I finally bought some dahlia tubers this summer because the flowers are so beautifully colorful. But I'm not sure exactly when I should plant them in the ground or whether I need to prepare them somehow beforehand. My neighbor says you have to store them in a cool place, but I don't know if that applies to my situation.
Dahlias do best when planted after the last frost, so depending on your region, sometime between April and May - before that it's just too cold and your tubers will rot 😊 Your neighbor's right about storage: if you still have the tubers lying around in August, you should keep them cool and dark (around 10-15°C) so they don't sprout or dry out. When it comes to actually planting them, you don't need to do much - just put them pointy side up in loose, well-draining soil, about 5-10 cm deep, and then water regularly once they start growing. Make sure they get a sunny spot, otherwise you won't get as many colorful blooms.
With me, it works best if I store the tubers for a couple of weeks before planting at a cool, dry place - that gets them to sprout, and then they take much better once it's warm enough outside. Your neighbor's right about that, but only if you've overwintered the tubers from last year; with new ones you've bought, you don't need to do that extra step, they're already prepared.
The tubers actually do need a cold period before planting to sprout properly - your neighbor's got it right 👍 I always store mine starting in February/March somewhere cool (basement or unheated room), and after 4-6 weeks you can already see little shoots. Then they go in the bed as soon as there's no more frost at night - for us that's usually mid-May. The most important thing is that you don't plant them too deep (the shoots should still be showing) and the soil is loose and well-draining, otherwise they'll really rot away.
Storing tubers before planting really makes sense - I always got the best results when I kept them in the cool cellar from late February until the first shoots showed up. Then into the ground from May on, once the frost danger is over. The important thing is storing them beforehand in a dry place, otherwise they'll get moldy on you before they even sprout. So your neighbor is absolutely right about that, a cold phase really helps the tubers get going properly.
I got dahlia tubers for the first time last year and totally messed it up at first - planted them straight in the garden in March when it was still cold, and of course they died. Since then I've done it differently and had way better results. Your neighbor is absolutely right about cool storage, that's actually the key thing. From late February or early March on, I store my tubers somewhere cool and dry (for me that's the basement), and they stay there until the first sprouts show up. That usually takes four to six weeks. This cold period basically activates the tubers and makes sure they actually shoot up properly instead of just sitting around doing nothing.
They only go in the ground once you're sure there won't be any more frost - depending on your region that's sometime between mid-April and May like I said. I always check the soil temperature, it should be at least 12 - 15 degrees. When you actually plant them: loosen the soil, don't plant too deep (two to three centimeters of soil over the tuber is enough), and don't keep them too wet the first few weeks or they'll rot on you. If your tubers are still completely dry and you're already worried about it now in September - just store them somewhere dark and cool until winter, that's totally fine.
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