If rain is not expected, immediately water after the application of Scotts STEP 3 Lawn Food With 2% Iron.
Scotts Step 3 Lawn Food with 2% Iron is designed to be applied during June, July, and August. If you feel your lawn would only need two applications and only want to apply the product in June and July, that is okay as well. Per the manufacturer, just make sure you allow 4-6 weeks between applications.
As long as each product label is followed for rates and instructions there should be no issue applying Scotts STEP 3 Lawn Food With 2% Iron at the same time as Grub Ex.
Areas that are treated with Scotts STEP 3 Lawn Food With 2% Iron can be mowed 2 days after application.