Petunia Nana Compacta
1. Materials:
- Petunia Nana Compacta seeds (check the variety for specific needs)
- Seed starting mix (light and well-draining)
- Seed trays or small pots
- Clear plastic dome or plastic wrap (to create a mini greenhouse effect)
- Grow lights (or a sunny windowsill)
2. Preparing the Seed Starting Mix
- Fill seed trays or small pots with a light, sterile seed-starting mix. Don’t use regular garden soil, as it can be too heavy and may contain pathogens.
- Moisten the soil before planting the seeds, ensuring it’s damp but not soaked.
3. Planting the Seeds
- Petunia seeds are tiny, so it’s not necessary to bury them deeply. Sprinkle them lightly on top of the soil.
- Lightly press them into the soil with your fingers or a flat board to ensure good seed-to-soil contact.
- Do not cover the seeds with soil as they require light to germinate.
4. Provide Heat and Light
- Petunia seeds need warmth (70–75°F / 21–24°C) to germinate, so keep the tray in a warm spot, or use a seedling heat mat.
- Once the seeds are planted, cover the tray with clear plastic or a dome to retain moisture and humidity.
- Petunia seeds usually take 7–10 days to germinate, though it can sometimes take a little longer.
- Once the seeds sprout, remove the cover and place the seedlings under a grow light or in a bright, sunny window. Petunias need about 12-16 hours of light per day for strong, healthy growth.
5. Thin the Seedlings
Once the seedlings are large enough to handle, thin them out, leaving the strongest ones spaced about 2 inches apart. You can transplant the extras into separate pots if you wish to grow more.
6. Transplanting to Larger Containers
As the seedlings grow, they may need to be potted up into larger containers if they become root-bound in their initial pots. Use a well-draining potting mix, and make sure each plant has enough space to develop a strong root system.
7. Harden Off the Seedlings
Before moving your petunias outside, you need to “harden them off” to acclimate them to outdoor conditions. About a week before your last frost date, start placing the seedlings outside in a sheltered spot for a few hours each day, gradually increasing the time they spend outdoors.
8. Planting Outdoors
Once the threat of frost has passed and the petunias are hardened off, you can transplant them into your garden or containers.
- Choose a sunny spot with well-drained soil.
- Space the plants about 10–12 inches apart to allow room for them to grow.
9. Ongoing Care
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- Watering: Petunias like to be watered consistently but not waterlogged. Let the soil dry out a little between waterings.
- Fertilizing: Regular feeding helps petunias thrive. Use a balanced fertilizer or a high-phosphorus fertilizer for more blooms.
- Deadheading: Remove spent flowers regularly to encourage more blooms.
- Pest control: Keep an eye out for pests like aphids or slugs, and address any issues promptly.
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