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plant image thumbnail
plant image thumbnail
plant image thumbnail
Black-eyed Susan

English Name

Thunbergia

Scientific Name

Description

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.

Africa

Origin

Acanthaceae

Family

64°F - 70°F

Germination Temperature (°F)

14 days - 21 days

Germination Period

4' - 10'

Height (feet/inches)

Maximum: 2'

Spacing (feet/inches)

Half-Hardy Annual

Life Cycle

Flower

Type

Spring, Summer & Autumn

Seasons

None

Fragrance

Colors

Watering

Water as often as necessary to keep compost thoroughly moist. If plant is drooping from dryness, it will quickly recover when watered.

Feeding

Feed with standard liquid fertilizer every 2 weeks throughout the year.

Repotting

Re-pot into a pot 2 sizes larger, maximum pot size needed is 6 inch pot.

Germination

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.

Propagation

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.

Cultivation

Thunbergias must have bright light when indoors. When outdoors they need 2-3 hours a day of direct sunlight to flower properly.

Pruning

If you do overwinter the plant, cut it back rigorously in late Winter or early Spring.

Tips

Remove faded flowers, by pinching them out with fingertips. If this is not done regularly, the flowering season will be needlessly short.

Care

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.

Humidity

Give a light spray in the evening, after a hot day, using clean water or flowers will mark.

Soil

House-plant compost.



Did you know?

Most plant cells look like little boxes full of green disks. The disks are called chloroplasts. Other organelles inside a plant cell include a nucleus (where the DNA is kept), a large central vacuole (where water and other materials are stored) and a complex internal skeleton or cytoskeleton made of various proteins.