Ice plant, a general term often used for species in the Aizoaceae family, such as the genera Delosperma and Lampranthus, is a popular choice for gardeners seeking a vibrant, drought-tolerant ground cover. These succulent plants thrive in hot, dry conditions, making them a fixture in xeriscaping and rock gardens. Understanding the appearance of their seeds is the first step toward successful cultivation.
Identifying the Appearance of Ice Plant Seeds
Ice plant seeds are minute, which is the most defining characteristic distinguishing them from larger garden seeds. They are often described as being the size of a poppy seed, making them challenging to handle without specialized tools. The seeds possess a dark coloration, typically appearing as deep brown or black specks when examined closely.
These tiny propagules usually have an irregular, rounded shape, often presenting a slight curvature, similar to a kidney or a comma. Their surface texture is generally smooth, lacking any prominent ridges or wings found on other plant seeds.
Where Ice Plant Seeds Are Found
The seeds are housed within a multi-chambered seed capsule, which develops after the showy, daisy-like flowers fade. This capsule is designed to ensure seed dispersal only when conditions are right for germination. The ice plant capsule is hygroscopic, meaning it responds directly to moisture. When the capsule is dry, it remains tightly closed, protecting the seeds from being released prematurely.
Upon contact with water, such as rain, the five segments of the capsule begin to unfold. This exposes the seed compartments, allowing the tiny seeds to be washed out and dispersed by the water current. To collect seeds, wait until the capsules on the plant are fully dried and brown, then carefully break them open to extract the seeds.
Planting and Germinating Ice Plant Seeds
Successful propagation begins with preparing a sterile, well-draining medium, such as a mix of fine potting soil and sand or perlite. The minute size of the seeds requires them to be surface-sown, meaning they should be pressed gently onto the soil surface but never covered. This is because ice plant seeds are photoblastic, possessing a requirement for light to initiate the germination process.
The planted seeds need consistent warmth, with a soil temperature around 70°F being ideal for optimal sprouting. Maintaining moisture without over-saturating the soil is important, which is best achieved by misting the surface with a spray bottle rather than heavy watering. Given the correct conditions, the tiny seedlings typically begin to emerge within two to four weeks after sowing.