Core aeration
Core aeration for Kansas City lawns
Topsoil here is mostly clay. It packs down under foot traffic and tires until roots cannot get air, and no bag of fertilizer fixes that. Aeration takes the packed layer out in plugs and leaves the holes open behind it.
Core aeration is available in Missouri and Kansas.
What compacted clay does to a lawn
Johnson County Extension describes topsoil in the Kansas City area as mainly clay. Clay holds too much water when it is wet and goes brick hard in a drought. K-State says clay and silty soils are especially prone to compaction, and calls compaction a hidden stress on the root system.
Roots are about 90 percent of a grass plant and they need oxygen to work. Compaction shuts that off, and it happens shallower than most people think. Children and dogs pack the top inch. Sports and games pack two. A car parked on the grass packs three.
A core aerator answers that mechanically. Each hollow tine lifts out a plug and leaves an open hole, so water soaks in instead of running off and roots have somewhere to go. One pass helps. K-State's own number is that it takes three consecutive years of aeration for a lawn to see the full effect, which is worth knowing before you decide the first season did not do much.
When to aerate here
- SeptemberJohnson County Extension names September as the month to core aerate here. Summer stress has broken, and K-State wants at least four weeks of good growing weather after aeration, which September still has.
- March or AprilK-State lists these as the spring months for cool-season grass. It has to come before any crabgrass preventer goes down.
- Before seed, never afterThe holes are the seedbed. Seeding first wastes both.
- Once a year, twice on hard-used clayK-State wants two rounds a year on clay that gets a lot of use. Everything else is fine with one.
How a visit goes
- You point out what I cannot seeBefore the machine starts, tell me where the ground is hard, where the dog runs, and anything I need to stay off of.
- Front and back, in more than one directionJohnson County Extension asks for at least two directions so the holes land about three inches apart, and says research shows that spacing gives the greatest benefit. Packed ground gets more passes than that.
- The cores stay where they landThey look untidy for a week or two, then they crumble, drop back into the holes and carry soil into the thatch layer where the microbes that eat thatch live. Raking them up throws away half the job.
- Seed goes down the same day, if you are seedingIt lands on an opened surface instead of a mat of thatch, and the plugs crumble back over it. The holes are not the target. Seed that drops to the bottom of one is sitting deeper than it should, so what matters is the loosened top, not the depth.
- Gate closed behind me, and you hear what the plugs showedPlug depth tells you how hard the ground really is. Thin patches and a shallow root layer show up while I am pulling cores, and so does grub damage.
Before I get there
Three of these keep me from breaking something of yours. The watering one decides whether the machine does anything at all.
- Mark your sprinkler heads. Flags, marking paint, a golf tee in the ground, anything I can see from standing height. Tines go three inches down and so do heads.
- Mark the invisible dog fence, and tell me roughly where the loop runs. That wire usually sits in the same three inches.
- Water it deeply a day or two ahead, unless the sky has already done it. Too dry and the tines will not reach depth; too wet and they clog instead of dropping cores. That comes from K-State's aeration guide.
- Point out anything buried I would not guess at, like low-voltage lighting or a shallow downspout drain.
Questions I get
Do I have to rake up the plugs?
No, and I would rather you did not. They dry out, crumble and fall back into the holes, and the soil they carry breaks the thatch down. How fast they disappear depends on the weather. If you want them gone sooner, Iowa State suggests dragging a mat over the lawn to break them up.
Will it tear the lawn up?
It leaves the surface freckled with holes and plugs for a week or two. That is the whole visible effect. September growth closes it quickly, and the machine takes plugs out of the ground rather than tearing at the surface the way a power rake does.
My back gate is narrow. Is that a problem?
Tell me the width when you ask for the quote. A tight gate, a steep slope and a fully fenced back yard all change which machine comes off the trailer, and I would rather know that before I am standing in your driveway.
How hard is too hard?
Bone-dry clay lets the tines skate and pull short, broken plugs. Saturated ground smears and clogs them. Damp is what I want. If the ground is dry, water it deep a day or two out and the difference in plug depth is obvious.
Aeration and seed belong on the same day
If the lawn is thin as well as hard, the seed should go down the same day, onto the surface the tines just opened. Booked together it is one visit instead of two.
Get a quote for aeration
Send the address and a line about the lawn. I will look at the size, work out what the yard needs and send a written quote back.