Answer:

For most of the country Pennant Magnum would be applied in the spring and/or fall and sometimes summer, not based on when the lawn greens up.  Pre-emergents prevent weeds from germinating and growing and so if you already see weeds in your yard then it is too late to apply a pre emergent and a post emergent would be recommended.

Please view our Cool and Warm Season Lawn Care Calendar for general timing recommendations or we also recommend contacting your local cooperative extension office for the most accurate timing recommendations in your area. 

Answer last updated on: 03/09/2022