Keep watered after deadheading to keep foliage in good condition. Deadheading may encourage more flowering.
Keep in mind when planting that Cardinal is thought of as hardy, so this plant will grow or become dormant during the winter.May be grown from seed or may self seed, but may not be true to parents.
Sow at a depth of approx. 2.34 inches (6.0 cm) and aim for a distance of at least 11.89 inches (30.48 cm) between Granny's bonnet plants. Soil temperature should be kept higher than 18°C / 64°F to ensure good germination.By our calculations, you should look at sowing Cardinal about 56 days before your last frost date.
One source has it marked as Aquilegia caerulea, but this seems inaccurate.
Songbird Cardinal