Pre-Emergent Herbicide Safety Around Trees and Shrubs

Halts (Pendimethalin) and Dimension (Dithiopyr) Near Ornamentals

Applied at labeled rates, both products are safe around established trees and shrubs. No negative effects observed in professional use. However, crabgrass doesn't grow in dense shade, so application under thick canopies may be unnecessary.

Liquid vs. Granular Formulations

Dimension is available in liquid form and is a personal favorite for efficacy. Critical reminder: both liquid and granular must be watered in to move the herbicide into the soil zone where weed seeds germinate. Without irrigation/rainfall, they won't work.

Application Practicality

Granular is easier for most homeowners—uniform spreading is simpler. Liquid requires calibrated equipment and expertise to avoid skips or overlaps. Choose based on your equipment and comfort level.

Best Practice

• Apply at recommended rate.
• Water in with ½ inch irrigation within 24 hours.
• Skip dense shade zones where crabgrass won't grow anyway.