Gardener's Supply Company Milky Spore 40 Oz. Milky Spore Powder is a One Time application using only one teaspoonful every 4 feet in a checker board pattern on your lawn, or use the Lawn and Garden Dispenser. Our products make it easy for you and your pets to live a greener and healthier lifestyle. For us thinking 'Green' and making a difference is a way of life. The Milky Spore is not harmful to people, animals, beneficial insects or the environment; safe to use around water ways. Grubs do damage to your lawn and attract digging vagrants such as moles and voles. Milky Spore is a naturally occurring host specific bacterium that puts a protective blanket on your lawn.