How to Rewild a Quarter Acre in 18 Months

The method, step by step

1. 1

   Months 1–6

   Survey what you already have, and remove nothing

   Do not touch anything for one full growing season. This is the step people skip, and skipping it is the single most expensive decision available to you. A lawn that has been cut for twenty years still holds a seed bank, and a startling amount of what you would otherwise pay a nursery for is already in the ground waiting for the mower to stop.

   Mark the lot into a grid with stakes and string — Cowen used eight zones on his quarter acre — and walk it once a fortnight with a notebook. Record what flowers, when, and where the water sits after rain. Photograph the same three corners each visit. By August you will have a map of your own site that no guide can give you.

   Log two things carefully. Sun: mark where shade falls at nine, one and five, because meadow species want six hours minimum and most failed conversions are shade problems wearing a soil costume. And the wet spots, which are an asset rather than a defect and will decide where your best plants go.

   TipRun a soil test in month two. You are looking for pH and for excess phosphorus, which is common in old lawns and favours the exact weeds you do not want.

2. 2

   Months 5–6

   Zone the lot back to front — never front first

   This is the second thing Brandon Cowen says everyone gets in the wrong order. The instinct is to convert the front garden, because it is the part you look at and the part that would make the point. Do the opposite. Start at the back, out of sight, and let the front go last, once the rest of the lot has matured enough to read as deliberate.

   The reason is entirely social and it is not optional. A first-year meadow looks like a foreclosure. If that is the first thing your neighbours see, you will spend the next two years defending it, and in a lot of towns you will meet a nuisance-vegetation ordinance before the plants are knee high. Put the ugly phase where only you can see it.

   Draw three zones: the back plot (converted first, usually 40 to 60 per cent of the lot), the side transition (converted in the second autumn), and the front (converted last, at month 17 or later). Keep paths and sitting areas mown throughout. Cowen kept a mown circle around a bench in the back plot from day one, on the grounds that a garden nobody sits in is a project, not a garden.

3. 3

   Months 7–8

   Sheet-mulch the back plot in autumn

   Here is the first ordering mistake, and it is the costly one: people plant before the existing turf is properly dead, then spend three years fighting it. Killing turf takes one autumn if you do it correctly and never finishes if you do not.

   Mow the back plot as low as the machine will go and leave the clippings. Water the ground until it is soaked — this matters, dry cardboard does nothing. Lay plain corrugated cardboard over the whole area with a six-inch overlap at every seam, because grass finds every gap you leave. Remove all tape and plastic labels. Wet the cardboard as you go so it does not blow off, then cover it with three to four inches of arborist wood chip.

   Then leave it until spring. No stripping of turf, no rotavating, no spray. Rotavating chops perennial roots into hundreds of new plants and brings forty years of dormant weed seed to the surface; sheet mulch smothers the sward in place and hands you the decomposed organic matter as a bonus. Most tree crews will drop wood chip for nothing rather than pay to tip it.

   TipAutumn matters. Sheet mulch laid in September or October has the wet months to break down; laid in April it is a dry mat that grass grows through.

4. 4

   Months 8–9

   Source local-provenance seed while the mulch works

   Local provenance means seed grown from stock collected near you — the working definition Cowen used was within twelve miles and on similar soil. It is not fussiness. Regionally adapted stock flowers on the same schedule as the insects that need it, and a mix bought from three states away can miss the emergence window for your local bees by a fortnight, which is enough to matter.

   Buy by weight for the area you have prepared, not by the pretty photograph on the sack. A rate of roughly one pound per 1,000 square feet is right for most sown meadows; heavier sowing produces a thick first-year stand that thins out anyway and costs twice as much. Insist on a species list with percentages. A mix that will not tell you what is in it is a mix of ryegrass and hope.

   Ask for 60 to 70 per cent grasses by count — little bluestem, prairie dropseed, or the local equivalent — and the balance in forbs. Beginners buy all flowers and get a spectacular year two followed by a bare year four. The grasses are the structure that holds the whole thing up, physically and ecologically.

5. 5

   Months 10–11

   Sow into the settled mulch over winter

   Wait for the cardboard to soften and the wood chip to knit, then rake the surface open in patches rather than uniformly. You want soil contact for the seed, not a seed bed: broadcast into a rough, partly open surface, then walk the whole area or roll it. Seed needs pressing, not burying. Anything covered more than a quarter inch deep will not come up.

   Sow after the first hard frosts. Many native perennials require a cold, moist period to germinate at all, and winter sowing does that for free — no bags of damp sand in the refrigerator, no timers. Mix the seed with four parts dry sand so you can see where you have been, and sow in two passes at right angles.

   If you want anything to look established in year one, this is the moment for plug plants. Thirty to sixty plugs of three or four robust species, planted through the mulch in drifts rather than dotted about, will carry the visual load while the sown species spend their first eighteen months making roots.

   TipKeep back a tenth of the seed. You will want it in month 14 for the bare patches, and the same lot number will match.

6. 6

   Months 11–16

   The ugly phase: leave it alone

   Year one is not beautiful and is not supposed to be. Most of what comes up in the first summer is annual weed — fat hen, ragweed, whatever the site carries — because those are the species that germinate fastest on open ground. Underneath them, invisibly, the perennials you sowed are putting almost everything into root. A first-year native meadow is mostly happening below the soil line.

   The intervention people make here is to weed it, or to give up and reseed, or to water it. Do none of the three. Hand-pull only the aggressive perennials and anything on your regional invasive list; leave the annuals, which shade the seedlings, hold the soil and die out on their own by the second season. Do not irrigate beyond establishment watering for plugs, because watering selects for the shallow-rooted plants you are trying to lose. Do keep photographing the same three corners: month 14 looks like failure in person and like obvious progress in a sequence of images.

7. 7

   Months 13–17

   Mow high on a schedule, then cut the deliberate edge

   The year-two regime is the whole management plan, and it is two lines long. From the start of the second growing season, mow the meadow area to six inches roughly every four to five weeks until midsummer. This is a nursery cut, not a lawn cut: it takes the top off the annual weeds before they set seed and leaves the low perennial rosettes untouched. Set the deck as high as it goes and collect nothing.

   Stop cutting by the end of the sixth month of year two and let it stand. From that point the meadow gets one cut a year, in late winter, after the standing stems have housed a generation of stem-nesting bees and fed the birds. Cut in autumn and you remove next year’s insects along with this year’s seedheads.

   Then cut the edge, which is the cheapest and most effective thing in this guide. A mown strip 30 inches wide around every boundary that faces a road, a path or a neighbour converts the same planting from neglect into design. Keep it sharp, keep it straight, keep it short. Cowen mows his weekly in season and describes it, accurately, as the part of the garden that is for other people.

   TipA clean edge also keeps most vegetation ordinances satisfied, since they typically regulate growth within a set distance of a sidewalk rather than the interior of a lot.

8. 8

   Months 17–18

   Release the front, and then stop

   By month 17 the back plot has been through two growing seasons, the structure is visible and the thing plainly looks intentional. Now sheet-mulch the front, on exactly the same autumn schedule as step three, and run the same cycle again. The difference is that this time the neighbours have watched the back of the lot turn into something, and the conversation is a different conversation.

   Cowen went one step further and kept the front simpler than the back: fewer species, more repetition, a wider mown edge and a mown path to the door. Legibility matters most where people walk past at four miles an hour. Complexity is for the part of the garden you sit in.

   And then stop. The commonest end-state error is to keep improving a system whose entire value is that it is left alone. Once the annual cut, the mown edge and the paths are established, the correct amount of further work is close to zero: no feeding, no watering, no tidying, no topping up with a new species every spring. Eighteen months of sequence buys you a garden that costs about four hours a year. Spending more is not care. It is interference.

The whole thing on one calendar

What it costs

The method is cheap and slow, which is an unfashionable combination. Two of the largest line items are usually free: arborist crews will often drop wood chip rather than pay tipping fees, and cardboard is a phone call to any appliance shop. The one place not to economise is seed.

Cowen’s own eighteen months came in at a little over $300, most of it seed, and he is quick to point out that the number is only low because the schedule is long. “You are paying in months instead of dollars,” he said. “If you want it done in one season you can have that, and it will cost you six thousand and it will still be a lawn underneath.”

Common mistakes

• 01

  Planting before the turf is properly dead

  The number-one failure and the reason for the whole autumn-mulch step. Grass that is merely suppressed comes back through the middle of a two-year-old planting, and by then you cannot mulch it without killing everything you want.

• 02

  Starting at the front of the house

  Purely a social error, and fatal anyway. The first fourteen months look abandoned. Do that where the street can see it and you will be arguing with people instead of gardening.

• 03

  Buying all wildflowers and no grasses

  A forb-only mix gives a gorgeous second summer and a thin, weedy fourth. Native bunch grasses are the scaffolding: they hold the taller forbs upright, close the ground against invaders and carry the meadow through drought.

• 04

  Cutting everything down in autumn

  Standing stems are habitat, not mess. Cavity-nesting and stem-nesting bees overwinter in last year’s growth, and a tidy October removes them. One late-winter cut is the whole regime.

• 05

  Watering and feeding it

  Both select against the species you sowed. Native meadow plants root deep precisely because nobody irrigated them, and added fertility hands the advantage straight to fast annual weeds.

• 06

  Rotavating to “start clean”

  It chops perennial roots into hundreds of viable fragments and lifts decades of dormant weed seed into the light. Nothing about the result is clean.