Geraniums not flowering

Last year I bought 3  small geraniums and put them on my south facing window seat where they put on tremendous growth but never flowered.  I hard pruned them back in march this year as they were getting leggy.  The question is, how can I promote and encourage them to flower? They have also been potted on and have already put on lots of leaf growth,

I have some geraniums that I grow for their scented leaves and they have miniscule flowers. 

What did you feed them with? I use a tomato feed which mine seem to like.

Do not over water for one thing or over feed-neglect them to a certain extent-they will flower in time-it is a waiting game.

I shall be very surprised if you don't get flowers this year-all plants want to flower to set seed-that is what they are in it for.

As kate1123 says, use tomato fertilizer which is rich in potassium which encourages flowers and not leaf growth. 

well I have recently neglected them and let them dry out nicely and will start with tomato feed next month when it warms up.  thankyou.

Don't go mad on the tomato food, either - over-feeding with anything will promote lush growth at the expense of flowers. You should have had flowers last year - I'd suggest that you don't feed before you have some flowers.

Ok. Thankyou for your help.