Cypress trees were introduced from Europe. The African species is Widdringtonia from the Cedarberg area. These evergreen trees produce woody cones and release their allergenic pollen from June.
This indigenous tree is widely planted because it is fast-growing and economical with space. There are 74 species with diverse flowering times, so the allergenic pollen is released from October to March. Although it is insect-pollinated, the pollen is detected in air samples. The sap from this tree may cause contact dermatitis.