Deyu from Buffalo Grove writes
Pre-emergent applications are generally done twice a year, sometimes up to 3 times a year in some regions, in late fall and early spring. Application timing will vary from region to region, so it would be a good idea to contact your local cooperative extension office to find out the best times to apply in your area. Ferti-Lome Broadleaf Weed Control with Gallery only provides pre-emergent control. It does not control established weeds. Existing weeds should be controlled with post-emergent herbicides.
Answer last updated on: 03/10/2017