Notocactus warasii is a clump-forming cactus. Stunning. Yellow flowers. Easy to look after. Deservedly popular. We have a mature multi-headed plant at home in a large bowl that sits on a patio table from mid April to early September, soaking up the Sussex sunshine, annually producing lots of seed. Our plants already have between two and six heads and are outgrowing their 5.5cm pot size, so will need re-potting into a 9cm pot. Very good value and an excellent "starter" cactus.