Afternoon Corin, can't help you on the Dahlias, we don't have any. OB & LSA
Ditto on the dahlias. Did they get enough sun? That's my first guess as to what went wrong. Then fertilizer, water, heat.
BTW...does anybody know how to reattach metal weatherstripping to a wooden window sash?
Well ~technically~ neither do I.
I had 'em in about 5-6 different pots. Most of 'em came up. But only one bloomed. Some were in shade and some in the direct sun. So I dunno. I'm thinking I'll just throw 'em in the compost pile.
Not sure the best way to handle yer weather stripping.