When To Plant Dahlia Tubers Uk. They flower from midsummer through to the first frosts. Dahlia tubers need to be lifted and stored over winter after flowering.
They are summer flowering border and pot plants very versatile with high success. Plant dahlia tubers in full sun in late March or early April using a large pot and multi-purpose potting compost. For the largest of all Dahlia blooms head to our Dinner Plate Mix - a selection of decorative blooms in a mass of colours with flowers of up to 25cm diameter.
Ground temperatures should be about 60 degrees F.
2 Replies 2130 Views June 29 2007 0912 by David. Dahlia tubers need to be lifted and stored over winter after flowering. Dahlias dislike shade as well as cold wet soil and very dry sites. Plant the tuber 4 to 6 inches deep with the tuber flat and eye pointing up and place a tall stake in back of the tuber see diagram.
