Learning Download: How to Grow Delphinium

Delphiniums are tall, beautifully colored perennial with unique foliage that typically grows best in cooler environments. They make good cutting flowers and come in a true shade of blue, as well as other shades.

Before Planting: Begin Delphinium seeds indoors in the summer. Prior to planting in a seed tray, fill the tray up to 1/2 inch from the top with a seed-starting compost that is sterile.

Planting: Once the Delphinium reaches 1 inch tall and has two true leaves, transplant the seedlings into a pot and keep the seedlings well-watered for the rest of the summer.

Watering: Keep soil moist.

Fertilizer: Once planted, feed it monthly with a powdered, all-purpose fertilizer.

Days to Maturity: Once Delphiniums are finished blooming, cut them back to the ground and new shoots may appear.

Harvesting: If Delphinium is cut and brought indoors as soon as the blooms open on the plant, the plant will bloom again.

Tips: When arranging Delphinium in a vase, add sugar, lemon juice and bleach to the water. This will preserve the arrangement so it blooms for a longer period of time.