Quality of dahlia tubers

All of our dahlia tubers are size I, but what does that mean?

Something that is very dear to us is the quality of our products, and our dahlia tubers are no exception. Dahlia tubers are classified into two size groups, class I and II. Simply put, one could say that it is first and second-grade sorting.

For a dahlia tuber to be classified as size I, the tuber needs to weigh more than 80 grams, and for size II, it is over 40 grams. Does the size of the tuber matter for the size of the dahlia plant? The answer is both yes and no. The difference in a large tuber is often that it has much more vitality and can withstand conditions like dehydration for a longer time (here, of course, the storage conditions also play a significant role).

Many dahlia growers often divide the tubers to get as many class I tubers as possible, and the ones that are left become smaller tubers, thus classified as class II. It is worth mentioning, however, that if one treats a class II tuber optimally, plants it in good time, and provides the tuber with nutrients throughout the entire season, there are good chances of getting a dahlia plant at least as large as with a class I tuber.

Author: Johanna Damm

Fact-checked by Erik Hoekstra

Last updated: November 28, 2022

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