Delphiniums

Delphiniums can be propagated by taking cuttings, dividing mature clumps, or sowing seeds. 

Cuttings

1. In spring, take a sharp knife to cut a new shoot from the base of the plant. 
2. Cut just below the soil surface, and remove the lower leaves so half of the stem is bare. 
3. Dip the base of the cutting in rooting hormone powder to prevent rotting.  Insert the cutting into a pot filled with compost or perlite. 
4. Place the pot in a warm, bright location, like a windowsill, or cover it with a plastic bag. 
5. Water well and wait for roots to form. This usually takes about 10 days. 
6. Once rooted, transplant the cutting into a pot.  Plant in the garden in early summer. 

Division

1. In spring, divide a mature clump of delphiniums into 2–4 pieces. 
2. Discard the woody center of the clump. 
3. Ensure each division is healthy and free of disease. 
4. Replant the divisions in well-draining soil with proper water and light. 

Seeds

1. Sow seeds in pots in spring at a temperature of 55°F (13°C). 
2. Keep the soil moist but not soggy, and provide good air circulation. 
3. Seedlings should appear in about 14 days. 
4. New plants should flower in about 18 months. 

Delphiniums are poisonous, so wear gloves when handling them.