Named after Karl Pehr Thunberg, a Swedish botanist. Thunbergia is grown as a house-plant, but would be better on a balcony or in a sunny porch. It is a fast growing plant that bears yellow, cream or orange flowers with black centers.
Germination Temperature (°F)
Water as often as necessary to keep compost thoroughly moist. If plant is drooping from dryness, it will quickly recover when watered.
Feed with standard liquid fertilizer every 2 weeks throughout the year.
Re-pot into a pot 2 sizes larger, maximum pot size needed is 6 inch pot.
Seeds can be grown indoors in early Spring. Just cover seeds with seed compost. They do not germinate all at once and don't discard the container until well over the time suggested.
Sow seeds in a single 3 inch pot containing moistened seed compost. Keep in a warm room in a position where they get bright filtered light and watered enough to make compost moist. Allow top half inch of compost to dry out between waterings. The new plants may be transferred to 3 inch pot and treat as mature when they grow 6 inch high. Or take 4 inch long cutting, just below a pair of leaves.
Thunbergias must have bright light when indoors. When outdoors they need 2-3 hours a day of direct sunlight to flower properly.
If you do overwinter the plant, cut it back rigorously in late Winter or early Spring.
Remove faded flowers, by pinching them out with fingertips. If this is not done regularly, the flowering season will be needlessly short.
The plant will need support if grown in a pot, but you could grow it in a hanging basket. Keep careful eye open for pests as Thunbergias seems to attract a wide selection.
Give a light spray in the evening, after a hot day, using clean water or flowers will mark.
Less than 2 percent of the insects in the world are harmful. Most are beneficial.