My Geraniums are brown and crinkled

Can you see any bugs? If so, give them a spray. Where have you got them? Are they in the greenhouse? They may have been scorched by the sun. Too much watering would possibly have the effect of stem rot, they prefer to be a little on the dry side.

Take off the brown leaves, repot them and give them a little feed , they sound a bit starved to me ,though pelargoniums do not need too much feed or they just produce a lot of leaves and not so many flowers, I find.