The maple in the front yard has yellow leaves and looks terrible. I have tried to feed iron but must be doing something wrong. Thank you for your help.
Yellowing leaves generally indicates a watering issue, to much or to little.
Increase watering and adding 2 to 3 inches of hardwood mulch can help with moisture retention.
Inspect the plants for insects or fungus.
A soil test will help you determine what is missing or may be needed in the soil.
Here are a few links for you.