Supernova (August) Supernova (August) Supernova (May) Supernova Gorgeous summer colours. £2.40 Out of stock. Tremendous summer colours with a mix of purple, red and olive/grey with amazing watermarks. The base colour is dark red in spring. Long, narrow leaves. A very attractive variety that grows well. Gustaaf van der Steen (B) 1978 Well-rooted, established plants, sent in their pots.