Index is a town of 153 people in the Skykomish valley, tucked under steep, rocky walls. Rain comes down those walls in a hurry. Yards are small clearings, and the mountain is the neighbor on every side. Upslope, the growing season is shorter and the soil is thinner. Seed put down too late sits in the cold and washes.
Snohomish County · ZIP 98256 · 2020 population 153
A short window on thin soil
We seed the flat bench after the soil has warmed and before the fall rains are constant. Thin ground gets compost worked in, or the seed germinates and starves. Hydroseed is useful on a raw bank only if the bank is not so steep that the slurry slides. Steep cuts get plants or erosion blanket, not a lawn promise.
Mixes stay simple and tough. A showcase Kentucky bluegrass lawn is the wrong product against the timber.
The ground in Index
There is no subdivision playbook here. Access can be a single lane, the soil is thin over rock, and a “backyard” may be forty feet of level ground before the timber starts. Intense runoff is the design constraint. A wall has to be heavy enough to stay put, and a drain has to daylight somewhere that does not wash out the next switchback.
We keep planting short and native. Anything that needs summer water and a gardener will lose. Gravel and hardscape earn their place because they stay usable when the ground is soaked. Pruning and cleanup are how you keep the forest from taking the roof, the line of sight on the drive, and the ditch that is supposed to carry the runoff.
How we do the work
Seed fails here for three boring reasons: it lands on moss, it lands in the dry week of July, or it is a variety that wants a Midwest summer. We use mixes that can take cool, wet winters and our weak sun. The ground is opened first, by dethatching or cores, or the seed is just decoration.
Hydroseed makes sense on a bare area big enough to justify the tank, especially a cleared bench or a new grade. A small backyard is hand seeded or slit seeded. We say which one when we see the square footage, not from the truck.
What we look at first
- Bare soil versus a mat the seed cannot touch
- Sun hours, because no mix grows under a solid canopy
- How the water leaves the area
- Whether hydroseed or a slit seeder fits the gate and the size
Hydroseed, plainly
A slurry of seed, mulch, and tackifier, sprayed on bare soil. It holds on gentle grades better than dry seed. It still fails on a vertical bank, on moss, and on ground that is underwater. We look at those before we book the tank.
When to mow new grass
At about three inches, with a sharp blade, and not shorter than two. The first mows are slow. Turning the mower on a dime on day ten pulls the seedlings out in a clump.
The mix we actually use
Perennial rye for speed and wear, fine fescues for shade and for the wet. We do not push a bluegrass lawn that wants heat we do not get. The bag is matched to the light on that yard, not to a single recipe for the whole county.
More from this crew
- Lawn seeding across Snohomish County
- Lawn aeration in Index
- Sod installation in Index
- Lawn dethatching in Index
- Lawn fertilization in Index
- Lawn seeding in Gold Bar
- Lawn seeding in Sultan
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.
