Also, I mow as high as my mower will go (about 4"). The lenght is about 5 days from seed at this height. I mow once a week (for the most part) and 1/2 the grass in the lawn is to seed. Is this OK or am I putting too much stress on the lawn. Should I change my mower height? I really do not have time to mow more often. Lawn appear OK otherwise.

Thank you very much for your inquiry. Once crabgrass has germinated in a lawn, the mowing height is not as effective in crabgrass control (a higher height is good for preventing other weeds from germinating, including crabgrass as plants germinate all summer) of these plants.

I looked up the products you mentioned, and there is corn gluten meal in the product. This does have pre-emergence activity on crabgrass, but in my experience this product is not fully effective if it is the primary preventer of germination (if turf is thin, not well fertilized, lots of weed seed from previous years.) This is the challenging part of ‘organic’ lawn care – the condition of your lawn before you start the process and your expectations.

A higher mowing height and not scalping your grass are always beneficial.

Again, thanks for the question and let me know if you have more.

Respectfully

Trey Rogers, The Briggs & Stratton Yard Doctor, YardDoctor.com

Thank you very much for your inquiry. I agree, a high rate of corn gluten would be appropriate.

Again, thanks for the question and let me know if you have more.

Respectfully

Trey Rogers, The Briggs & Stratton Yard Doctor, YardDoctor.com