July 4, 2022

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Zoysia Grass: How to Overseed and Maintain It


Close up of Zoysia grass blades
Zoysia grass can be a good solution for your garden, but be confident to acquire selected treatment steps to hold brown patches from forming.

Zoysia grass is a heat-year turf from Asia built of numerous species. This coarse grass— which thrives in central and southern states — is not shade-loving and prefers the sun.

However, even with the finest treatment, drought and pest problems can lead to grass blades to flip brown or go dormant. If extensive destruction happens, and bare spots sort, overseeding zoysia grass in the fall can support restore the turf.

To that finish, here’s what makes zoysia expand patchy, how to overseed your zoysia garden, and how to make sure the best results.


Brown patches in a zoysia grass lawn
Zoysia grass can turn out to be brown and patchy if certain pests or fungi are present. (Getty Photos Signature)

What Would make Zoysia Grass Patchy?

Right before overseeding zoysia grass, you’ll need to establish the root trigger of the damage. Drought is the generally foremost variable, but pests this sort of as Chinch bugs, Hunting billbugs, and fungal pathogens like Rhizoctonia solani could also be culprits.

Here’s a breakdown of how pests and pathogens affect zoysia lawns:

Close view detail of a Chinch Bug (spilostethus pandurus)
Chinch bugs start off harmful grass from just one side and expand as populations maximize. (Getty Photographs)

Chinch Bugs

Chinch bugs — the most common pests of zoysia grass — unfold promptly to damage significant lawn parts. These bugs inflict hurt during the hot and dry summertime months, and it’s tough to distinguish their visits from drought effects. However, their patterns are predictable. Chinch bugs start out detrimental grass from one particular aspect and broaden as populations boost. As a outcome, destruction is the most intense together garden boundaries, like sidewalks and driveways.

Hunting billbug weevil feeding on a plant stem
Searching billbugs feed on plant stems and grass blades. (Getty Visuals)

Searching Billbugs

Hunting billbugs are most energetic during the night and early early morning. Their hurt is extra frequent in mid- to late spring and early summer, when billbug larvae bore into the zoysia’s decrease leaf stem and prosper. The turning point will come when rising larvae feed on stolons in the early summertime, and grass shows indications of yellow areas that inevitably brown and die out.  

Green and yellow grass texture brown patch caused by the destruction of fungus Rhizoctonia Solani grass leaf change from green to dead brown in circle lawn texture background dead dry grass
Rhizoctonia solani, a soil-borne fungal pathogen, brings about big brown patches in zoysia grass. (Getty Photos)

Rhizoctonia Solani – Fungal Pathogen

The 3rd most prevalent zoysia grass nuisance is Rhizoctonia solani, a soil-borne fungal pathogen. The huge-patch signs seem in the tumble and are most severe as zoysia grass expansion slows due to awesome temperature. This fungal pathogen can affect patches ranging from 6 inches to lots of toes in diameter.


Close up of modern gas engine grass lawn aerator
Aerate your lawn so your seeds can penetrate deeper into the soil.

How to Overseed Zoysia Grass — Uncomplicated Methods

Overseeding zoysia grass is important to protect bald lawn patches and make a wholesome garden. You really should overseed lawns in the late spring or early drop as temperatures are favorable for seed germination. If you overseed in the tumble, unfold seeds at least 60 days before the to start with frost.

To prepare a zoysia lawn for overseeding, follow these measures:

Acquire particles. The to start with step of seedbed preparing is removing particles, stones, rocks, pinecones, straws or any other ground go over. Use a rake to gather and take away lesser pieces of particles. If you’re seeding a bare place, take out any lifeless grass to expose the soil.

Mow. Reduce the grass to about 1-inch tall, guaranteeing appropriate seed-to-soil make contact with. When grass is substantial, seeds get stuck in the blades and might not achieve the soil. Maintaining small blade peak is obligatory for the profitable overseeding of zoysia grass.

Aerate. This entails punching holes into the floor to loosen compacted soil. Ample air circulation allows water to penetrate deeper to achieve roots, and aerated soils can allow for bigger seed-to-soil contact.

Dethatch. Whereas aeration prepares the soil, dethatching prepares existing turf. Thatch— consisting of lifeless grass beneath actively expanding turf — accumulates around time. It restrictions drinking water, fertilizer and grass seed from achieving the soil. Even if the lawns are mowed and aerated, really do not forget dethatching prior to overseeding zoysia.

Fertilize. Right before distributing seeds, check the soil for nutrient deficiencies and use a fertilizer based on recommendations from a soil test.

Zoysia wants extra nitrogen, very little to no phosphorous and considerably less potassium. Normally retain in brain that the ideal Zoysia grass fertilizers will have high nitrogen content. 

Distribute seeds. Zoysia wants 2 kilos of seed for every 1,000 sq. ft for exceptional overseeding. Work out the volume of seed required by dividing your garden region by the advised seeding rate. 

Normally, a hand spreader or push spreader is the very best software to unfold seed. Either one will aid make certain that seeds are dispersed uniformly, so that revived garden is equally covered.


Man fertilizing lawn soil
Fertilizing your garden will make grass blades thicker and give denser progress. (Getty Visuals)

So, you’ve overseeded your zoysia grass—now what? Below are some pointers.

  • Overseeded zoysia lawns have to have excellent moisture to sprout seed. Initially, drinking water everyday until germination. The proposed amount is 1 inch of drinking water per week, together with rainfall.
  • Keep in mind: Overwatering draws in pests to the lawn. Just take regular measurements of water for exceptional success.
  • Fertilization aids lawns prosper and indirectly aids to lessen the hazard of insect harm. Correct fertilization tends to make grass blades thick and presents denser growth. When there is a thick layer of grass above the soil surface area, insects have much less obtain to the nutrition observed in the roots of the turf, and the garden is more probable to increase insect-free.
  • Mow the overseeded garden when grass receives to a peak of 2 inches or far more. Beneath suitable problems, you will get started to see growth in 14 to 21 times.

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