Plectranthus is in the mint family and this species originates in rain forest in Queensland and New South Wales where it grows as an understory plant in shade. It's an excellent plant to grow in dry shady areas in the garden because, once it's established, it's very drought hardy. Plectranthus argentatus is also extremely easy to grow from cuttings. Just poke a hole in soil, insert the cutting and give it some water when it's dry and more than likely it will grow. The plant is mainly grown for its silver foliage but it has attractive racemes of white flowers in autumn which attract bees. It's supposed to be frost sensitive but if it's under shade trees they protect it anyway. After a few years' growth Plectranthus argentatus gets a little straggly and can be cut back quite hard - and you have plenty of cuttings to grow, give away or compost.