Clematis: Sowing, planting and harvest calendar
How to successfully sow clematis outdoors?
Sow ripe clematis seed as soon as you obtain it, identifying the species or parent plant. Seed from a hybrid or large-flowered cultivar does not necessarily produce identical flowers. If you want a faithful copy of a named cultivar, cuttings are more suitable. Germination varies considerably: some seeds emerge within weeks, while others take several seasons. Do not automatically discard a pot that remains empty after spring.
Use a container with drainage holes and enough depth for the first roots. Fill it with free-draining seed compost that has already been moistened, and distribute the seeds with a little space between them. Cover with a thin layer of compost, followed by grit or coarse sand. Label with the name and sowing date.
Place the pot in a cold frame or unheated greenhouse, in good light without scorching sun. For hardy species, seasonal temperature changes and winter chilling can contribute to germination. Protect the container from disturbance and keep the compost moist without leaving it constantly saturated.
Remove weeds carefully and watch for slugs. Prick out seedlings into individual pots when large enough to handle. Let them develop a good root system and guide climbing shoots before planting into their final position. The first flowers may take several years to appear.
How do you plant a clematis?
When does your clematis flower according to its group?
