Lupine (Lupinus Polyphyllus My Castle) If you like red, you will love these. Lupine flower seed will produce these brilliant, scarlet colored Lupine. These tall spikes are loaded with scarlet red sweet pea-like flowers. Lupines are a clump-forming perennial that are considered to be a type of wildflower. They do especially well in cooler climates. Plant Lupine My Castle in a mass planting for a breath taking show of color. They will self-seed if you do not deadhead the spent blooms. 15 seed