But keeping them blue is a bugger. I have neutral soil, so it’s extra hard. But even if you grow them in a pot of ericaceous compost, you have to shovel in absurd quantities of aluminium sulphate – regularly – to stop them reverting to pink.
I’m failing with this one. There’s been so much rain [soilman.net 2012, passim] that the colorant is leached out of the pot almost as fast as I can pour it in.
Anyone got any tips for keeping ‘em reliably blue?
PS I’m beginning to fear the corn will fail this year. It’s SO fucking cold and wet that it’s put on pathetic growth. I can’t see it having time to fully grow, flower and form ears before the frosts.