Mercer Island sits in the middle of Lake Washington, so almost every street runs downhill to the water. Lots are steep, the tree canopy is old and tall, and the shoreline lots have banks that move when runoff from the street above has nowhere else to go. Weeds on a bank above the lake get pulled or replanted. We do not broadcast herbicide down a slope that sheds into the lake.
King County · ZIP 98040
No blanket spray toward the water
The upper lawn can be spot-treated for ordinary broadleaf weeds, with a buffer before the bank. Yellowing that buffer is not a success. In the lawn away from the shore, buttercup still means a wet spot, and we treat it as one.
Beds get bark and hand work. That is slower and it is the right tool next to water.
The ground in Mercer Island
Most of our work here is on slopes. A patio or terrace has to be cut into the hill with a real base and a drain behind any wall, or the first wet winter shows where the water wants to go. On the lakefront lots we keep native shrubs on the bank, because they hold the soil better than lawn, and we take runoff to a drain or a rain garden instead of letting it sheet over the edge.
The city is strict about removing large trees and about work near the shoreline. We check what needs a permit before we cut or dig, and we plan around the trees you have to keep. Under those firs and cedars the ground is shady and mossy, so we often turn worn-out lawn into planting beds and stone paths that stay clean year-round.
How we do the work
Buttercup, dandelion, and clover in a lawn usually mean the grass is thin, the soil is wet or sour, or the mowing is too short. Spray on a lawn that is mostly weed is a brown yard. We thicken the grass and treat the weeds that are actually invaders, and we tell you when the lawn should be renovated instead.
In beds, the honest tools are a thick bark layer, a pulled root, and a edge that the field cannot cross. Pre-emergent has a place on gravel and on open soil. It is not a substitute for three inches of bark in a bed that was never mulched.
What we look at first
- Which weed it is, because buttercup and horsetail are not the same job
- How much of the lawn is still grass
- Wet spots that will regrow the weed no matter what we spray
- Beds versus turf, so we are not putting a lawn product in a shrub bed
Horsetail and buttercup
Both point at water. Horsetail especially will laugh at a single spray. We can suppress it and we will tell you it returns if the seep stays. Drainage is the actual fix. We do not sell a secret jug for it.
Beds
Hand pull the perennials, three inches of bark, and an edge the mower can feel. Fabric under bark is something we spend the next visit cutting out. We do not install it as weed control.
Spot treat, do not fog
A targeted application on the weeds you can name beats a broadcast that yellows the grass and still misses the roots in a wet spot. We would rather make a second short visit than burn a lawn to get the dandelions.
More from this crew
- Lawn weed control across the region
- Lawn fertilization in Mercer Island
- Lawn aeration in Mercer Island
- Beauty bark in Mercer Island
- Lawn mowing in Mercer Island
- Lawn weed control in Sammamish
Sources for the climate and the water
- USDA plant hardiness map for choosing plants that can take a King 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.
