This grower is sure of this plant identification.
African mallow, Cape mallow, False mallow
Anisodontea capensis (African mallow). This is a fast growing upright sub-shrub with hairy stems, which will grow about 1m. It will flower through spring into the summer with pink to dark purple flowers which are hibiscus-like, each with 5 rounded petals.
This plant needs a sheltered position, full sun and good drainage.
Grown for their flowers, containers, indoor plants.