Bests & Worsts Reviews from Amazon

***2016, 2017 and 2018 updates below*** I gave this product two stars because it hardly kills my nimbleweed (nimblewill) and bleaches treated areas (temporary). Overall, if you have a large lawn and big nimbleweed infestation, you are probably better off killing the patch with round-up and re-seeding. This will be a long review but I will try to pass what I learned and how it worked succinctly. If you want to skip the background, see the bullets below. I also attached several pictures that show the effects on your grass and weeds. I wish I could do captions. It was hard to get a good photo of all the white spots. After spending the summer laying waste to Japanese stiltgrass, I discovered nimbleweed in my lawn. I mistook it for bermuda grass. I have a 60+ year old lawn that has only been sodded in a few small areas over the years. The nimbleweed was EVERYWHERE; in the sun, in the shade... moist soil and sometimes dry soil. It had even spread into garden beds and patches of ivy. I had about 2000 sq ft of nimbleweed patches in my 13k sq ft lawn. Some areas were thick and solely nimbleweed, others were nimbleweed intertwined with the grass, all of which had spread like wildfire that year. BOTTOM LINE: Nimbleweed is very difficult to control and Tenacity requires much diligence, patience and hard work. Your lawn will look bad with bleached spots for months over a period of years but most of the nimbleweed will die and the grass will survive. 3-4 treatments is my recommendation. I also controlled a few other weeds with good or limited success as well. I also grew grass while using this as well which is pretty awesome. My treatment included two sprayings in the fall and two in the spring, each three weeks apart. Each spraying was at full strength per the directions. The syringe was helpful for both the tenacity and the surfacant and I wore nitrile gloves when mixing the concoction. I used the Bonide turbo surfacant as well and blue chalk dye (just on the first spray, it's expensive and gets used up fast). I recommend adding water last so everything mixes up nice. My sprayer is one gallon which I replaced with a two gallon after I realized how much I would have to spray. I went through 9 gallons of spray per treatment, so that is why. The hardest part of the treatments is mixing, spraying, mixing. It took awhile. Good thing, the expensive Tenacity bottle will make around 60 gallons. About 7 to 10 days after each treatment, the grass and weeds turn white. Just about every grass type I had turned white. I could tell the spray was working when the grass grew faster than the weeds. What I found interesting with the weeds in general was that not every green part on them turned white, maybe half the leaves or so at first. The bleaching peaks at about 2-3 weeks. By late fall it was cold and the nimbleweed was either dead or dormant so I stopped. I put down grass seed in between treatments and was able to save much of the lawn. A warm winter helped too. We had an early spring this year. I inspected some dead patches of nimbleweed and what I found was that the nimbleweed still rooted was coming back. I did two spring treatments, on the second treatment I mixed in some CCO to kill my wild violet that Tenacity had a marginal effect on. Knowing where to spray was easy... find the dead-looking but dormant nimbleweed. The spring treatments only needed three gallons each and the remaining nimbleweed perished as it came out of dormancy. I will probably do one or two small treatments again if I see signs of nimbleweed coming back or I want to spray my wild violet and oxalis/clover again (CCO in the mix). This product will work even if it doesn't rain and my experience is that most is absorbed through the plant's leaves. I also sprayed in 80 degree and below days. ***2016 summer update*** So about half my nimbleweed came back. I suspect this is due to me treating it after much of it seeded in September last year. On the peripheries of my lawn I have nimbleweed in garden beds and garden borders. I treated it with tenacity and have two observations: 1) necrosis is not immediate as the manufacturer suggests, it still grows, 2) it can still seed when affected by tenacity. I attached a picture of bleached nimbleweed seeding to my review. I worry it some has seeded in the lawn already but since what I noticed seed has bleached seed pods, I hope the seeds are not viable. My advice is to treat nimbleweed as soon as you see it. What seeded was treated a month or so ago. ***2017 Update*** Nimbleweed reappeared in the same spots it existed at the end of 2016. I sprayed a few spots in the back where I didn't mind my grass being white for a month. I have become frustrated and don't have the time anymore to repeatedly spray nimbleweed all over my lawn. The weed pops up from May through September so new patches emerge that whole period. Its like playing whack-a-mole. And again, three years of white spots is a lot when I want a nice lawn one day. I pulled a ton of the nimbleweed this year, the remaining patches. I will use a premergent in the spring. At this point, round-up with picking some patches then reseeding probably wouldn't taken less effort. This product continues to work incredibly well on bent grass. ***2018 Uodate*** We had a really wet spring and summer and my nimbleweed is worse than ever. The rain didn’t help but I will no longer use Tenacity. It just doesn’t work for me. The patches are in the same spots and larger. Even the bentgrass comes back. Complete success: -Crabgrass -Chickweed -Dandelion -Creeping charlie Limited success (some died, most didn't): -Nimbleweed -Clover -Oxalis -Wild violet -Loriape, (Monkeygrass), some of this creeped onto the lawn