I bought a young apricot tree last summer which was fine all summer. I planted it in a good sized pot and put it it In my in my in heated greenhouse for the winter. It has not yet got any leaves this year. The Sap is rising and a sticky dark brown sap drips from the small branches. When I rub the stem with my nail it is green. There are no imminent leaf buds. I have fed it. I don’t know if it’s dead or not. My other fruit trees planted out inthe orchard are all budding I don’t know why my apricot isn’t?