I have 3 avocados that I started from seed in a glass of water on the window,one has 7 leaves and about 6in tall. This is the first time I have been able to make them grow so nice. Question: How do I prune it? Do I pinch off leaves at a certain height? I see on the internet that it will not give fruit unless grafted, If i wanted to try and graft it to see if it works, what age is best to try and graft it? Will having more then one around help them give fruit as well? Thanks!