growing dahlias

Dahlias originate in Mexico and they love sun and poorer soil. Excess moisture destroys the tubers, thus they should be planted in areas that drain well. Yours may not yet have bloomed owing to weather conditions. Summer began last week but in some parts of the country you would never know it owing to overcast days and rainfall. I would not expect blooms until late June, early July. Depending on the variety you planted they will be taller or shorter. Excess vegetation often means too much nitrogen in the soil. Unlike mums, they do not need to be pinched back.