If not, we would recommend waiting three months after the application of Tenacity Herbicide to re-seed your lawn. 69 of 75 people found this answer helpful. Regarding watering, Tenacity is rainfast within a few hours of application, so I would avoid watering within about 3 hours of post-emergent applications. A repeat application is required after two to three weeks for improved postemergence weed control. It is recommended that you wait 2-4 weeks after an application of Tenacity Herbicide to reseed with fine fescue. Application at seeding can be made to fine fescue only if it is less than 20% of a seed mixture. Other species of grass such as Bentgrass, Poa annua, kikuyugrass, zoysiagrass, seashore paspalum and bermudagrass are sensitive to Tenacity applications and damage may occur. "Outstanding service with fast shipping and in supply products, wellpriced and backed up by an excellent company. Was this answer helpful to you? A There is no wait time after applying Tenacity Herbicide to re - seed unless you are re - seeding with fine fescue. Please let us know if you have any other questions. level 1 Yes, Tenacity Herbicide can be used in the evening time. Fine fescue is the only grass seed that should not be used at the time of application. Tenacity Herbicide can be used at the time of seeding or right after for most grass types. Asked by Lea from Melbourne, Victoria, Australia. 46 of 48 people found this answer helpful. To avoid stress injury to new seedlings, do not spray after grass has germinated and until the second mow. 89 of 113 people found this answer helpful. Generally, if you are treating with Tenacity Herbicide and using a tolerant seed, the applications can be done at the same time. Generally, if you are treating with Tenacity Herbicide and using a tolerant seed, the applications can be done at the same time. * Free Shipping is available to the continental United States only. Please let us know if we can be of any more assitance. A repeat application is required after two to three weeks for improved postemergence weed control. Spread evenly across lawn. According to the product label - Residential Lawn Applications: Unless renovating and/or re-seeding the home lawn, avoid broadcast applications of Tenacity for pre and post-emergence weed control because undesirable whitening of some turfgrasses may occur. When to Use. 39 of 45 people found this answer helpful. MSMA can be effective for crabgrass control but is labeled for use only on golf courses and sod farms. After spraying with Tenacity Herbicide, the foliage of treated weeds cease growth after application, then turn white (loss of chlorophyll), and death may take up to three weeks. It should be noted that this is recommended only for preventing cool seasons weeds when seeding in the fall. Fine fescue is the only grass seed that should not be used at the time of application. There are no restrictions on fertilizing schedules. You could easily apply it every 3 or 4 monts and should be fine however per the product label regarding treating for bentgrass it states: Control of bentgrass (Agrostis spp.) Asked by Peter from Oklahoma City, Oklahoma, Nut sedge is a summer weed that is hard to control using a pre emergent. 58 of 63 people found this answer helpful. 79 of 88 people found this answer helpful. The product label states that the Tenacity acts as a pre and post emergent on bentgrass so it should help prevent it for at least a few months if you sprayed recently as a spring application. Tenacity Herbicide can be used at the time of seeding or right after for most grass types. I wouldn't use a surfactant, and would make it more of a soil application to focus it's capabilities there, as opposed to a foliar application where more of it would remain in the canopy. 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