How to sow and care for Thunbergia alata in the garden? SOIL CHOICE: Thunbergia alata tolerates all types of soil, in a warm and sheltered location. SOWING: Sow your climbing flower seeds in March-April in a heated propagator; when the seedling has 3 or 4 leaves, transplant it into a propagator. Plant out at the end of May, spacing the plants 25 cm apart. For faster germination, soak the seeds in water for 2 minutes.
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