How to Kill Grapevine Weeds

Apply a granule pre-emergent herbicide in a square 3 to 6 feet across around grapevine plants. The herbicide will have active ingredients such as oryzalin, napropamide, or oxyfluorfen to control annual grasses and broadleaf weeds. Water the pre-emergent herbicide with 1 to 2 inches of water to help the herbicide sink into the soil.

Dilute 2 tbsp. of nonionic surfactant in a spray tank filled with 3 to 5 gallons of water to help post-emergent herbicide stick to weeds. Nonionic surfactant is a combination of mostly petroleum distillate with alkylphenol ethoxylate.

Add herbicide to the spray tank. Perennial and annual grass foliage should be sprayed with a post-emergent herbicide containing ethoxydim, fluazifop, or clethodim. Spray weeds in the spring, when they're growing. Water stressed or dormant weeds do not absorb as much herbicide as vigorously growing weeds.

Cut a 2-liter bottle in half. Place the half with the opening over broadleaf weeds growing near mature grapevines. Spray an herbicide that contains glyphosate through the opening of the bottle to prevent contact with your grapevine.

Mow the rows between the grapevines four to eight times a year when weeds reach heights of 6 to 8 inches. Rake up weed debris to reduce the amount of seeds ready to germinate the following spring.