Delphinium

Grow delphiniums in rich, well-drained soil with a pH of 6.5-7.5, preferably where summers are cool. Add compost and provide moderate balanced feeding; stake stems early to prevent wind damage.

Sun

Full sun

Water

1 in/week, even

Spacing

18 in

First harvest

Perennial; blooms year 1-2

Tips

• Set crowns at nursery depth about 18 inches apart and install stakes before stems elongate.
• Supply about 1 inch of water weekly at soil level without leaving crowns waterlogged.
• Feed with a balanced fertilizer in spring according to the label and remove spent spikes to encourage side shoots.
• Protect emerging growth from slugs and watch for powdery mildew on crowded plants.
• Keep all parts away from children, pets, and livestock because delphiniums are toxic if swallowed.