Apply a Preemergent Herbicide
Save Your Lawn Products
Leave a bag of fertilizer or weed killer open for long and it'll soak up moisture from the air and won't go through a spreader. Even grass seed could use an extra layer of protection from a moisture-wicking concrete floor. Place opened bags of lawn products in large resealable plastic bags ($1 at discount stores). The products will be free of clumps or pests when you need them.