On the Snohomish County side of Bothell the lots sit between newer housing and the Sammamish River trail. Roofs, drives, and the trail corridor move a lot of water. The soils are urban soils: graded, compacted, and quick to grow moss where the sun is weak. City lawns around here are often a cap of sod over compacted fill. Water runs off or sits in a dish. Cores are how we open that cap without tearing the yard out.
Snohomish County · ZIP 98021
Fill dirt that has been driven on for years
Construction fill does not behave like topsoil. It packs under a mower, it sheds a light rain, and it holds a heavy one in a low spot by the foundation. We core twice the first year on the worst of these, spring and early fall, then once a year if the lawn responds.
Small fenced yards mean a walk-behind, not a tractor that cannot get through the gate. We measure the gate before we promise a machine. Seed goes in the holes, not as a scattered hope across a surface that is still sealed between the plugs.
The ground in Bothell
We work the north side of the city, not a pretend second office. Yards are a mix of older ramblers and newer houses with small planting strips and a patio poured on tight fill. Runoff is the theme. A permeable patio or a short drain does more for the foundation than a wider concrete pad.
People here ask for plantings that feed birds and do not need a sprinkler all summer. That fits. Native beds along a back fence, a bark layer that is actually thick enough to suppress weeds, and a lawn that is aerated instead of constantly reseeded. Pressure washing keeps the walks and the siding from going black under the trees. The trail is a nice neighbor and a weed source. Edges need a clean line or the brush moves in.
How we do the work
We pull cores, we do not poke holes. A spike aerator squeezes the soil tighter around each puncture, which is the opposite of what a Western Washington lawn needs. Cores are about three inches, left on the grass to break apart in the rain. The visit is timed for soil that is moist enough to take the tine and dry enough that the machine does not leave ruts.
If the thatch is thicker than a finger, aerating through it only decorates the moss. Those lawns get dethatched first. Lime is a separate decision. A lot of local soil is sour, and we spread lime when the lawn shows it, not because a calendar said March.
What we look at first
- Thatch depth before we core
- Whether the ground ruts under foot
- Shade from trees that will keep the lawn thin no matter how often we aerate
- Downspouts dumping onto the same corner every winter
When we show up
The useful months are April into early June, and again in September. Midsummer cores on a dry lawn shatter and the holes collapse. January cores on saturated ground are ruts. We would rather wait a week than leave you with tracks.
What we leave behind
Plugs on the grass for a few days, then they fall apart. You can mow when they crumble. Watering is only needed if we seeded and the week turned dry, which is rare here. Stay off the soft spots until the footprints disappear.
Seed in the holes
Aeration without seed is enough when the lawn is thick and you are only relieving compaction. When you can see soil between the plants, we put seed in the openings the same day. Seed on an unaerated moss mat is bird food.
More from this crew
- Lawn aeration across Snohomish County
- Lawn dethatching in Bothell
- Lawn seeding in Bothell
- Lawn fertilization in Bothell
- Lawn mowing in Bothell
- Lawn aeration in Mill Creek
- Lawn aeration in Lynnwood
- Lawn aeration in Brier
Sources for the climate and the water
- USDA plant hardiness map for choosing plants that can take a Snohomish County winter.
- EPA WaterSense on watering less once a lawn or a new planting is established.
- EPA Soak Up the Rain on keeping roof and yard water from becoming someone else’s problem.
