Planting and overwintering dahlias?
I've always avoided dahlias because I'm sure I'll forget to dig them up in the fall.
This year, I want to try it. Not directly in the garden, but in a cement pot. My idea was to drill a few holes a few centimeters above the soil to allow rainwater to drain away, fill the lower area with chopped wood to store water, and then top with soil with the dahlia tubers. Does that make sense? And do I have to dig up dahlias in pots and treat them specially to overwinter them, or is it sufficient to put the entire pot in the basement? How far back do I need to cut everything back?
Everything I found on the internet about planting and overwintering in pots is a bit vague.
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This is only due to the fact that the water requirement is very high, because dihlias make a lot of leaf mass.
I recommend using wooden chops as drainage. Wood rots and then clogs the trigger holes. Furthermore, wood makes the earth sour, Dahlias doesn't like it at all. Use coarse split.
Let the pots dry in autumn, cut off and clean the plants above the ground. Make the dowels dark and cool and do not pour. In spring so April ended the tubers with the tubers, replant the tubers and put them in the open.
You can also take the tubers out of the dowels in autumn and store them cool and dry, but I have made myself the experience that they overwinter better in the dowel.
You can cultivate the dihlias as described.
Dahlia tubers do not suffer frost. At the beginning of October, when the above-ground parts have died through the first frost, you cut all shoots back to about 15 cm and excavate the tubers. You can store them until spring in a frost-free place, for example in the basement, but not too warm. In the case of a cement plug, I imagine this quite complicated. I'm just guessing to dig it out and cut it off.
Good luck!
Supplement: I always forget it. No, I don't forget, but put it in front of me. Yeah, you can do that. It is easier to overwinter only the tubers. If you have dihlias, you don't forget. And if so, the damage is not great.