To reclaim an overgrown field, grind the brush and young trees back to open ground, then seed it and keep it mowed or grazed until the grass takes over again. A forestry mulcher does the first step in place without piles, and the seeding and mowing schedule afterward decide whether the field stays open.
How a Field Goes Back to Brush
An open field in northern Minnesota does not stay open on its own. Stop haying or grazing it and the edges creep in first. Aspen sends up suckers from the roots of trees along the woods line. Alder and willow move in on the wet ground. Birds drop buckthorn and chokecherry seed along the fences. Within a few years the field has gone from grass to a thicket you cannot walk through.
This happens on old hay ground, retired pasture and hobby farms bought from someone who stopped working them. The good news is that the soil under the brush is usually still field soil. The roots of the young trees have not been there long. That makes a grown in field easier to bring back than most owners think.
Before You Start
Decide what the field is for. Hay ground, horse pasture, a cattle paddock and a wildlife opening all end up in different shape. That decides how low the brush gets ground, how fine the mulch should be, and what comes after.
Check the wet spots. Some fields grow in with willow because the ground sits wet most of the year, and that part may be better left alone. Wetland and shoreland rules can apply to low ground and ground near water, so check with the county or your Soil and Water Conservation District first if you have any doubt. Walk the field for old fence wire, rock piles and machinery parts hidden in the brush. Mark them so they can be avoided.
Mulching Back to Open Ground
A forestry mulcher is a good fit for field reclamation. The tracked machine grinds alder, aspen, willow and buckthorn into chips right where they grew. There is no pushing brush into windrows, no burning, and nothing to haul off. The topsoil stays where it is instead of being scraped into piles along with the brush.
The work is selective. If you want to keep a shade tree for livestock, a row of spruce for a windbreak or a few oaks along the edge, they stay standing. Everything else in the field gets ground down. Our field reclamation page covers the service itself. If buckthorn is the main problem, the buckthorn removal guide explains why that shrub keeps coming back.
Seeding What You Cleared
Bare ground will not stay bare. Something grows on it, and if you do not plant grass, brush will be back first. Most owners seed the cleared field soon after the work is done. The mulch layer is usually thin enough on old field ground for seed to reach the soil, especially after a light disking or harrowing.
Frost seeding is one low cost option. University of Minnesota Extension describes it as spreading seed on the ground in late winter or early spring and letting freeze and thaw work it in. Extension notes that seed to soil contact is the key, and that legumes like red clover take most readily this way. For a full hay seeding, a farm supply, a local farmer or your Soil and Water Conservation District can help with the right mix for your soil.
The Mowing Schedule That Keeps It Open
Clearing is the big step, but follow up decides whether the field stays open. Cut aspen and willow sprout back from their roots in the first seasons after clearing. If those sprouts are left alone, they become brush again. Mowing, haying or grazing keeps cutting them down until the roots give up and the grass takes hold.
Plan on mowing the field more than once in the first growing season or two, catching sprouts while they are soft. A tractor and rotary mower handles this once the big growth is gone. After that, regular haying or grazing does the work. For more on how cut brush regrows, read do trees grow back after forestry mulching.
Hay Ground, Hobby Farms and Timing
For hay ground, the goal is a surface a mower and baler can cross. That means stems cut low, chips spread thin and any stubs that would catch equipment dealt with. For a horse or cattle pasture, the surface can be rougher, and grazing helps keep the sprouts down. A hobby farm often wants both, with hay in one field and pasture in the next.
Late fall and winter are good times to clear a field. The ground is firm, frozen wet spots can be reached, and the field is ready for frost seeding or spring planting. Calvin works all year. To get a field on the list, call or text (218) 461-7376 or ask for a free estimate and he will walk it with you.
The Short Version
- Fields grow back in from the edges with aspen, alder, willow and buckthorn.
- A mulcher grinds the brush in place and keeps the topsoil on the field.
- Seed the cleared ground soon, or brush will claim it first.
- Mow, hay or graze the sprouts in the first seasons to keep the field open.
- Check wet ground with the county or Soil and Water Conservation District.
Quick Answers
How do you clear an overgrown pasture?
Grind the brush and young trees down with a forestry mulcher, leaving any shade or windbreak trees you want. Then seed the open ground and mow or graze it often for the first seasons so sprouts do not take back over.
Will the brush grow back after reclaiming a field?
Aspen and willow sprout from their roots after cutting. Regular mowing, haying or grazing in the first seasons wears those roots down. Once grass is thick, the field holds open with normal haying or grazing.
Can I plant hay right after a field is mulched?
Often yes. On old field ground the mulch layer is usually thin enough for seed to reach soil, especially after a light disking. Frost seeding in late winter or early spring is another option Extension describes.
Is it worth reclaiming a grown in hay field?
Usually, if the soil drains and the field has a use. The ground under young brush is still field soil. Wet ground that grew in with willow may be better left, and wetland rules can apply there.
See our field reclamation service or call (218) 461-7376.