Sometimes your lawn needs a little extra love. Whether it’s worn patches, thinning grass, or simply a desire for a thicker, greener lawn, sowing grass seed on an existing lawn (also known as overseeding) can work wonders. Let’s explore how to do it right and achieve the best results.
When Might You Want to Sow Grass on an Existing Lawn?
There are plenty of reasons to overseed an existing lawn:
- Worn Areas: High-traffic spots often develop bare patches that need attention
- Increasing Lawn Size: Expanding your lawn into previously unused areas can enhance your garden
- Thickening the Lawn: Adding seed improves density, making the lawn look lush and healthy
- Improving Appearance: Overseeding can revitalise tired, patchy lawns and introduce more vibrant grass varieties
- Repairing Damage: Fixing areas affected by pests, disease, or extreme weather
How to Prepare the Lawn for New Seed
- Mow the Lawn: Cut the grass shorter than usual (about 2.5 cm) and remove the clippings
- Remove Thatch: Rake away any thatch or debris that could block the seed from reaching the soil
- Aerate: Use a garden fork or aerator to create small holes in the lawn, improving air, water, and seed contact with the soil
- Level the Ground: Fill in uneven areas to ensure an even surface for seed distribution
- Fertilise: Apply a lawn fertiliser to provide essential nutrients for the new grass
How to Prepare the Seed for Sowing on the Existing Lawn
- Choose the Right Seed: Match the seed type to your lawn’s needs (e.g., shade-tolerant varieties for shady areas)
- Mix with Topsoil: For better coverage and germination, consider mixing the seed with fine topsoil before spreading
- Spread Evenly. Use a seed spreader or sow by hand, ensuring an even distribution across the lawn
How to Match Grass to the Existing Lawn
To maintain a uniform look, choose a seed mix that complements your current grass type. Look for seed labels that specify the same variety (e.g., Perennial Ryegrass or Creeping Red Fescue).
Can Different Grass Types Be Grown Together?
Yes, but with some considerations:
- Compatible Types: Mixing Ryegrass with Fescues works well, as both grow harmoniously and provide a balance of hardiness and aesthetics
- Avoid Contrasts: Combining very different textures (e.g., coarse Ryegrass with fine Bentgrass) can create an uneven appearance
- Shaded Areas: Use a shade-tolerant variety like Creeping Red Fescue in spots with limited sunlight.
When to Add Extra Seed to Your Lawn
Spring (April to June). Ideal for seed germination and growth due to warming soil and rainfall.
Autumn (September to October). Warm soil and cooler air temperatures make this another prime time for overseeding.
How to Care for the Newly Grown Seed
- Water Regularly: Keep the soil moist but not waterlogged. Water lightly and frequently until the new grass is established
- Delay Mowing: Wait until the new grass is at least 6-8 cm tall before mowing for the first time
- Mow Carefully: Use a sharp blade and set the mower to a higher setting to avoid stressing young grass
- Reduce Foot Traffic: Minimise use of the lawn during the first few weeks to protect new growth
Factors That Influence the Success of New Seed
- Consistent moisture aids germination, but heavy rain can wash seeds away
- Grass needs sunlight for photosynthesis. Shady areas will grow more slowly
- Foot Traffic: Avoid walking on freshly seeded areas to prevent compaction
- Soil Condition: Nutrient-rich, well-drained soil promotes faster growth
- Use shade-tolerant varieties in low-light areas for better results
- Growth Rates: Freshly Seeded Lawn vs Well-Established Lawn
Freshly Seeded Lawn. Takes 7-21 days for germination, with visible growth within 6-8 weeks. Initial growth focuses on root establishment.
Well-Established Lawn. Grows faster and recovers more quickly from wear and tear, especially in peak growing seasons.
Do Some Varieties Grow Faster Than Others?
Yes!
Fast-Growing Varieties: Perennial Ryegrass germinates in 5-10 days and is ideal for quick fixes.
Slow-Growing Varieties: Kentucky Bluegrass and Tall Fescue take longer but produce dense, luxurious lawns.
Tips for Encouraging the Best Results
- Use Quality Seed: Invest in high-quality grass seed for better germination rates
- Keep the Soil Moist: Water consistently, especially during the first few weeks
- Fertilise Wisely: Use a starter fertiliser to provide essential nutrients
- Aerate Regularly: Improve soil structure to encourage healthy root growth
- Protect New Growth: Use netting or deterrents to keep birds and pets away from freshly sown seed
A Late Growth Joke
What did one blade of grass say to the other?
I’m rooting for you!
How to Sow Seed for Grass on an Existing Lawn
Sowing grass on an existing lawn is a simple way to revitalise and improve your lawn’s appearance. By preparing the area carefully, choosing the right seed, and providing consistent care, you’ll soon enjoy a thicker, greener lawn. Just remember, a little patience goes a long way when it comes to grass-growing success.
Happy sowing, and may your lawn always be the envy of the neighbourhood!