Dimension Granular Pre-Emergent Herbicide - 50 Pound. Dimension DG Pro granular pre-emergent prevent weeds it also controls early crabgrass control for immature plants. It is labeled to help prevent over 40 grass and broadleaf weeds in established turfgrasses, lawns, and landscapes. 25% of the active ingredient Dithiopyr allowing one bag to treat from 10,000 square feet up to 14,000 square feet. Weeds prevented Barnyardgrass Bluegrass Poa Annua Chickweed Crabgrass Dandelion Goosegrass Henbit Oxalis Ryegrass Spurge And many others.