Non flowering dahlia
Hello all. Lurker/learner here with a dahlia question. Sorry for the length.
I planted a store bought tuber 3 yrs ago (I don't know the name - threw that away years ago with the package), planted it in pretty much full sun (at least what little sun San Francisco gets in summer) in a huge clay pot. It bloomed nicely year one - which happened to be one of the sunniest summers in SF I have seen in over 30 years.
In year 2, it bloomed but I could sense it was getting 'weaker' if you know what I mean. It just didn't have the same pizzazz/quantity/size. (I do NOT dig up my tubers and replant yearly) Year 2 was the WORST summer I have seen in SF also, so I thought it was the fog that may have inhibited it. Last year (yr 3) it came up real late, not all that exuberant looking and proceeded to flower from 3-4 stems but NEVER BLOOMED ONCE. (Year 3 was an average sun year). The foliage looked 'weary' or tired. Small leaves that took forever to grow only to produce NADA.
So I dug it up the other day and my goodness, the whole pot was full of tubers in 2 main clumps. There must be 30 tubers total. I know not all tubers have eyes and I do not want 30 dahlias of the same color anyway so I am going to toss the majority but any advice on why this once healthy dahlia kind of died a slow death? Only 1 -2 tubers were rotting - most were hard and looked fine. Other dahlias planted in Yr 1 are workhorses now - just this one died. I did feed em last year but with Miracle Gro (I know, my bad) though I didn't feed em in year 2.
I see no disease or thrips and I spray my dahlias anyway, so do you think it was the soil? The location? The clay pot? Not enough sun, didn't like the view, too many tubers, any ideas?