Sixty-One Raves, Nineteen Refund Requests, Barely Anyone In Between

Start with the shape of the feedback, because it tells you something before a single word is read. Of the 100 most recent reviews: 61 five-star, 9 four-star, 6 three-star, 5 two-star, 19 one-star. That U-shape is unusual. Most garden products produce a gentle slope, with a fat band of "pretty good" in the middle. Resolva Pro produces two crowds standing on opposite sides of the fence shouting at each other.

The happy crowd is emphatic. chris pinder, five stars: "This brilliant product works first time! Does just what it says on the tin. So many others I've tried have not. Highly recommend been using for several years" (sic). Neil Robertson, also five stars, used it on grass and weeds pushing through his patio: "after 2 to 3 days it had killed everything making it easier to remove". City Pigeon, another long-term buyer: "THIS WORKS! We have used this for several years and one treatment kills weeds usually first time unless it rains within an hour or so."

The unhappy crowd is just as emphatic in the other direction. One Amazon Customer at one star: "Save your money this didn't even discolour the leaves of the weed let alone kill them! Used it as per the instructions And waited a few days and still nothing. The bottle is now empty and I still have weeds!" david hands went further: "The weeds actually seemed to grow faster after this stuff was applied."

So which one is telling the truth? Both, probably. The interesting work is figuring out what is different about their gardens.

The Rain Theory Explains Some of It, But Not All of It

The obvious explanation, and the one the happy reviewers themselves reach for, is rain. This is a systemic weedkiller, meaning it needs to be absorbed through the leaf and carried down into the root system. Wash it off before it gets in and you have watered your weeds. Resolva's own listing says visible effects may be seen after 24 hours, and the satisfied buyers keep circling back to the same condition. A User, five stars: "Best weed killer but needs a couple of days of dry weather after application for it to work & it really gets rid of weeds." andrew douglas carter, who has used it for years, titled his review "make sure it is dry for a couple of days after". City Pigeon's caveat, quoted above, is the same warning in different words.

In a UK summer, that is a real constraint. You need a dry window, and "a dry window" in July can mean checking the forecast twice and going out at seven in the evening when the wind drops. Heavy, five stars, was doing exactly that, spraying mare's tail growing up between roses and perennials: "use it on a calm day as its in between roses and perennial flowers ,I can do it a bit at a time. perfect." (sic)

Here is what stops the rain theory being a complete answer. At least two of the disappointed reviewers explicitly say there was no rain. joanne gaunt, three stars: "Despite high temps no rain did not work very well, some weeds seemed to laugh it and grew quicker, was more like a feed than weed, strange really" (sic). Alex36, one star, in the same breath as the flowering dandelions: "Not had a drop of rain." Those two did the thing they were supposed to do and still got nothing.

Which points at the second variable, and it is one Resolva can't really argue away.

Four of the Five Two-Star Reviews Are About the Bottle, Not the Chemical

This is the finding that reframed the whole product for us. Count the two-star reviews in our sample and there are exactly five. Four of them have nothing to do with whether the weedkiller kills weeds. They are about the hardware.

Sally: "Cap was loose and product has leaked out. As a severe weed killer this was delivered in an unsafe state." christine carbis: "Dont know why they bother with the sprayer it never works" (sic). Jenni's bottle arrived with the spray nozzle missing altogether. And Peter Kemp, a repeat buyer who has had good results before, wrote the most useful complaint of the hundred: "Began well enough but after about 5 minutes the spray head stopped working, no spray, just a few dribbles... I will now have to decant the weed killer into a separate spray bottle to continue treatment."

Widen it out and eleven of the hundred reviews we read raise a problem with the trigger, the nozzle, the cap or the bottle itself. kevbhoy88, one star: "Gun trigger broke after about 30seconds of use" (sic). KEITH W.CROSS, one star, reckoned he'd been sent old stock and found himself "clean[ing] the filter every 30 seconds in order for the sprayer to function". Alex Bryant's arrived with no spray gun at all. Kazzygay's arrived with the top not screwed on: "Weed killer everywhere inside the plastic bag and all over my hands".

Even Emmie Loubie, who ended up giving four stars and a broadly positive write-up, docked a star purely for the applicator: "it was really hard trying to twist the nozzle into the right place to actually get it to work, my neighbour had to do it for me, and even he struggled" (sic).

Now put that next to the failure reviews. If the trigger is dribbling rather than spraying, if the filter is clogging, if the nozzle never quite locked into position, you are not applying a proper wetting dose to the leaf. You are misting it lightly and hoping. That would produce exactly what Prime describes at one star: "the edge of the leaves turned brown but that's all it did." Partial contact, partial kill, regrowth from the root. We can't prove that's what happened in every failed application, but it is a far better fit for the evidence than "the chemical is water", especially when 61 other people in the same sample watched their weeds collapse.

Patios, Drives and Gravel Are Where the Five-Star Reviews Live

Sort the raves by what people sprayed and a clear pattern shows up. Hard surfaces win. Crazydoglady: "Powerful stuff! Worked a treat on my drive". johnray: "Good for paths & driveways". The most detailed positive review in the whole batch came from an Amazon Customer doing exactly this kind of spot work: "Needed something to spot weedkill around patio, path and driveway and this has been the perfect answer... 99% of the weeds had died off within 3-4 days, including dandelions. The connected spray nozzle is great - lets you choose between a direct spray for individual weeds or a wider spray for larger patches of weeds."

It handles the tough perennial stuff too, given time and repeat visits. One buyer killed ivy with three applications. Heavy got mare's tail turning brown, which anyone who has fought that particular horror on an allotment will recognise as a small miracle. The listing claims docks, thistles, nettles, dandelions, bindweed and couch grass, and Emmie Loubie's nettles bear that out: turning brown at four days, dead about a week after that.

The disappointments cluster elsewhere. Big established dandelions in lawns come up repeatedly. Mark How, three stars: "killed off small weeds ok but on larger weeds such as dandelions it killed off a few of the leaves but then regrew." Samantha Barnard: "Killed one dandelion but the rest remains strong after several treatments." This is a non-selective systemic, so it will take your grass out along with the dandelion anyway. Spraying it into a lawn was never the right job for it, and it's worth saying plainly: if lawn weeds are your problem, buy a selective lawn weedkiller instead. Use Resolva Pro on the paving, the gravel, the fence line, the cracks by the shed, and the neglected corner you're clearing before planting.

Give It Seven Days Before You Decide It Failed

A chunk of the one-star reviews are, we suspect, impatience wearing a disguise. Nicholas: "Extra tough ! 3 days later weeds ain't even dead." Others waited "a few days" and gave up.

Compare that with the people who waited. philip behn, three stars, is grumpy but accurate: "Takes ages for it to kill weeds. 7/9 days and often 2 applications" (sic). Ali A, five stars, says the same thing cheerfully: "Takes time to effectively work but definitely kills off the weeds after a few days of waiting. So all in all 10 outta 10 for performance. However be prepared to wait a few days." anon: "Doesn't work overnight but after a week definite withering happenning" (sic). Crazydoglady titled her five-star review "Took about 7 days to totally kill weeds".

The listing's "viable result after 24 hours" promise is doing a lot of heavy lifting in creating the wrong expectation. What 24 hours buys you is a sign, some droop, a bit of yellowing at the leaf edge. What actually kills the root takes a week, sometimes two, and on thick perennial weeds it takes a second application. Systemic weedkillers work by being carried down through the plant, and that is a slow biological process, not a chemical burn. If you want brown leaves by teatime you want a contact killer, and you'll be pulling the same weeds again in a month because the roots survived.

Backrow's five-star review runs to six words and is possibly the most valuable in the set: "Top product, but read instructions carefully."

One Litre, 37 Square Metres, and Why Some Buyers Switch to Concentrate

Resolva reckons the 1L bottle covers up to 37 square metres, which the listing helpfully translates as roughly eleven car parking spaces. That is a fair amount of paving. It is not a fair amount of garden, and a few reviewers hit that wall. Rich C, three stars: "It works, rather well. My only issue, not enough to even cover a small back yard." He ended up buying the dilutable version instead and thought it was better value, and noted the weeds died quicker with it too. Emmie Loubie made the same point from the positive side: she'd buy again "but only for small areas as it does run out quickly".

That is the trade-off you accept with any ready-to-use format. You pay for water and a trigger, and you get to skip measuring, mixing and washing out a sprayer. For spot-treating a patio, a path, a gravel drive or the strip along a fence, that convenience is worth it. Mr. R. White made the point plainly, reckoning he had saved himself both the carry and the cash: "Great price, quick delivery saved me carrying, saved me money as supermarkets are selling at 11.50". Check today's price on Amazon before you buy, because it moves around through the season.

If you're clearing a whole allotment plot or a large overgrown area, buy concentrate and a pressure sprayer. Rich C already did the experiment for you.

One thing to know about the reviews: Amazon appears to pool feedback across Resolva formats and pack sizes on this listing. You'll see reviewers mentioning a £16 spend, a blue-bottle 24-hour product and the dilutable concentrate, none of which is the 1L ready-to-use bottle. Weigh those comments accordingly.

How to Actually Get a Result With It

Pulling everything the happy reviewers do together, and it is remarkably consistent:

• Check the nozzle before you start. Twist it fully into position and test-fire it at the path. If it dribbles instead of spraying, sort that out before you commit the bottle. Peter Kemp decanted his into a separate spray bottle and carried on.
• Pick a dry, calm evening. Two dry days after application is the condition the long-term users keep repeating. Rain within the hour undoes the whole job.
• Wet the leaves properly. Not a light mist. The failures read like under-application, and this is a non-selective spray, so keep it off anything you want to keep.
• Wait a full week. Then decide. Expect a second hit on thick perennials like bindweed, ivy and mare's tail.
• Keep pets off until it dries. That's a reviewer's advice, not ours: Mykee, five stars, "Keep pets away from sprayed area until dry." Read the bottle's own safety directions and follow them, as you would with any garden chemical.

Our verdict: four stars, and the missing one belongs entirely to the sprayer. The formula itself does what a systemic weedkiller should do, on the surfaces it was designed for, if you give it dry weather and a week of patience. That is not a small thing when the alternative is spending your Saturday on your knees with a hand fork. But Resolva has a hardware problem that eleven out of a hundred recent buyers ran into, and until they fix the trigger assembly, we'd suggest keeping a spare pump sprayer in the shed as insurance. Do that, and the odds you land in the 61 rather than the 19 get a lot better.

For patios, drives, gravel, fence lines and clearing rough ground before planting, this is still one of the better ready-to-use bottles on the UK market, and the repeat buyers in the reviews, several of them going back years, are the strongest signal in the whole set.