Callous on cuttings?
I snipped some cuttings on some of my roses such as - Spice, Mrs. B. R. Cant and Mlle Franziska Krueger. I put the cuttings in water on my kitchen window sill - no direct sunshine but bright light.
In about 3 days the cuttings developed a blackened and hardened portion at the end(where i snipped them from the bush) and where the lowest leaf sets were. The top sets of leaves are green.
Is this a callous?
Now should I transfer the cuttings to potting medium ?