The pot after potting on in a 30cm pot.
Pot of mint (before potting on) congesting its 10 cm pot and often wilts (above) and same pot originating from 3 cuttings (below)
I am fighting occasional powdery mildew attacks on these mints (also my rosemary) but if the air-flow around the pots is good, the situation should be under control. The only thing I had better improve is the garden hygiene I am practising. I rarely isolate any problematic plants nowadays and simply pinch off affected leaves. That may send a lot of invisible mildew spores scattering all over the garden. However, it is really not easy since I cannot seem to find proper locations for plant isolation.