Monthly Black List

Paeonia delaveyi makes it into May’s list for its tempestuous dark foliage.  For this month, just right now in the black or darkest maroon leaf palette there are some cool perennials.  Heuchera obsidian is, I think, the darkest of this genus.  Grow it with Dicentra spectabilis ‘Alba’ behind it) Anthrisus sylvestris ‘Ravenswing’ – black cowparsely (try…