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How to Sow Blue Velvet Lobelia Seeds

Neat, and compact globes of bronze foliage sit underneath a mass of delicate, dainty, deep blue flowers; ensuring an instant and attractive aesthetic for flower beds, containers, pouches, and window boxes. This versatile flower has proven to be extremely popular among gardeners, and can be utilized in a number of settings such as edging, borders and hanging baskets. Growing to a height of 6in and a spread of 12in, Blue Lobelia prefers to thrive in a sunny position in light, moist soil.

Late Winter to Spring (Indoor Start)

Start Indoors: For an early bloom, begin sowing your Lobelia seeds indoors from late winter onwards. This head start is crucial for gardeners looking to enjoy vibrant displays as soon as possible.
Temperature Control: Maintain a consistent temperature of 18-24°C (65-75°F) using a heated propagator or a warm indoor spot. The warmth is essential for germination, which typically occurs within 10-21 days.
Light and Moisture: Sow seeds on the surface of a fine seed compost, ensuring they are not covered, as Lobelia seeds need light to germinate. Keep the soil moist, using a polythene bag or clear wrap to maintain humidity if necessary.
Direct Sowing: Once the risk of frost has passed and the soil has warmed, sowing directly outdoors is feasible. This period usually begins in mid-spring to early summer.

Summer to Early Autumn (For Late Blooms)

Growing Outdoors: Plant seeds directly outdoors only when temperatures are consistently above 18 degrees.
Site Preparation: Choose a sunny spot with light, moist soil. Sow seeds thinly, without covering them, to allow for light exposure, essential for germination.
Outdoor Maintenance: Ensure plants are watered regularly, especially during dry spells, to promote healthy growth and prolonged flowering.
Succession Planting: For continuous blooms, consider sowing additional seeds in the summer. While these plants may not reach the same maturity as early sown specimens, they can still provide vibrant colour late into the season.

Growing Blue Velvet Lobelia plants from Seeds Year Round

Transplanting Seedlings: Once seedlings are sturdy enough, transplant them outdoors, spacing them about 4 inches apart. For seedlings started indoors, acclimatize them to outdoor conditions gradually over 10-15 days to prevent shock.
Continued Care: Lobelia plants require little maintenance once established. Keep the area weed-free and maintain soil moisture for optimal growth. Mulching can help retain soil moisture and temperature.
Winter Strategy: In all but the mildest UK climates, Lobelia is treated as an annual. However, to preserve seeds for the next season, allow some plants to go to seed or collect seeds from mature plants before the first frost.