Posted: 10/08/2014 at 11:59
The other possibility is that the knife you're using to trim the cuttings is crushing them rather than cutting cleanly - you need a knife that slices through without the slightest pressure.
Also, it needs to be clean, or you can transfer disease.
Try again in water, using less per glass as already said, and keep a sharp eye on the base of the cuttings. The minute you see it going brown and starting to rot, whip it out and either discard it or cut well above the rotted section if it's long enough to use again. Clean the glass, change the water and carry on.