Mine get a little fertilizer every time the water comes on (everyone's on a timer) and of 50 different varieties, fewer than 8 have flowered. Ever. Those that have continue to do so- But those who haven't don't, no matter what I do.

Hmmm... I have put a banana peel in the pot when I repot from the original. And I have not. This year my usually big bloomer Caerulea has not set one bud. I have a micro climate going and I planted Caerulea there and in a pot... I've gotten continuous flowers from Lavendar Lady and Lady Margaret. New for me this year, Constance Elliot and Sunburst. No blooms, may be too hot, although we're experiencing a nice cool down this week. The sunburst won't have to bloom for me to be pleased, as the foliage is most unique. I guess I've been afraid to fertilize as I think it would produce more foliage and less blooms...

From what I have read, a balanced fertilizer early on is fine, but too much nitrogen will eventually lead to rampant vegetative growth with little flowering. Something high in potassium and phosphorous, but low in nitrogen will probably encourage more flowering. I have a P. 'Elizabeth' that refuses to flower. The buds form, but abort quickly. I gave it some 2-1-6 and 0-5-4 a couple of days ago, so maybe it will start flowering soon.