I have a fertilizer that is for acid loving plants. The fertilizer's ingredients includes iron - the percentage is .325%. Is this enough for the Gardenias? Do I need to add iron? If so, I have some that is packaged as a spray using the hose. Do I need this supplement and is spraying the Gardenias ok?
Fertilizing Miniature Gardenias
Certified GKH Gardening Expert
You can use a fertilizer that is formulated for acid loving plants, but you may want to have a soil test preformed to insure the proper formulation.
Always follow the manufacturer's directions.
You can get a soil test kit from your local county extension office.
Here are some links with more information.