Should I de-thatch my lawn before spreading fertilizer 'with Halts' to control crabgrass? When is the proper time to put down this fertilizer? How many applications and how frequently?
The following link should answer some of your questions: http://www.scotts.com/smg/goprod/turf-builder-with-halts-crabgrass-preventer/prod100056/
You will find contact numbers at this site.
Always follow package directions.