants when they wilt. Removing the blooms will promote continued blooming as long as possible. Blooms left on the plant will cause the lupine to go to seed.