Hosta Raspberry Sorbet One of the best Hostas for flowers. Produced fairly late in summer, end of July and into August and september they are truly worth waiting for. Long tubes with an amethyst base colour, but dotted with red, and as they fade they take on strong bluish purple colours. A mature clump will produce quite a few stems of flower, and these are held above a dense clump of thick, mid green leaves that have an attractive wave to them. One of my favourites, and thoroughly recommended.