How to Grow Lobelia Seeds
Lobelia is a versatile flowering plant, known for its vibrant colors and delicate blooms. This plant thrives in garden beds and containers, making it perfect for borders, hanging baskets, and window boxes. Lobelia prefers cooler climates, growing best in areas with moderate temperatures.
Choosing a Variety of Lobelia Seeds
There are several types of lobelia to choose from. The most common varieties include the Lobelia erinus, known for its low-growing, trailing, compact form, and Lobelia speciosa (a cross between L. fulgens, L. cardinalis, and L. siphilitica) Starship variety, which boasts tall, bold blooms. Trailing varieties are excellent for containers and hanging baskets, while upright types fit well in garden beds.
When to Start Lobelia Seeds
Lobelia seeds should be started indoors about 8-12 weeks before the last frost date in your region. These seeds require a longer germination period, so starting them early ensures they’re ready for transplanting once the weather warms up.
How to Start Lobelia Seeds
To start lobelia seeds, use a seed-starting mix and gently press the tiny seeds onto the surface of the soil without covering them—lobelia seeds need light to germinate. Mist the soil to keep it moist but avoid over-watering. Place the tray in a warm, bright area, and cover it with a plastic lid or wrap to retain humidity. Seedlings typically emerge in 14-20 days.
Transplanting Lobelia Seedlings
Once the seedlings have developed a few sets of true leaves and the danger of frost has passed, harden them off by gradually introducing them to outdoor conditions. Lobelia plants are sensitive to cold, so ensure temperatures stay above 50°F. Transplant the seedlings into well-drained soil, spacing them 6-8 inches apart in a sunny to partially shaded area.
Special Considerations for Growing Lobelia Seeds
Lobelia comes in annual and perennial forms. Most varieties, such as Lobelia erinus, are annuals, offering a season of bright blooms before dying back with frost. However, some species like Lobelia speciosa are perennials in zones 6-10, returning each year with minimal care. They thrive in both full sun and partial shade but are sensitive to cold. Lobelia will require more water in sunny spots.
Growing Tips for Lobelia Seeds
To ensure your lobelia plants thrive:
- Keep the soil consistently moist, especially during hot weather.
- Fertilize lightly every 4-6 weeks with a balanced fertilizer for a continuous bloom.
- Deadheading is not required, but removing spent blooms can encourage a tidier appearance.
Pests and Problems to Watch for
Lobelia is generally low maintenance, but it can be susceptible to:
- Aphids and whiteflies. Combat these pests with insecticidal soap or a strong water spray.
- Root rot can occur in poorly drained soil, so ensure your planting site has adequate drainage.
- Watch for mildew in humid conditions; promote air circulation by avoiding overcrowded planting.
By following these tips, you’ll be well on your way to growing beautiful, healthy lobelia flowers from seeds. Whether in garden beds, containers, or hanging baskets, lobelia flowers bring vibrant color and lasting charm to your garden.
