Trees will yield fruits double the size and with twice the meat if Agnihotra and Yajnya are performed regularly in the orchards. Orange would be a good fruit to begin with, as it will give quickly, almost immediate results.
More people should begin to perform Agnihotra under a tree. This makes the tree happy and the tree dances and sings. Also the birds are much attracted to Agnihotra and this heals them.