Apple tree seedling
My 9 year old daughter took a seed from an apple, soaked it in water and it sprouted. That was a year ago in the spring. I planted it in a pot and left it on our deck all winter long, even through the enormous snowstorms. This May we planted it in the ground. It is now well over 6' tall and growing straight up.
Is there anything I should do to prepare it for another fall and winter? My husband said it needed pruning or something b/c it has one main branch growing straight up.