Field Guide · 2026 Edition
Pick the weed. Match the tool. Apply it in the right order.
Most organic lawn advice fails for one reason: it treats "weeds" as a single problem. They are three. A dandelion, a mat of crabgrass, and a stand of nutsedge are different biological problems, and the product that browns clover leaves does nothing to quackgrass rhizomes. Sort the plant into the right bucket first — then the product aisle picks itself.
This page gives you the diagnostic and the match grid for free, because a wrong purchase is the most expensive part of organic weed control. The Safer Lawn Matchbook is the full 13-page field guide behind it: eight scored tools, a stacking table that tells you what you may never mix, four playbooks for specific messy yards, and a working chapter on corn gluten meal — what it does, what it will not touch, and the water sequence almost everyone skips.
Every plant in a lawn is one of three things. This single test decides which half of the store you should be standing in, and it takes about five seconds.
How you know: Wide leaves with branching, netted veins. Usually flowers.
Dandelion, white clover, creeping Charlie, plantain, chickweed, henbit, wild violet, spurge, oxalis, thistle.
Chelated iron (FeHEDTA) is the workhorse selective. It browns broadleaves and leaves cool-season turf standing. Corn gluten stops the next generation from seed.
How you know: Narrow blades, parallel veins, hollow jointed stems.
Crabgrass, goosegrass and foxtail (annuals); quackgrass, bentgrass, nimblewill, Poa annua (perennial or creeping).
Hardest category. No organic selective removes a perennial grass from inside a lawn. Annuals fall to a correctly timed pre-emergent; perennials need spot kill and reseed, renovation, or a conventional selective.
How you know: Triangular stem you can roll between two fingers. Sedges have edges.
Yellow and purple nutsedge, kyllinga. Signals wet or compacted soil.
Shrugs off almost every product sold as a "lawn weed killer." Fix the drainage and compaction first. Nothing in the organic aisle is a nutsedge specialist — spraying clover product at a triangular stem wastes a whole summer.
Read across a weed. X is a primary tool. / means partial control, seedlings only, or repeat applications required. A blank is the wrong tool for that plant — not a weaker one, the wrong one. This is the short version; the full guide scores eight tools against every category including the ones most people guess at.
| Weed | CGM | Iron | Contact | Culture | Spot |
|---|---|---|---|---|---|
| Dandelion (established) | Not applicable | Primary tool | Partial control | Primary tool | Partial control |
| Dandelion from seed | Primary tool | Partial control | Partial control | Primary tool | Not applicable |
| White clover | Partial control | Primary tool | Partial control | Primary tool | Partial control |
| Creeping Charlie | Not applicable | Partial control | Partial control | Primary tool | Partial control |
| Plantain | Not applicable | Primary tool | Partial control | Primary tool | Partial control |
| Chickweed / henbit | Primary tool | Primary tool | Partial control | Primary tool | Not applicable |
| Wild violet | Not applicable | Partial control | Partial control | Partial control | Primary tool |
| Crabgrass (not up yet) | Primary tool | Not applicable | Not applicable | Primary tool | Not applicable |
| Crabgrass (already up) | Not applicable | Not applicable | Partial control | Partial control | Primary tool |
| Quackgrass | Partial control | Not applicable | Not applicable | Not applicable | Primary tool |
| Bentgrass / nimblewill | Not applicable | Not applicable | Not applicable | Partial control | Primary tool |
| Yellow nutsedge | Not applicable | Not applicable | Not applicable | Primary tool | Partial control |
Contact organics — 20% horticultural vinegar, citrus oil, clove — brown the leaves fast and then the perennial regrows from the crown. That is why they score as partial on anything established. They are excellent on young annuals, driveway cracks, and fence lines, and they kill your grass in the same pass.
No — and this is where most organic lawn programs fail in year one. Corn gluten meal is a pre-emergent and a fertilizer. It stops a germinating seed from forming a working root. It does nothing to a plant that is already rooted. Put it on a clover-and-dandelion lawn and do nothing else, and you have mostly just fertilized the weeds.
Cornmeal, corn flour, and polenta do not carry a reliable herbicidal dose. The bag has to say corn gluten meal, typically an analysis near 9-0-0 or 10-0-0.
It must be in the top inch of soil when the target seed tries to root. For summer annuals that is when 0–2 inch soil temperature holds in the mid-50s °F — forsythia in full bloom is the classic backyard proxy. Applied in July against crabgrass, it is three months late.
The standard rate is about 20 lb of product per 1,000 sq ft. At 9–10% nitrogen that is roughly 1.8–2.0 lb of actual N per 1,000 — a substantial share of a cool-season lawn's entire annual budget. A 5,000 sq ft lawn needs 100 lb per pass. Count it or you will over-feed.
Water it in once to move the peptides to the seed zone, then allow a drying period. The seedling-kill step needs water stress on that failed root. Daily light irrigation after application is exactly how corn gluten "does nothing."
Never apply within roughly 4–6 weeks of overseeding. Seed first, get two mowings in, then resume in the next window.
Honest expectations, which cluster around a pattern rather than a miracle: year one at the correct rate and window often means 40–60% fewer new annuals, with existing perennials looking the same or greener because you fed them. Year two, 70–80% fewer new flushes if you also thickened the turf. Year three of consistent use plus culture, some yards report 90% fewer germinating weeds. Those numbers collapse if you apply at the wrong soil temperature, seed at the same time, or never deal with the perennials already in place.
Pick the weed. Match the tool. Apply it in the right order.
The Matchbook is a working field guide, not a pamphlet. It is written for a mixed U.S. home lawn — the kind with five broadleaves, a clover carpet, at least one creeping grass, and a homeowner who does not want a chemical cocktail in the yard where the dog sleeps.
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Field-guide plates for the invaders that show up in the largest number of U.S. lawns, plus a "quick ID when you do not have a picture" table that goes from what you see to the plant to the bucket in one line.
Corn gluten meal, chelated iron, contact organics, the newer dual-rate organic selectives, solarization, mesotrione, culture and overseed, and spot kill and reseed. Each card says what it is for, what it will not touch, and how it fails.
Every weed category scored against all eight tools — including the ones most guides skip, like wild violet, spurge, oxalis, Poa annua, and bindweed.
What you may combine in a season, what you may never put in one jug, and why. Iron plus vinegar in a tank is a chemistry experiment. Corn gluten plus overseeding is a wasted bag of seed. Salt and diesel are not lawn tools.
Rate math, nitrogen budgeting, regional timing windows, a seven-row mistake-and-fix table, common bag names, and an honest comparison against a synthetic pre-emergent.
Five broadleaves with good grass still in it. Creeping grasses winning. It is nutsedge. And: I want zero synthetics and I will wait a year.
Month-by-month for the cool-season map, plus a warm-season note covering the species restrictions that bite people in the South — St. Augustine and bentgrass appear as "do not apply" on more than one label.
A short fridge-list version: nobody on the lawn until the spray is dry, evening applications when flowers are present, and which product in the set is meanest on skin and eyes. (It is the 20% vinegar, not the thing you expected.)
Chelated iron (FeHEDTA) is the standard selective for clover in a lawn. Broadleaf leaves absorb it faster than turfgrass does, and the iron load becomes toxic inside the weed while cool-season grasses tolerate labeled rates. Clover usually needs two applications 2–4 weeks apart. Rust-colored staining on the turf is normal and grows out in one to two weeks.
Yes, for broadleaves: chelated iron is selective in cool-season turf. For grassy weeds, no. Nothing in the organic aisle removes crabgrass, quackgrass, or nimblewill from inside a lawn without killing the lawn with it. Contact organics like vinegar and citrus oil are non-selective by design — they kill whatever they touch.
No. Horticultural vinegar at 20% acetic acid burns off leaf tissue on contact and does not travel into a dandelion taproot or a quackgrass rhizome, so perennials regrow from the crown within weeks. It also kills grass in the spray pattern. Household 5% vinegar is weaker still. Use it for cracks, fence lines, and young annuals — not as a lawn program.
For summer annuals like crabgrass, apply when 0–2 inch soil temperature holds in the mid-50s °F — roughly April to early May in the upper Midwest and Northeast, March to April in the mid-Atlantic, late February to March in the transition zone. Forsythia in full bloom is the common proxy. For winter annuals like chickweed and henbit, apply in early fall before those seeds germinate.
No. Corn gluten meal cannot distinguish your ryegrass seed from crabgrass seed — it prevents both from rooting. Keep roughly 4–6 weeks between them. Seed first, mow the new grass twice, then resume corn gluten in the next window.
Corn gluten meal is the lowest-drama broadcast product in the set — it is a food-industry protein, and the practical hazards are dust when pouring and over-fertilizing. Chelated iron is low toxicity and people and pets typically return once the spray is dry. The universal rule for every product including the organic ones: nobody on the lawn until it is dry.
Established creeping Charlie resists most of the organic aisle. Chelated iron gives partial suppression and needs repeat applications. It thrives in shade and moisture, so the durable answer is cultural — improve light and drainage, mow high, and thicken the turf so it cannot spread by stolons. Spot kill and reseed handles a colony that will not retreat.
Not reliably. Yellow nutsedge grows from underground nutlets, regrows faster than turf after mowing, and shrugs off products sold for lawn weeds. It signals wet or compacted soil, so fixing drainage and compaction is the real treatment. Small patches can be spot-removed. The turf trade uses a sedge-specific conventional herbicide; without it you are in a multi-year cultural effort.
No, but the organic route is slower and less surgical. The three no-synthetic options are spot kill and reseed on individual islands, full solarization of the worst area during the hot weeks followed by seeding in the proper window, and relentless culture — mowing high, feeding correctly, and overseeding so the grass you want out-competes the grass you do not.
No — it is a digital PDF you download and can read on a phone in the yard or print for the shed. There is no shipping and no waiting.
The Matchbook covers weeds. The rest of this site covers insects — same principle, same refusal to reach for a broad-spectrum product first.
This guide is educational. It is not a pesticide label, not medical advice, and not a guarantee of control. Product registrations, OMRI listings, and state rules change. Read the container in your hand. State extension services remain the local last word on turf species and legal uses.