I have done well with tubers from Lidl. The kelvin floodlight were magnificent last year. If you plant them in a tub in the greenhouse as soon as you get them, they start into growth quite easily. Next March, watch out for them. They don't hang about long enough to dry out.
The thing is to check the tubers before you buy them and don't buy the shriveled ones. Buy them early in the season so they haven't been poked about by other shoppers. Nice fat tubers are no good if they've been knocked off the stalk and if they're in a box make sure you open it before you buy it. If they look ok the cheapo ones are fine - but you may get some surprises😉
If you lift dahlias for the winter, make sure that the tubers don't get separated from the stalk part. Any that accidently break off might as well be binned/composted.
Doncaster, South Yorkshire. Soil type: sandy, well-drained
Nothing wrong with supermarket tubers, I bought some lovely ones for Wilco by internet order. as said, don’t try to separate them, they will be sold with a bit of last years stalk.
Gardening on the wild, windy west side of Dartmoor.
I have done well with tubers from Lidl. The kelvin floodlight were magnificent last year. If you plant them in a tub in the greenhouse as soon as you get them, they start into growth quite easily. Next March, watch out for them. They don't hang about long enough to dry out.
I think lidl plants are magic. I also started my dahlias early in a conservatory and took loads of cuttings with at least a 95% success rate. Some of them are as big as the plants which grew from tubers and are in flower now. I will lift the ones i grew from tuberous and just mulch the ones i grew from cuttings and see if they come back next year
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as said, don’t try to separate them, they will be sold with a bit of last years stalk.