Rooibos Aspalathus linearis
Interestingly, there is only one place in the world where this plant grows naturally and this is in the Cedarberg region of north-west Cape Town. Unsurprisingly, the local communities have been using the plant to brew tea for centuries. The traditional method of harvesting this plant, involved the leaves being bruised with hammers and then being left in heaps to dry and ferment in the sun to develop its characteristically sweet and fragrant taste.
Snails hate this plant, so if you ever have any used Rooibos teabags, you can mix it into the soil where it will protect against snail attacks but also improve drainage.