A rotting tuber and a shrivelling one look like the same disappointment in February. They need opposite corrections. Dahlia tubers are lost over winter in two opposite directions, and almost every piece of advice addresses only one of them. A clump can go soft and wet, or it can dry to a wrinkled husk — and misreading which one is happening means adding moisture to a rotting store, or sealing up one that is already too damp. Wrinkles indicate water loss, but they do not by themselves establish that the tuber is dead, which is why this guide teaches a condition check rather than a verdict. 36 pages built around the storage band most extension services agree on, a division method that keeps crown, eye and neck intact, and 13 references, 10 cited inline. The correction this guide is built on Store them around 7°C and they will be fine — it is just a number to hit. The widely used 40–50°F band, roughly 4–10°C, that Iowa State recommends is a planning band, not a cliff at which a brief reading predicts survival or death. Two things matter more than hitting an average. The store must not freeze, so a location averaging 7°C that drops below freezing on cold nights fails the requirement despite a respectable mean. And a consistently warm spot encourages early growth and can make long storage harder — so when sprouts appear in February, the room history is part of the explanation. A sprout is not automatically a disease symptom. What it answers When should I dig up dahlia tubers? What makes a dahlia division actually grow? My tubers have gone wrinkly. Are they dead? Why have my stored tubers started sprouting? How do I start stored tubers again in spring? What you get 36-page PDF, US Letter, with selectable text Reflowable EPUB for e-readers and phones — both formats, one price 4 illustrations 10 sources cited inline, every one linked (13 listed in the register) Instant download. Nothing ships. Before you buy This is an English-language digital guide. No physical materials, kit or printed book is included; anything the projects need is bought separately. The 4 interior illustrations and the cover are illustrative images. They show intent and arrangement rather than photographed results from a tested project. Published by TopDigitalKnowledge. Written by Abdelmounim El Moussaddar.