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St. Johnswort Weed Killer

Hypericum perforatum Herbicide

Common Name for: Common St. Johnswort
Description of St. Johnswort (Hypericum perforatum):
Common St. Johnswort, sometimes spelled "St. John's Wort," is a perennial plant that grows between 1 and 2.5 feet tall. It has hairless, round, and light-green stems with leaves that are around 1 inch long. The upper stems have clusters of several yellow flowers and they have scattered black dots on the margins of the petals.
According to the manufacturer approved labels: The following 7 weed killers, applied at the listed application rates, will control St. Johnswort.
Pre-Emergent
Post-Emergent
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Spot Treatment
No spot treatment rates listed. Please, review the label or contact the merchant for more information.
Blanket Treatment
Label Rate:
0.11 - 0.16 fluid ounces per 1,000 sqft
Cost Effectiveness:
Covers 199131 - 278784 square feet
at a cost of
$0.34 - $0.48 per 1,000 sqft
Safe On
No safe on treatments listed. Please, review the label or contact the merchant for more information.
Pre-Emergent
Post-Emergent
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Spot Treatment
Label Rate:
5.3 fluid ounces per gallon
Cost Effectiveness:
Makes 6.038 gallons
at a cost of
$2.37 per gallon
Blanket Treatment
Label Rate:
2.94 - 5.29 fluid ounces per 1,000 sqft
Cost Effectiveness:
Covers 6050 - 10890 square feet
at a cost of
$1.31 - $2.37 per 1,000 sqft
Safe On
Annual Ryegrass, Bermudagrass, Buffalograss, Fine Fescue, Kentucky Bluegrass, Perennial Ryegrass, Red Fescue, St. Augustinegrass, and Tall Fescue
Safe Rate:
5.3 fluid ounces per gallon
or
2.94 - 5.29 fluid ounces per 1,000 sqft
CertainLabel™ Calculator for Hi-Yield 2,4-D 11.84% & these grass types
Pre-Emergent
Post-Emergent
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Spot Treatment
of
Label Rate:
0.5 - 1% mixture
Cost Effectiveness:
Makes 100 - 200 gallons
at a cost of
$0.25 - $0.51 per gallon
Blanket Treatment
Label Rate:
0.73 - 1.1 fluid ounces per 1,000 sqft
Cost Effectiveness:
Covers 116160 - 174240 square feet
at a cost of
$0.29 - $0.44 per 1,000 sqft
Safe On
No safe on treatments listed. Please, review the label or contact the merchant for more information.
Pre-Emergent
Post-Emergent
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Spot Treatment
Label Rate:
0.5 - 1 fluid ounces per gallon
Cost Effectiveness:
Makes 320 - 640 gallons
at a cost of
$0.30 - $0.61 per gallon
Blanket Treatment
Label Rate:
1.1 - 1.5 fluid ounces per 1,000 sqft
Cost Effectiveness:
Covers 213333 - 290909 square feet
at a cost of
$0.67 - $0.91 per 1,000 sqft
Safe On
Bahiagrass, Bermudagrass, Buffalograss, Centipedegrass, Tall Fescue, and Zoysiagrass
Safe Rate:
0.5 - 1 fluid ounces per gallon
or
1.1 - 1.5 fluid ounces per 1,000 sqft
CertainLabel™ Calculator for Battleship III & these grass types
Bentgrass, Chewings Fescue, Kentucky Bluegrass, Perennial Ryegrass, and Red Fescue
Safe Rate:
0.5 - 1 fluid ounces per gallon
or
1.1 - 1.5 fluid ounces per 1,000 sqft
CertainLabel™ Calculator for Battleship III & these grass types
Pre-Emergent
Post-Emergent
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Spot Treatment
Label Rate:
0.66 - 1 fluid ounces per gallon
Cost Effectiveness:
Makes 320 - 484.848 gallons
at a cost of
$0.27 - $0.41 per gallon
Blanket Treatment
Label Rate:
0.73 - 1.1 fluid ounces per 1,000 sqft
Cost Effectiveness:
Covers 290909 - 438356 square feet
at a cost of
$0.30 - $0.45 per 1,000 sqft
Safe On
No safe on treatments listed. Please, review the label or contact the merchant for more information.
Pre-Emergent
Post-Emergent
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Spot Treatment
Label Rate:
0.73 - 1.28 fluid ounces per gallon
Cost Effectiveness:
Makes 250 - 438.356 gallons
at a cost of
$0.57 - $1.01 per gallon
Blanket Treatment
Label Rate:
0.73 - 1.28 fluid ounces per 1,000 sqft
Cost Effectiveness:
Covers 250000 - 438356 square feet
at a cost of
$0.57 - $1.01 per 1,000 sqft
Safe On
Chewings Fescue, Fine Fescue, Hard Fescue, Red Fescue, and Tall Fescue
Safe Rate:
0.73 - 1.28 fluid ounces per gallon
or
0.73 - 1.28 fluid ounces per 1,000 sqft
CertainLabel™ Calculator for Sure Power Selective & these grass types
Kentucky Bluegrass and Perennial Ryegrass
Safe Rate:
0.73 - 1.28 fluid ounces per gallon
or
0.73 - 1.28 fluid ounces per 1,000 sqft
CertainLabel™ Calculator for Sure Power Selective & these grass types
Pre-Emergent
Post-Emergent
| More Info | View Label
Spot Treatment
Label Rate:
1.33 fluid ounces per gallon
Cost Effectiveness:
Makes 24.06 gallons
at a cost of
$0.90 per gallon
Blanket Treatment
Label Rate:
0.75 - 1.16 fluid ounces per 1,000 sqft
Cost Effectiveness:
Covers 27586 - 42667 square feet
at a cost of
$0.51 - $0.78 per 1,000 sqft
Instructions:
Use 0.75 to 1.16 fl. oz. of product (0.022-0.034 lb ae) per 1,000 sq. ft. per application for control of annual broadleaf weeds. Use 1.16 fl. oz. of product (0.034 lb ae) per 1,000 sq. ft per application for control of biennial and perennial broadleaf weeds.
Safe On
No safe on treatments listed. Please, review the label or contact the merchant for more information.

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