You usually do not need to cover grass seed, but covering it speeds germination and protects it from birds and heavy rain
Grass seed germinates without a cover. Seeds make contact with soil, absorb moisture, and sprout on their own timeline — typically 7 to 21 days depending on the grass type and temperature. A cover is optional, not required.
Covering does two things: it keeps the seed bed consistently moist (which speeds germination by a few days) and it blocks birds and wind from displacing seed. If your lawn is in a high-traffic area, near trees that drop debris, or in a windy location, a cover pays for itself. If your lawn is sheltered and you water regularly, you can skip it.
The most common covers are straw, erosion control blankets, and burlap. Each has a different cost, effort level, and removal process. Your choice depends on your lawn size, budget, and how much time you want to spend on cleanup.
Key Takeaways
- Grass seed germinates without any cover; covering is a choice that speeds results and reduces losses, not a requirement.
- Straw is cheap and widely available but requires raking out after germination and can introduce weed seeds if not weed-free straw.
- Erosion control blankets (biodegradable mesh) stay in place better than straw in wind and rain but cost more upfront.
- Burlap works well for small areas and slopes but demands manual labor to lay and remove.
- Consistent watering matters more than covering; a bare seed bed kept moist germinates faster than a dry covered one.
Straw: the cheapest option with the most cleanup
Straw is the most popular cover because it is inexpensive — typically $3 to $8 per bale — and available at garden centers and hardware stores. Spread it 1/4 inch thick over the seed bed so you can still see soil underneath. Too thick and it blocks light and traps moisture that causes mold.
The downside is removal. Once grass is 2 to 3 inches tall, you rake out the straw. This takes time on large lawns and can disturb young seedlings if you are not careful. Buy weed-free straw, not hay — hay contains seeds that will sprout as weeds in your lawn. Check the label or ask the seller; weed-free straw costs slightly more but saves you months of pulling.
Straw works best on small to medium lawns (under 2,000 square feet) where raking is manageable. On larger areas, the labor cost often outweighs the material savings.
Erosion control blankets: set it and mostly forget it
Erosion control blankets (also called coir blankets or coconut fiber blankets) are biodegradable mesh sheets that hold seed in place and retain moisture. They cost $0.15 to $0.40 per square foot, so a 1,000-square-foot lawn runs $150 to $400. They are more expensive than straw but require far less labor.
Lay the blanket over the seeded area, overlap the edges by 6 inches, and pin or stake it down. Water normally — water passes through the mesh. The blanket breaks down naturally over 6 to 12 months as grass grows, so you do not rake it out. This makes it ideal for large lawns, slopes, or areas where you do not want to return for cleanup.
The trade-off is upfront cost and the need to order online or special-order from a garden center. Some blankets are thicker and more durable than others; read reviews before buying. Cheaper versions tear easily during installation or wash away in heavy rain.
Burlap: the best choice for slopes and small spaces
Burlap is a natural fabric that holds seed and soil in place on slopes where water and wind would otherwise wash everything away. It is also the best option for small repair patches (under 200 square feet) because you can cut it to fit exactly and remove it by hand.
Lay burlap over the seeded area and weight it down with landscape staples, rocks, or soil along the edges. Water through the burlap — it is porous. Once grass is 2 to 3 inches tall, roll it up and remove it. Burlap costs $0.10 to $0.20 per square foot, making it cheaper than blankets but more labor-intensive than straw.
Burlap is less practical for large flat lawns because it requires manual placement and removal, and it can shift in wind if not weighted heavily. It works best where you need precision and do not mind the hands-on work.
When covering actually matters
Cover your seed if birds are a problem in your area, if you live somewhere windy, or if heavy rain is forecast within the first week. Uncovered seed in these conditions can be displaced or washed away before it germinates. A cover keeps seed in contact with soil where it belongs.
Cover also matters on slopes steeper than 10 degrees. Bare seed on a slope washes downhill in rain; a cover holds it in place. If your lawn is flat, sheltered, and you do not have a bird problem, you can skip covering and save the cost and labor.
Watering consistency matters more than covering. A bare seed bed watered twice daily germinates faster than a covered, dry one. If you can water regularly (or have an irrigation system), you do not need a cover. If you cannot water daily, a cover keeps the seed bed moist longer between waterings.
Removing cover without damaging seedlings
Remove straw when grass reaches 2 to 3 inches tall — tall enough that raking will not uproot it. Rake gently in one direction, then cross-rake to break up clumps. Collect the straw in bags or a tarp. This takes 1 to 3 hours depending on lawn size.
Erosion control blankets do not need removal; they decompose on their own. If pieces are still visible after 12 months, you can pull them up by hand, but most break down completely without intervention.
Burlap should be removed once grass is established enough to support foot traffic without matting down. Roll it up carefully to avoid tearing young shoots. If burlap tears during removal, leave the pieces — they will decompose.
Cost comparison: straw, blankets, and burlap
| Cover Type | Cost per 1,000 sq ft | Labor to Install | Labor to Remove | Best For |
|---|---|---|---|---|
| Straw (weed-free) | $30–$80 | 1–2 hours | 2–4 hours | Small to medium lawns, budget-conscious |
| Erosion control blanket | $150–$400 | 2–3 hours | None (decomposes) | Large lawns, slopes, low-maintenance preference |
| Burlap | $100–$200 | 1–2 hours | 1–2 hours | Slopes, small patches, precision work |
Frequently Asked Questions
Can I leave straw on the lawn after grass grows?
No. Straw left in place smothers grass, traps moisture that causes fungal disease, and blocks sunlight. Remove it once grass is 2 to 3 inches tall. If you forget and straw stays down too long, rake it out as soon as you notice — your grass will recover within a week or two.
Do I need to water through a cover?
Yes. Water passes through straw, burlap, and erosion control blankets. Water the lawn normally — aim for the soil to stay moist but not soggy. A cover slows evaporation, so you may need to water slightly less often, but do not skip watering.
What if I use the wrong kind of straw?
Hay instead of straw introduces weed seeds that will sprout in your lawn. You will spend months pulling weeds. Always buy straw labeled "weed-free." If you accidentally use hay, rake it out when ready and overseed the area with fresh seed and weed-free straw.
Can I use plastic sheeting to cover grass seed?
No. Plastic traps heat and moisture, creating conditions for mold and fungal disease. It also blocks light, which some grass seeds need to germinate. Use straw, burlap, or erosion control blankets instead.
How long does it take for erosion control blankets to break down?
Most biodegradable blankets decompose within 6 to 12 months. The timeline depends on weather, sunlight, and the blanket material. Coir (coconut fiber) blankets typically break down faster than jute. You do not need to remove them; they disappear on their own.