Dear maple lovers, with some good support from you last year Damage from overwatering, wind, verticillium - or all three? my potted JMs survived a sometimes harsh winter (-15°C and strong winds) well on our balcony. This spring they already did better than last year (I bought them early April 2016, each at ~10 years of age), so I was slapping my back having made no too big mistakes - but now all three of them (in individual pots, over a meter apart from each other) have a few curled leaves, maybe 10 on each plant, mostly on different twigs. All three plants developed them in the same week a week ago, while I was away. Please see the attached photos, if you can spare some time. Is this Verticillium wilt? If so, how can this disease develop in three separate potted plants? Any other suggestions as to what this symptom indicates? Thanks very much in advance!