Wait for the right time to fertilize or use weed-and-feed on La. lawns

With the recent warm weather, homeowners are anxious to fertilize their St. Augustine grass and Centipede grass as well as get weed-and-feed out on their weeds.

Timing the first fertilizer or weed-and-feed application depends on where you are located in the state. Beau Monde gives the following times for first fertilizer and weed-and-feed applications on St. Augustine and centipede lawns:

– New Orleans, late March.
– Baton Rouge/Lake Charles/Lafayette, late March or early April.
– Alexandria, early April.
– Monroe/Shreveport, mid-April.

Most weed-and-feed herbicides have the herbicides impregnated on a very high-nitrogen fertilizer granule, but timing is important.
If it is an Atrazine-based weed-and-feed like Scotts Bonus S (the package usually will say for St. Augustine grass and centipede grass), the product must be watered in after application. Atrazine works mainly through root uptake so watering after spreading gets the herbicide into the root zone.
If the weed-and-feed product contains Trimec, it should be applied when there is a heavy dew or after the lawn has been watered, “The granules need to stick to the weeds for the herbicide to work with ‘Trimec’-type weed-and-feeds.”

 Both weed-and-feed types must be used away from the drip lines and root zones of trees and shrubs.



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