A controlled-release granular fertilizer high in nitrogen describes the fertilizer that can be used for Aralia elata. The Japanese angelica tree handles time-release fertilizer applications every other month. It shows the best results in moist, well-drained soils that can be acidic, neutral or alkaline and clayey, loamy or sandy.

Not. A controlled experiment is one where there is a control - in this case what is needed is a plant which receives no extra fertilizer or water.

A controlled experiment is an experiment in which all factors are controlled except for the one variable you will be altering. If you were performing a controlled experiment on the effects of fertilizer on plant growth, for example, you have to control plant variety, exposure to sunlight, soil type and water ration. The only thing you would change is the fertilizer used on each plant.

a slow release fertilizer