Lithodora, recognized for its vibrant blue flowers and spreading habit, makes an appealing groundcover or rock garden perennial. Growing Lithodora from seeds is a cost-effective and rewarding endeavor. This guide details the process of growing Lithodora from seed.
Obtaining Lithodora Seeds
Acquiring Lithodora seeds typically involves purchasing them from reputable online seed suppliers or specialized garden centers. Reputable sources provide information on seed origin and viability; confirm freshness upon purchase, as older seeds have reduced germination rates.
While collecting seeds from existing Lithodora plants is possible, ensure the parent plant is a true species to prevent variations. Collect seeds after flowering when small seed pods have matured and dried. Proper storage in a cool, dry, dark place extends viability until planting.
Seed Preparation for Germination
Lithodora seeds often benefit from cold stratification to break dormancy and encourage germination. This mimics the natural cold period seeds experience outdoors, softening the seed coat and activating the embryo.
To perform cold stratification, mix seeds with a small amount of moist, sterile medium like peat moss or vermiculite. Place this mixture in a sealed plastic bag or container and refrigerate at 34-40°F (1-4°C) for 4 to 6 weeks. Ensure the medium remains consistently damp but not waterlogged to prevent mold growth.
Sowing Lithodora Seeds
After stratification, prepare a well-draining, sterile seed-starting mix, such as a blend of peat, perlite, and vermiculite. Fill shallow seed trays or individual pots with this mix, ensuring good drainage holes are present. Lightly moisten the growing medium before sowing.
Lithodora seeds are small and should be sown very shallowly, often just pressed onto the surface of moist soil. Covering them too deeply can inhibit germination, as some light is beneficial for sprouting. After sowing, gently mist the surface to settle the seeds without burying them. Maintain a consistent soil temperature, ideally between 60-70°F (15-21°C), and provide bright, indirect light for optimal germination.
Caring for Lithodora Seedlings
Once Lithodora seedlings emerge, consistent care is important. Keep the seed-starting mix consistently moist but never waterlogged, as excessive moisture can lead to damping-off disease. Watering from the bottom can help prevent disturbing delicate seedlings and maintain even moisture.
Provide plenty of bright, indirect light, either from a south-facing window or under grow lights for 12-16 hours daily. Good air circulation around seedlings helps prevent fungal issues; a small fan on a low setting can be beneficial. When seedlings develop their second set of true leaves, thin them to provide adequate space for growth, allowing the strongest seedlings to thrive. Before moving them outdoors, gradually expose seedlings to external conditions over a week or two, a process known as hardening off.
Transplanting and Initial Growth
Once Lithodora seedlings develop several true leaves and are sturdy, they are ready for transplanting. Carefully lift each seedling, minimizing disturbance to its root system, and move it to a larger individual pot or its final outdoor location. Choose a site with well-draining soil and partial to full sun exposure, ensuring the soil pH is slightly acidic for best results.
After transplanting, water seedlings gently to help settle the soil around their roots. Continue to provide consistent moisture during the initial establishment phase, especially during dry periods. Protecting young plants from extreme weather conditions, such as strong winds or intense sun, aids their successful transition and promotes robust initial growth.