I planted 3 of the allium globemasters a couple of years ago but unfortunately only one seems to want to bear a flower which is rather annoying considering they were £5 per bulb! I am unsure whether this is down to a 'duff' bulb or lack of feeding. I garden on heavy clay which I have attempted to improve by adding sharp sand, compost etc. I feed my borders religiously in the spring but then generally forget as the season gets underway. Is it worth keeping them planted to see what will happen or is there a reason why they are not flowering? Any advice would be great.