Table of Contents
Starting nasturtiums from seed indoors is a great way to enjoy their vibrant blooms early in the season. These hardy annuals are easy to grow and can add bright colors to your garden or balcony. With a little preparation, you can have flowering plants ready to transplant outdoors when the weather warms.
Choosing the Right Seeds and Timing
Select high-quality nasturtium seeds from a garden center or seed supplier. For early blooms, start your seeds indoors 4 to 6 weeks before the last expected frost date in your area. Check your local frost calendar to determine the best timing for planting.
Preparing the Containers and Soil
Use shallow containers with drainage holes. Fill them with a well-draining seed-starting mix or a light potting soil. Avoid heavy soils that can retain too much moisture, which may cause seed rot.
Sowing the Seeds
Scatter the seeds on the soil surface and lightly cover them with a thin layer of soil or vermiculite. Nasturtium seeds need light to germinate, so do not plant them too deep. Keep the soil moist but not soggy.
Caring for Your Seedlings
Place the containers in a warm, bright location, such as near a south-facing window. Maintain consistent moisture and ensure good air circulation to prevent mold. Germination typically occurs within 7 to 14 days.
Transplanting Outdoors
Once the seedlings have developed two sets of true leaves and the danger of frost has passed, harden them off by gradually exposing them to outdoor conditions over a few days. Transplant them into your garden or containers, spacing them about 10-12 inches apart.
Additional Tips for Success
- Use organic, well-draining soil for transplanting.
- Water regularly but avoid overwatering.
- Fertilize lightly with a balanced liquid fertilizer every few weeks.
- Deadhead spent blooms to encourage continuous flowering.
Starting nasturtiums indoors allows you to enjoy their colorful blooms earlier and gives you a head start on your garden season. With proper care, you’ll have beautiful, edible flowers and vibrant foliage to brighten your space.