|I have used baking soda to try and kill crabgrass in St. Augustine grass. All chemical products at Home Depot for crabgrass state:|
I am sorry for this delayed reply to your gardening question. The spring rush has brought a deluge of questions and we are working hard to catch up!
I know of no such research on baking soda. The sodium that it adds to the soil is not good for the lawn however. Crabgrass is best prevented by growing a thick dense lawn. There are preemergence products on the market to prevent weeds from germinating but they must be applied in early spring. Your County Extension Office can provide product suggestions and the proper timing for your area. After the weeds are up such as now hand pulling or just mowing are about all you can safely do.
Thanks for the question. Best wishes for a wonderful gardening season. Please stop in again soon!