Posted: 16/07/2015 at 13:56
And the leaves of H. sphodylium are a very dull, flat green compared to H.mantegazzianum.
I used to grow the latter, it's splendid and I never had a problem but I think it's one of those things that doesn't always happen. Conditions, stage of growth of plant and maybe weather, have to be right. (or wrong).
It's like euphorbias, I've pruned, damaged, dug up and otherwise tortured many euphorbias and only be bitten once.