What To Know
- Gradually expose them to outdoor temperatures and sunlight for a few hours each day over a period of 1-2 weeks.
- Plant the delphiniums at the same level they were growing in the pots.
- Yes, you can sow delphinium seeds directly outdoors in the fall, but they may not bloom until the following year.
Delphiniums, with their towering spires of vibrant blooms, add a touch of elegance and drama to any garden. Growing these majestic plants from seeds is a rewarding endeavor that allows you to enjoy their beauty and fragrance for seasons to come. This detailed guide will provide you with step-by-step instructions on how to sow delphinium seeds successfully.
Choosing the Right Seeds
The first step is to select high-quality delphinium seeds from a reputable supplier. Look for varieties that are well-suited to your climate and soil conditions. Consider the desired bloom color, height, and flowering time when making your selection.
Preparing the Soil
Delphiniums prefer well-drained, fertile soil with a pH between 6.5 and 7.5. Amend the soil with organic matter such as compost or manure to improve its structure and fertility. Ensure good drainage by incorporating sand or perlite into the soil.
Sowing the Seeds
When to Sow: Sow delphinium seeds indoors 6-8 weeks before the last frost date in your area. You can also sow them directly outdoors in the fall, but they may not bloom until the following year.
How to Sow:
1. Fill a seed tray or pots with a well-draining seed starting mix.
2. Moisten the soil and make shallow furrows about 1/4 inch deep.
3. Scatter the seeds evenly along the furrows and lightly cover them with soil.
4. Water gently to settle the soil and keep it moist.
Germination and Care
Delphinium seeds typically germinate within 10-14 days. Keep the soil consistently moist but not soggy. Provide plenty of light, either from natural sunlight or artificial grow lights.
Temperature: Ideal germination temperature is between 65-75°F (18-24°C).
Light: Delphiniums need bright, indirect light for optimal growth.
Watering: Water regularly, allowing the soil to dry out slightly between waterings.
Transplanting Seedlings
Once the seedlings have developed their first true leaves, it’s time to transplant them into individual pots or cells. Use a well-draining potting mix and transplant the seedlings carefully, taking care not to damage the roots.
Hardening Off
Before planting delphiniums outdoors, they need to be hardened off to adjust to the outdoor conditions. Gradually expose them to outdoor temperatures and sunlight for a few hours each day over a period of 1-2 weeks.
Planting Outdoors
Choose a sunny location with well-drained soil. Dig a hole twice the width of the root ball and just as deep. Plant the delphiniums at the same level they were growing in the pots. Water deeply after planting.
Care and Maintenance
Water delphiniums regularly, especially during hot, dry weather. Fertilize them monthly with a balanced fertilizer. Deadhead spent blooms to encourage new growth and flowering. Stake tall varieties to prevent them from falling over.
Troubleshooting
Leggy Seedlings: Provide more light to prevent seedlings from becoming leggy.
Yellowing Leaves: Check for nutrient deficiencies or overwatering.
Powdery Mildew: Treat with a fungicide if necessary.
Aphids: Control aphids with insecticidal soap or neem oil.
The Bottom Line: Embrace the Beauty of Delphiniums
Growing delphiniums from seeds is a rewarding experience that allows you to enjoy their stunning blooms for years to come. By following the steps outlined in this guide, you can successfully sow, grow, and care for these magnificent plants. Let their towering spires and vibrant colors add a touch of magic to your garden.
Information You Need to Know
Q: Can I sow delphinium seeds directly outdoors?
A: Yes, you can sow delphinium seeds directly outdoors in the fall, but they may not bloom until the following year.
Q: How often should I water delphinium seedlings?
A: Water delphinium seedlings regularly, allowing the soil to dry out slightly between waterings.
Q: How tall do delphiniums grow?
A: Delphiniums can grow anywhere from 2-8 feet tall, depending on the variety.
Q: Do delphiniums bloom more than once?
A: Some delphinium varieties will bloom more than once if deadheaded after the first bloom.
Q: How can I prevent delphiniums from falling over?
A: Stake tall delphinium varieties to prevent them from falling over.
