First, forgive me, I only started bringing home outdoor plants in the last year and a half. My Maple's leaves have started to curl and get crunchy in varying degrees, mainly at the ends of the branches and worse near the bottom of the tree. I probably didn't get the worst example with my attached photo but the worst in a few small areas is dark, curled and crunchy. When I scrape the branches near the ends it it green underneath. I bought this maple a year and a a half ago. It is 6 years old and has always been in the pot it is in now. I have kept it on our patio out of direct sun and tried to keep it out of the wind as well. We watered twice per week when it was really hot in the summer and then over the last month have been watering once per week. I wrapped the pot up for winter but a bit late as we had that one cold week. Is it watering? We just watered it yesterday. I'm so in love with this tree I'm worried. What can I do and if needed, who could I call to come and help me?