Give them a jolt of fertilizer and they will take off!

Be careful, though that the "jolt" is not a lethal jolt....
Perhaps a small prod would be better than a jolt...
Anyhow spring sunshine and a little food should make them lush....and remember for flowering plants you need to be higher on the middle number than the first.
Linda C

Are you putting them outside during the day? As soon as I potted mine up and the daytime temps were above 50, I put them outside in the sun (hardening them off over a period of a couple days, of course). Say what you will, but indoor standard light carts or windowsills just don't produce the same kind of lush growth as exposure to direct sunlight (either outside or greenhouse). So - gently fertilize them and get them outside!!

(yea, it's kind of a pain because have to drag them in if night temps drop too low - anything below 45 and in they come for the night - but the growth realy is much lusher if they get the sun they need).

When my geraniums need more greem, I give them a feed of shultz liquid plant food. I know the middle # is still higher than the other 2. but it seems to help with the actual plant growth more than say Bloom Booster which gives me tons of buds.

Pinching could probably help too.

I agree w/Mxk3 about the work of hardening off. The more I schlep them back and forth, the more chance of breaking stems. I haven't left them outside overnight yet. I bring them into an insulated garage, and they seem pretty happy. As soon as we get some decent night temps, I'm leaving them in their chosen spots for the summer.