Gary from Wabash, Indiana writes
Dimension is best applied just before temperatures are suitable for weed seed germination. For crabgrass, this is when soil temperatures are about 55 degrees F. You will need to check your local weather forecast for a time when you will have several warm days in a row so that you can apply before that time for best results. You can usually check local soil temperatures online, too. You should not apply Dimension or other pre-emergents if the ground is frozen, if there is snow or ice on the ground, or if the ground is already saturated from rainfall.
Answer last updated on: 04/17/2018
