Question: Is there a generalized recommendation for fertilizing ornamental trees? Answer: Abi Griffith, Horticulture Community Education Assistant In general, as long as a tree or shrub appears healthy and is growing at an acceptable rate, we don’t typically recommend fertilizing.  Hopefully the species of ornamentals have been well chosen for the site. If you are selecting trees to plant, read more Is there generalized recommendations for fertilizing ornamental trees?