Dahlia x hortensis (Daalia)

Dahlia is a subtropical group of very decorative plants and numerous hybrids, normally used just as one-summer flowers. The strong root must be taken up and be kept in some cool place over the winter. The you maybe have the same Dahlia once again blooming next summer. I try to get my Dahlias over the winter under some isolation material, unfortunately until now with rather poor success. But let's see.