Hi. I have two clematis varieties, Westerplatte and Comtesse de Bouchaud in the garden.
The Westerplatte gets around 2 hours of direct sunlight and is in a large pot in a very windy location. Its about 4 years old but has always seemed to struggle and certainly never made its 1.8m. Today I noticed it had large inky black areas on its leaves.
I looked this up on the internet and it seemed to fit clematis wilt so I followed the advice and cut the plant off at the base of the affected stems (which was all of them). I was talking to a lady I vaguely know later and she said I was possibly over-watering it and it may have been water-logged (I'd been giving it about 15 seconds worth of water any non-rain day from a watering can (sorry I have no idea how many litres this will be!).
Similarly I've been watering my Comtesse de Bouchard in a similar way which is planted directly into the ground. This has always done better but still generally suffers from mildew or dark marks on the leaves or wilting bud tips at some point in most years. I'd always put this down to its north facing location but could I be over-watering these ones as well?
Both are roughly June flowering. I'd previously heard somewhere that clematis like lots of water but is this wrong? Does anyone know the correct watering regime for these two plants? I'd be hugely grateful for any information.