How To Care For Dahlia Plants In Pots. Suspending the lamps from chains on hooks makes them easier to raise and lower. Dahlia tubers rot easily.
We use a mix of regular compost mixed with sharp sand or grit. Place a sprinkling of bone meal in the hole for a preliminary fertilizer. There are so many dahlia flower varieties that every gardener can find something for their garden.
Avoid giving it any more water unless it is very dry.
Set the lights about six inches from the tops of the pots of newly planted tubers. Dahlias with large blooms should be spaced 18 to 24 inches 46 to 61 cm apart in rows. Bring them back into growth in early April then plant out in the garden from May onwards. Dahlias need to be kept weed free.