Hydrangeas not flowering
Two years ago I planted 4 macrophylla and one with reddish/purple/green leaves/red flowers (don't know what it's called) all in the same shrubby area, about 3-4 ft apart. In their first season (last summer) 3 of them had flowers, but 2 of the pink macrophylla failed to have any flowers at all. I left them alone over the winter and then in early spring (this year) I pruned the dead flowers off and lightly pruned the stems back to a set of buds. All 5 hydrangeas now have masses of lovely big leaves and flower heads forming on the same 3 that flowered last year. The two that didn't flower STILL don't have any flower heads forming. They are situated in a sheltered, part sun/part shade area with other shrubs and a Red Robin (5 years old) and a Rhodendron (ancient), but the other shrubs and plants are not crowding the hydrangeas or overhanging. I have had to lay a permeable membrane with fine slate over the area to stop neighbours' cats using it as their toilet area. However, it does get watered when it rains and I do water in dry conditions. SO, anyone any ideas why 2 hydrangeas are not flowering along with the others? (I can't provide a photo of the area as my phone doesn't have a camera and I can't download from my 'normal' camera).