- 16 hours ago
Could a low-cost bag of lawn iron help tackle dandelions and clover while giving grass a greener look? This practical lawn-care guide explains the video’s iron sulfate approach, why it is presented as selective for broadleaf weeds, and why grassy weeds such as crabgrass are a different problem.
Learn about mixing and spraying precautions, application timing, possible soil acidity, and the risk of rust-colored stains on concrete, clothing, and skin. A useful overview of iron sulfate weed control, moss treatment, lawn maintenance, and safer ways to think about homemade weed remedies before treating your yard.
Learn about mixing and spraying precautions, application timing, possible soil acidity, and the risk of rust-colored stains on concrete, clothing, and skin. A useful overview of iron sulfate weed control, moss treatment, lawn maintenance, and safer ways to think about homemade weed remedies before treating your yard.
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00:00There is a bag sitting on the shelf at the hardware store right now, a plain, cheap bag that costs
00:06you $3 or $4, that you have very likely walked past a hundred times, and it will do a thing
00:12you have been paying $40 a bottle to do badly.
00:16Mix a cupful of the powder from that bag into a gallon of water, spray it over your whole lawn
00:22of a morning, and within a day or two, every dandelion and clover patch and plantain in that grass goes
00:30black and dies, while the grass itself, far from being harmed, comes up greener and thicker than it has been
00:37all season, as though you had fed it.
00:40One spraying kills the weeds and feeds the lawn at the very same time, and it costs you pennies.
00:47Now I know how that sounds, and I am not going to ask you to take it on faith. I
00:53am going to tell you exactly why it works, in plain words, and give you every warning you need to
00:59do it safe, for there are a few real ones.
01:02Stay with me, for this is one of those old cheap things that got quietly forgotten the moment someone figured
01:09out how to sell you a dearer one.
01:11Let me tell you first what the stuff is, so there is no mystery in it. It is iron. Plain
01:19iron, the same iron that is in your blood and in the rust on an old gate, dissolved into a
01:25form a plant can drink, and the full name of it is iron sulfate, though you will find it on
01:32the shelf under a humbler name.
01:33It is most often sold as a moss killer, or as lawn iron, for greening up a yellow lawn. Same
01:41mineral, different bag, different price.
01:45Groundskeepers on the golf courses have used it quiet for the better part of a hundred years, and the old
01:51folk knew iron greened a lawn long before that.
01:54There is nothing new here, and nothing strange. It is only a cheap old mineral that has been hiding in
02:01plain sight under the wrong label.
02:04I gathered the whole of it into a book at EliasYoder.com. The book is the long version. If you
02:11want it, it is there. I will not mention it again.
02:15Now, here is the why of it, the one thing that makes the whole trick work, and it is a
02:20plain difference between two kinds of plant.
02:23Think of your lawn. The grass has narrow little upright blades, thin as a needle, but a weed in that
02:31grass, your dandelion, your clover, your plantain, has wide, flat, broad leaves, spread out like open hands to catch the
02:40sun.
02:41That is the whole difference, and the iron turns it against the weed.
02:45When you spray the iron water over everything, the broad-leaved weed, with all that wide, flat surface, drinks in
02:53a great heavy dose of the iron all at once, far more than its body can handle, and it is
02:59overwhelmed and poisoned by the sheer flood of it, and in a day or two, it blackens and dies.
03:05But the grass, with its thin, narrow blade, can only take up a little sip of that same spray, for
03:12it has hardly any surface to drink with, and a little sip of iron is not a poison to the
03:18grass.
03:18It is a food. Iron is the very thing a plant uses to make itself green, so the grass takes
03:25that small dose and turns it straight into deep green color and health.
03:30The same spray, on the same morning, floods the broad weed to death and feeds the narrow grass to richness.
03:38You are not aiming at anything. You spray the whole lawn and let the plants sort themselves out by their
03:44own shape.
03:45And that is the thing that sets this apart from the other cheap killers folk reach for, so let me
03:50say a plain word on those.
03:52You have heard that boiling water kills a weed, and it does.
03:56You have heard that straight vinegar kills a weed, and it does.
04:01A handful of salt on a dandelion kills it by morning, true enough.
04:05The trouble with every one of those is that they cannot tell your weed from your grass, nor from your
04:12soil.
04:12The boiling water and the vinegar scorch the good grass right alongside the weed and leave you a brown dead
04:19patch to mend.
04:20And the salt is worse, for salt poisons the very ground so that nothing will grow there for a long
04:27while after, which is the last thing you want in a lawn.
04:31Those are fine for a weed in a crack of the pavement where you want nothing to grow at all,
04:35but in a lawn they cure the weed by wounding the grass, and that is no cure.
04:41The iron is the only one of the cheap old remedies that knows the difference, that can kill the one
04:47while feeding the other, and that is the whole reason it is worth the knowing.
04:53So let me walk you through the doing of it, plain and in order.
04:57The mix is one cup of the iron powder to one gallon of water.
05:02Stir it until the powder is clean gone and the water has turned a dark amber, no grit left in
05:09the bottom.
05:09A gallon so mixed will cover a few hundred square feet, so for an ordinary front yard, you might make
05:17up three or four gallons, and more for a bigger lawn.
05:20You put it in a simple pump sprayer, the kind that cost you a few dollars at the hardware store,
05:26not a hose-end sprayer,
05:28for with the hose-end kind, you cannot hold the strength steady, and that matters here.
05:34Set the nozzle to a fine mist, not a stream, so it settles even over the leaves like a dew,
05:41and does not run off in puddles.
05:43Then you walk the whole lawn in slow, overlapping passes, wetting everything, grass and weeds alike,
05:52for the whole point is that you need not stoop and aim at each weed one at a time.
05:57You mist the lot in ten minutes and let the difference in the plants do the sorting.
06:04That is the beauty of it, that it turns an afternoon of stooping over dandelions into a ten-minute walk.
06:11And the timing matters, so hear it.
06:14You spray in the early morning or the cool of the evening, never in the full heat of a sunny
06:20noon,
06:20for the spray needs time sitting wet on the leaf to be drunk in, and the hot sun dries it
06:27off too fast to work.
06:29The morning is best, for the dew helps it cling.
06:32And you must have a dry spell behind it, for if the rain comes within the day and washes the
06:39spray off the leaves
06:40before they have drunk it, the weeds live, and your work is wasted.
06:45So look at the sky first, and pick a dry, calm morning.
06:50Do not water the lawn for a day after, either.
06:53Give it a full day to do its work undisturbed.
06:57Within the first day, you will see the dandelion leaves curl and darken at the edges,
07:03and the clovers spot and droop, and by the second day,
07:07the broad weeds across that lawn are blackened and dead or dying,
07:12and the grass between them has gone a visible shade deeper green than it was.
07:18Not an overnight magic, but a plain, real change you can see in two days.
07:24One good spraying will handle most of the weeds in a lawn.
07:28If yours is badly overrun, and some weeds shrug off the first pass,
07:34you may give it a second spraying a couple of weeks on,
07:37but mind that three sprayings a season limit I will come to, and do not go past it.
07:44After the weeds have died and blackened, leave them be a week or two,
07:48and the dead leaves break down on their own.
07:51And here is the good part. The grass, now freed of the weeds that were crowding it
07:56and fed by the iron besides, spreads in on its own to fill the bare spots where the weeds had
08:03been,
08:04with no seeding and no patching from you.
08:07You clear the ground and feed the grass, and the grass does the rest, closing over the gaps itself.
08:15Now I must be square with you about the limits of it, for I will not sell you a wonder
08:20it cannot deliver,
08:21and this is the most important honesty in the whole business.
08:25This iron kills the broad-leaved weeds, the dandelion, the clover, the plantain, the chickweed,
08:33the creeping charlie and ground ivy, those wide-leaved invaders, and against those it is a marvel.
08:40But it will not kill a grassy weed. The crabgrass, the quackgrass, the coarse clumping grasses that invade a lawn,
08:49those have narrow blades just like your good grass, and so the iron cannot tell them apart from the lawn
08:55and will not touch them.
08:57If your trouble is crabgrass, this is not your cure,
09:01and anyone who tells you this one bag kills every weed there is, is lying to you,
09:07for it kills the broad-leaved ones and leaves the grassy ones be.
09:12But here is a bonus the label half-hides.
09:16Against moss, this iron is death itself, for moss cannot bear iron at all.
09:22If you have a damp, shady patch where the moss comes back every spring, no matter what,
09:27a single spring turns it black within hours.
09:30So know what it is for. Broad weeds and moss, yes, and wonderfully.
09:36Grassy weeds, no.
09:38Now the warnings, and these are real, so do not skip them.
09:43The first and the biggest, this iron stains, and it stains hard and fast, and more or less forever.
09:50It will put a rust-colored mark on concrete, on brick, on pavers, on the side of your house,
09:57on your clothes, and on your own skin,
09:59and those marks on hard surfaces are the devil to get off once they set.
10:04So keep your spray off the driveway and the walk and the siding,
10:09be careful at the edges of the lawn,
10:11and if some does drift onto the concrete,
10:14rinse it off that very second with water, not in a minute, in a second.
10:18Wear old clothes you do not care for,
10:21and wear gloves, for your bare hands will go orange and stay that way for days.
10:27The second warning.
10:29Keep the children and the pets and the animals off that wet lawn until it has dried,
10:34which takes a couple of hours,
10:36for while it is wet, it will stain their feet and may irritate the skin a little.
10:41Once it is dry, it is harmless enough at this strength,
10:44but wet, keep them off.
10:46And the third, do not overdo it.
10:49This iron makes the soil a little more sour, a little more acid, with every spraying.
10:55A few sprayings a season is fine and does good,
10:58but more than about three times in one year can turn your soil too sour for the grass itself to
11:04thrive,
11:04and then you have traded one trouble for another.
11:08Three times in a season is the safe most,
11:11and if you know your soil is already sour, already on the acid side,
11:16go easy or not at all, and see to the soil first.
11:19A cheap little soil test from the same hardware store will tell you where you stand.
11:25My grandfather kept the greenest lawn and the cleanest of any man I knew,
11:29and he never bought a bottle of weed killer in his life,
11:32for in his day there was hardly such a thing to buy.
11:34I remember him of a cool morning with an old pump sprayer,
11:38walking the grass slow and even,
11:40and I asked him once what was in the can,
11:43for the grass always went so deep a green after.
11:46He said it was iron, only iron,
11:48the same bag he bought for the moss on the north side of the house,
11:52and that iron was a two-edged gift,
11:54poison to the fat-leaved weeds and meat to the grass,
11:58both at once, if a man only knew how to use it.
12:01He said the trick was never in some deer bottle.
12:04The trick was in knowing the plain difference between a broad leaf and a narrow one,
12:08and letting that difference do the work.
12:11I did not understand him as a boy.
12:13I understand him now.
12:14He had the whole of it, and it cost him a few dollars a year.
12:18So let me say plainly who gains by you believing that a weed-free lawn
12:23must cost you $40 a bottle and a four-step yearly program besides.
12:27The companies that sell the bottles and the programs gain,
12:31and they gain year on year,
12:33for a yearly program is a thing you pay for again every single spring, forever.
12:38There is no money in a $3 bag of iron that you buy once or twice,
12:42and that no company can put its private stamp on.
12:45It is not that anyone schemed it so.
12:48It is only that a plain mineral off the shelf cannot be sold to you, dear,
12:52nor sold to you over and over,
12:54and a branded bottle and a subscription can.
12:57So the one is pushed hard,
12:59and the other is left sitting quiet on the bottom shelf
13:02under the Moss Killer label,
13:04waiting for someone to tell you what else it does.
13:06Now you know.
13:08Now tell me this in the comments.
13:10What weed is making your lawn look the worst this year?
13:13The dandelion?
13:14The clover?
13:15The plantain?
13:16The creeping Charlie?
13:17Name it.
13:18And I will tell you straight in the replies
13:20whether this iron will handle it
13:22or whether you have got a grassy weed
13:24that wants a different cure.
13:25And tell me as well
13:26what part of the country you are in
13:29and how your soil runs,
13:31sweet or sour,
13:33for that decides how freely you can use this.
13:37Next time, I will show you the mowing trick
13:39that grows your grass so thick and dense
13:42that the new weed seeds can find no bare ground
13:46to take root in at all,
13:48so that once you have cleaned the lawn with the iron,
13:51it stays clean on its own.
13:54For a weed killed is good,
13:57but a weed that can never get a foothold is better.
14:01But for now,
14:02do not pay $40 to do badly
14:05what $3 of iron does well.
14:08The people who built this country with their hands
14:11knew that,
14:12and we are only just starting to remember it.