I have an original Japanese Maple in its third year in container. It is now spring in Australia and no matter what I did I always have burned tips on the maple. Although it's very minimal (pic attached), it still bothers me a little bit. The temperature has not gone above 25C (77F) so far. Every year I tried to vary the watering, less or more, thinking I might have overwater or underwater it. But still I have the burned tips. The plant receives 1.5 hours of morning sun and 1.5 hours of afternoon sun (from 3pm). Sydney can be quite windy. Last year it was so strong it toppled one of my clay containers! Could the wind be the factor here, enough to burn the leaves even though the temperature is still mild? Or is it just the reality of growing maples in containers, where the roots cannot go as deep as those grown on the ground?