When To Fertilize Your Lawn. Pennington Ultragreen Lawn Fertilizer, 14 LBS.
This premium blended fertilizer is packed with essential plant nutrients to give you the thick, green lawn You desire.
It has both fast-acting nitrogen for quick greening, as well as slow-release nitrogen for extended feeding for up to 3 months. With 5% iron, this fertilizer will give you a deep, dark green lawn. Apply in the summer, Between June & August. Works best on: lawns.