Posted: 10/04/2015 at 11:52
As nut says, give them a bit of a feed if you like but otherwise do nothing. The leaves are now feeding the bulb and next year's flower is forming inside. If you do anything unnatural to the leaves at this point, then you'll get no flowers next year. If you want to split any of the clumps of bulbs up, mark their position now with a label then split and replant them after the leaves have died.