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Pennant Magnum Herbicide

Pre-Emergent Weed Control for Warm-Season Turf

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Pennant Magnum herbicide, containing the active ingredient s-metolachlor, prevents yellow nutsedge, smooth and large crabgrass, and over 20 more turf, ornamental and landscape weeds from germinating on the golf course or in the landscape and is safe to ornamental plants.
Active Ingredient %
S-metolachlor 83.70 %
Other Ingredients 16.30 %
Mode of Action
Seedling Shoot Growth Inhibitors
Site of Action
(15) Long-chain Fatty Acid Inhibitor
Available on Do My Own

$236.00 / gal
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Safe On
Click on a grass type below to see safe application rates:
Bahiagrass, Bermudagrass, Centipedegrass, St. Augustinegrass, and Zoysiagrass
Not Safe On
No not safe on treatments listed. Please, review the label or contact the merchant for more information.
Maximum Yearly Limits
(1) Split rate of applications can be made at rates not less than 1 pt/A. (2) Do not apply more than once every 6 weeks. (3) For commercial sod production, do not apply more than 4.2 pt/A per year to the same area used for sod production. (4) For other turf uses, do not apply more than 2.6 pt/A per year
Time Between Applications
Do not apply more than onceevery 6 weeks.
Water Instructions
Since soil moisture is necessary to activate Pennant Magnum, irrigate with 1/2 inch of water if rainfall does not occur within 7 days after treatment.

Pennant Magnum Optimized Application Label Rate Calculator

No Control
Blanket Treatment:
Grass / Turf Types Safe
St. Augustinegrass
Jump to CertainLabel™ Pennant Magnum Label Rates & Calculator for these 5 turf types
Blanket Treatment
Label Rate:
0.48 - 0.96 fluid ounces per 1,000 sqft
Cost Effectiveness:
Covers 134031 - 268061 square feet
at a cost of
$0.88 - $1.76 per 1,000 sqft
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