Cause for Dahlias not blooming
I had a grouping of 10 dahlias, and 4 of them didn't bloom, and 1 got sick and had to be cut down. Of the 5 remaining that did bloom, I had to repeat blooms. Their location is out in full sun, however there is a Fir tree nearby and I was wondering if the pine cone babies that fall into their growing area could be disrupting the pH of the soil or anything like that?
They all grew tall, had buds that wanted to bloom, but it didn't happen....any input would be appreciated.