Desmodium gyrans Seeds | Chinese Telegraph Plant China
LATIN NAME: Desmodium gyrans
COMMON NAME: Telegraph Plant
Plant Profile
This page covers the same species as the telegraph plant entry, sold here as seed under its older name Desmodium gyrans. The seed is small, kidney-shaped and pale brown, and it is offered to growers who want to raise the plant from scratch rather than buy a pot.
A packet of twenty seeds, sown in late spring, will usually give a dozen plants, enough to keep a windowsill moving through the summer and to select the ones whose leaflets swing most freely. The seed keeps for two or three years in a cool, dry jar, and viability falls sharply after that.
Science & Biotechnology
Germination is limited by a hard seed coat, the same mechanism that lets legumes sit in the soil for years. Scarification is the practical answer: a few seconds against sandpaper, or a ten-minute soak in water at 60°C, lifts the germination rate from around thirty per cent to eighty or more.
Once the seedling has three true leaves, the pulvinus at the base of the lateral leaflets begins to work. The movement is fastest at 30°C and slows to nothing below about 15°C, so a cool windowsill in winter produces a plant that looks dead but is not. Seed saved from a plant that moves well does not reliably pass the trait on, since the rhythm varies between individuals and is partly environmental.
Uses & Benefits
The plant is grown for observation rather than for any product. It is used in classrooms to demonstrate turgor-driven movement, and it is a common first plant for children because the response is visible within minutes.
Seed is also sold as a novelty under names like dancing plant and semaphore plant. Buyers should know that the plant is tropical, that it needs more light than a north-facing window provides, and that it will drop its leaves if it is chilled or allowed to dry out completely. A packet sown in June will give moving plants by August, which is fast enough for a school project. Plants raised from seed flower in about twelve weeks, and the small purple flowers are worth having on their own.
Growing from Seed
Sow in spring, one seed per small pot, pressed five millimetres into a free-draining compost and kept at 25 to 30°C. Water from below to avoid rotting the seed, and expect seedlings in two to three weeks.
Grow on in bright light with steady moisture and a monthly liquid feed. Pinch the leading shoot at twenty centimetres to make a bushier plant, since unpruned seedlings become single stems. Move indoors before night temperatures fall below 12°C, and take cuttings in late summer as insurance. Seedlings are prone to damping-off, so use clean compost and let the surface dry between waterings.
Our Take
Cheap, quick and genuinely diverting from seed, so long as the packet is sown warm and the plant is never allowed to sit cold and wet.
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