Delphinium: A Guide to Growing Stunning Flowers from Seed
Introduction
Delphinium is a beautiful and striking flowering perennial that can add a touch of elegance to any garden. With its tall, stately spikes of stunning small flowers in a range of colors, it’s a popular choice for cut flowers and cottage-style gardens. However, growing delphinium from seed can be a bit challenging, as they require a good deal of care and attention.
Growing Delphiniums from Seed: A Step-by-Step Guide
Materials you’ll need:
- Delphinium seeds
- Seedling trays or pots
- Potting mix
- Watering can or spray bottle
- Refrigerator
Step 1: Germinating the Seeds
Delphinium seeds need a cold start to germinate, so place them in the refrigerator for about a week before planting. This process, known as stratification, helps to break down the seed coat and improve germination rates.
Step 2: Sowing the Seeds
About eight weeks before the last frost of spring, start your delphinium seeds indoors in seedling trays or pots filled with a well-draining potting mix. Sow the seeds thinly, covering them with about an eighth of an inch of soil. Keep the soil moist and at a temperature of about 70 to 75 degrees Fahrenheit.
Alternatively, you can sow delphinium seeds directly in flower beds in early summer. However, it’s best to germinate the seeds indoors first, as this gives them a head start and improves the chances of success.
Step 3: Caring for Seedlings
Once the delphinium seedlings emerge, make sure they get plenty of light. If you’re growing them indoors, place them under grow lights or in a sunny window. Keep the soil moist but not soggy, and fertilize them lightly every few weeks.
Step 4: Transplanting Seedlings
When the seedlings have two or more pairs of true leaves, they’re ready to be transplanted outdoors. Harden them off by gradually exposing them to outdoor conditions for about a week before transplanting. Choose a sunny location with well-drained soil and space the seedlings at least 18 inches apart.
Step 5: Ongoing Care
Delphiniums are heavy feeders, so fertilize them regularly with a balanced fertilizer. Water them deeply and regularly, especially during hot and dry weather. Deadhead spent flowers to encourage new growth and prevent self-seeding.
Troubleshooting Common Problems
- Leggy seedlings: This can be caused by insufficient light or overwatering. Provide more light and reduce watering frequency.
- Yellowing leaves: This can be a sign of nutrient deficiency. Fertilize the plants regularly.
- Powdery mildew: This fungal disease can cause white powdery spots on the leaves. Treat with a fungicide.
Tips for Success
- Choose a variety of delphinium that is well-suited to your climate and growing conditions.
- Start seeds early indoors to give them a head start.
- Provide plenty of light and water, but avoid overwatering.
- Fertilize regularly to keep the plants healthy and blooming.
- Deadhead spent flowers to encourage new growth and prevent self-seeding.
With a little care and attention, you can grow beautiful and thriving delphiniums in your garden. Enjoy the stunning blooms and add a touch of elegance to your outdoor space!
