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How to Grow Larkspur Fire Mixed Flowers:Growing larkspur flowers (Consolida sp.) provides tall, early season color in the spring landscape. Once you learn how to grow larkspur, you will likely include them in the garden year after year. Deciding when to plant larkspurs will depend somewhat on your location. Once established, however, larkspur flower care is simple and basic.larkspur plants are grown from seeds, though planting larkspur seeds can be challenging. When planting larkspur seeds, they must have a cold period before germination. This can be accomplished before planting the seeds, after planting the seeds in peat pots, or after sowing the seeds directly in the flower bed.If there is a building, basement or cold room where temperatures will remain between 40 and 50 F. (4-10 C.), plant them in moist soil and chill them there for two weeks. Keep in mind that larkspur seeds often will not germinate at temps above 65 F. (18 C.).Plant Propagation:Larkspur are started from seed. Directly sow Larkspur seeds into your flower garden after all danger of frost.Sow seeds early in the season and cover lightly with 1/8" of garden soil. Space them 4 inches apart and thin seedlings to 10-12 inches apart.Larkspurs are Rhizomes. You can separate the rhizomes of established plants and replant in new areas.