The Cape Primrose, or Streptocarpus, is a delightful, long-blooming plant.

Related to African Violets, the Cape Primrose is native to South Africa. It is only hardy in USDA Agricultural Zones 10 and higher. So for most of us, it is best used as either a houseplant or an annual.

Growing Conditions for Cape Primrose

In their native habitats, these plants are found growing in wooded mountain ravines and valleys. Therefore, they prefer similar conditions with dappled shade, cool temperatures, and some humidity.

Cape Primrose will do well in an east-facing window or on a shady patio or porch. If no east-facing window is available, a western exposure should be okay, or place near a full spectrum artificial light for 12 hours daily. They should never be placed in direct midday sun, as this scorches the leaves and flowers.

Temperatures should be kept between 55 and 75 degrees Fahrenheit for Cape Primrose to thrive. Potting soil needs to drain easily, so most store-bought potting mixes should be fine (not garden soil). Cape Primrose are shallow-rooted plants and therefore do best in containers that are wider than they are deep. They will bloom more if kept slightly root bound, so do not plant them in a container much larger than their root system. Also, their roots may attach to the pores in clay pots, so for ease of future transplanting, use a plastic or other smooth-sided container.

Watering Conditions

Overwatering is the surest way to kill Cape Primrose. They need consistent water, but the roots will rot if soil remains too soggy, so always err on the dry side with these plants.

A humidity tray would benefit Cape Primrose. Fertilize monthly with a balanced fertilizer that is high in potassium, or potash (the third number on the package will be higher, for example 5-5-8). Cut back on watering and stop feeding in winter months as the plant rests. Remove spent flowers and brown leaves as needed.