|A native to California's coastal mountains, this May to June flowering Larkspur grows 3 to 6 feet tall from woody roots. Flowers are red and yellow with scarlet tips on petals. Sow seeds as early as possible to ensure flowers that season. Rich, well-drained soil is a must for delphiniums and they love regular fertilizings. Delphiniums will not do well in strongly acid soils, so add lime to make soil more neutral. A little superphosphate worked into the hole when planting will result in a stronger plant. Do not cover root crown and beware: Snails and Slugs LOVE this plant, so keep area clean and free of debris.
In spring, remove all shoots, except for 2 or 3, and side dress plants with a complete fertilizer. Stake plants early and remove old flower spikes immediately after bloom, leaving only foliage. Once new shoots are several inches tall, cut old stalks back hard. If plants have been well fertilized, you should get a second flush of flowers for fall.