I planted several bulbs of non-stop begonias that made huge plants, but no flowers. Some were in the ground and some in planters. I have always had good luck with these flowers in these locations in the past. I had to stake the plants, then after the stem got about an inch around they died. Some are showing new growth. Should I dig them up and dry them now? The bulbs were not all purchased from the same place.
I noticed you mentioned Begonia Bulbs when you started growing. Would that be the same as Tuberous Begonias? I have tuberous begonias and i use 2-7-7 Cactus liquid concentrate from Schultz following their instructions with very good results.
I hope your problem goes away soon.