sallyslack.ss Posts: 6
Hi moved to my new home over a year ago, left garden to see what grew and where. 2 huge dahlias came up, dont know type but black foliage, yellow and purple flowers. Need to split them but still in ground now. Can I split them now or wait until they start to come through, or lift them later in year?
There's a guide here, you could lift and divide now and replant immediately or pot on (I think I would pot on). You'll be overflowing with plants by the sound of it, your friends and neighbours will be happy!
Sounds like you would have to actively try if you wanted to kill that massive clump, so don't worry too much.
Last year I had Dahlias successfully overwinter not in the ground, but on the ground. I didn't want them anymore so I just threw them into the border. They started shooting in April, and made new roots into the ground. (It was a mild one but they must have got frosted a couple of times).