Grassias Fast Growing Grass Seeds box (750 g) with a dark green and blue design featuring a vibrant lawn and sky background. The packaging highlights germination in 10–15 days and suitability for summer and winter use. Three simple steps — Spread, Water, Grow — are shown as yellow icons. Coverage is listed as 37.5 m², with new lawn coverage of 21 m². The box includes a built-in seed applicator.
Grassias Fast Growing Grass Seeds 750g box resting on green grass and dark soil. The dark-themed box features a 'Fast Germination in 10–15 Days' clock badge and reads 'Fast Growing Grass Seeds — For a Healthier and Thicker Lawn' with three yellow icons for Spread, Water, and Grow. Coverage listed as 37.5m² for overseeding and 21m² for new lawns. Text overlay reads 'The Fastest Way to a Perfect Lawn!
Grassias promotional image titled 'Green Grass Made Easy' showing three steps in a triptych layout: Spread (a hand scattering grass seeds over dark soil), Water (a sprinkler head spraying water over grass), and Grow (a close-up of lush, dewy green grass blades).
Grassias before-and-after comparison image. The left side shows bare, patchy brown soil with sparse grass labelled 'Before.' The right side shows thick, lush green grass labelled 'After.' White text overlay reads 'Visible Growth in Just 10–14 Days.'
Grassias Fast Growing Grass Seeds 750g box displayed on a wooden surface against a soft-focus green garden background with sunlight filtering through leaves. Four green tick-mark badges on the left highlight key uses: New Lawn, Over Seeding, Patch Repair, and All Year Use. The box features a yellow '10–15 Days' germination badge and shows 750g net weight and 37.5m² coverage.
Grassias 'Family & Pet Friendly' promotional image showing the back view of a young child and a small curly-haired dog sitting together on a green lawn in golden evening sunlight, with a garden and flowers in the background. Text reads 'Safe for kids and pets to enjoy' with a paw-print hand icon.
Close-up overhead view of thick green grass growing alongside dark bare soil, highlighting the contrast between seeded and unseeded areas. Two callout badges read 'Certified Quality — DEFRA-registered for top tier seeds' with a rosette icon, and 'UK-Tested — Expertly mixed and proven in the UK' with a thumbs-up icon.

Grassias Fast Growing Grass Seed (750g)

Transform your garden with Grassias Fast Growing Grass Seed (750g) – the perfect solution for patch repair, over-seeding, and achieving a lush, green lawn.

🌱 Fast Growing Mix
🐶 Pet & Child Friendly
🏅 Defra Tested Seed

Weight (Coverage):

DON’t KNOW HOW MUCH YOU NEED? USE OUR GRASS SEED CALCULATOR?

£8.99
-
1
+
Add to Cart
FREE SHIPPING ON ORDERS OF £40 OR MORE
The Mix
MORE INFO
SOWING GUIDE
What’s in the mix? Below is a breakdown of what this mix is made of:
80.0%
Westerwolds
Westerwolds Ryegrass establishes quickly, providing rapid growth and excellent regrowth. Its high-yield potential ensures a dense, nutritious sward, making it a valuable addition to any mix for strong, reliable performance.
20.0%
Dwarf Amenity Ryegrass
Dwarf Amenity Ryegrass grows low and compact, creating a dense, durable lawn with a fine, attractive appearance. It’s fast to establish, resistant to wear, and ideal for high-traffic areas, ensuring a lush, long-lasting finish.

Formulated for fast germination, this premium grass seed blend ensures quick establishment, creating a thicker, healthier lawn in no time. Whether you’re repairing worn areas or enhancing your lawn’s density, Grassias delivers reliable growth with strong root development.

Designed to thrive in the UK climate, this hard-wearing lawn seed performs well in spring and summer, while also offering resilience in winter. Safe for pets and children, it’s built to withstand daily wear and tear, making it ideal for busy gardens.

With 750g covering up to 37m², Grassias provides excellent coverage and a long-lasting, vibrant lawn. Its versatile blend ensures even growth in shady areas. For best results, use with top soil for grass seeding to support deep root development.

Upgrade your garden today with Grassias Fast Growing Grass Seed – for a greener, stronger lawn all year round!

GRASS SEED CALCULATOR

Find out how much grass seed you need by simply entering your area’s measurements below.
Length In Meters
M
WIDTH IN METERS
M
Calculate
Your Lawn is Approximately
0M2
The recommended quantities you need to buy for grass seed and fertiliser areshown below.

Grass Seed Required

0 kg

Shop Seeds

Fertiliser Required

0 kg

Shop Fertiliser
Find out how much grass seed you need by simply entering your area’smeasurements below.

ARE YOU A LANDSCAPER? CLICK HERE TO LEARN MORE ABOUT OUR AWESOME SAVINGS

ARE YOU A LANDSCAPER? CLICK HERE TO LEARN MORE ABOUT OUR AWESOME SAVINGS

ARE YOU A LANDSCAPER? CLICK HERE TO LEARN MORE ABOUT OUR AWESOME SAVINGS

WHAT CUSTOMERS THOUGHT

Previous
Next

SOME FAQ’s

How long does grass seed take to grow?

Patience, my friend! Our grass seed starts sprouting in 7-10 days, but full coverage can take a few weeks. Good things (and great lawns) take time! 🌿

When is the best time to plant grass seed?

Spring 

✅ The temperature is rising, so seeds will germinate well.

✅ Rainfall helps with moisture (but dry spells mean more watering from you!).

⚠️ Weeds are more active, so you might have to fight off some uninvited guests.

⚠️ Hot summer weather can stress young grass before it’s fully established.

Autumn

✅ The soil is still warm from summer, helping seeds germinate quickly.

Rainfall increases, meaning less watering for you!

Weeds are less aggressive, so your new grass has less competition.

✅ Roots have time to establish before winter, making for a stronger, greener lawn in spring.

Winter & Summer – Not Ideal!

Winter is too cold for germination. Seeds will just sit there, waiting for warmer days.

Summer is often too hot and dry, making it harder to keep new grass hydrated.

How often should I water newly sown grass seed?

Watering is crucial for seed germination, but balance is key—too little and the seeds dry out, too much and they might rot.

For the best results:

Water lightly once or twice a day to keep the soil consistently moist but not soaked.

Use a gentle spray or sprinkler to avoid washing away seeds.

Once the grass starts sprouting, reduce watering to once a day or every other day, depending on weather conditions.

When the grass reaches about 2 inches tall, shift to deeper, less frequent watering to encourage strong root growth.

Avoid overwatering—soggy soil can suffocate seeds and promote disease. The goal is damp, not drenched soil.

WhY is my grass Seed not GROWING?

Success starts with quality seed and proper preparation. Our seeds are DEFRA tested for high germination rates (+90%) — so growth comes down to how well you prepare the ground.

Key Steps to Get the Best Results:

Clear the Area – Remove weeds, old grass, and debris to give seeds the best chance to take root.

Loosen the Soil – Lightly rake or aerate the soil to improve drainage and seed-to-soil contact.

Apply Fertiliser – A pre-seeding fertiliser (like Grassias®) gives young grass the nutrients it needs to establish strong roots.

Sow the Seed Evenly – Spread seeds at the recommended rate, avoiding clumps or bare patches.

Press the Seed In – Lightly rake or roll the area to ensure good soil contact without burying the seeds too deep.

Water Consistently – Keep the soil moist but not waterlogged, watering lightly once or twice a day until the grass is established.

Protect from Birds & Foot Traffic – Use netting or a light covering if needed, and avoid walking on the area.

HOW DO I GET MAKE MY LAWN GREENER?

To get a greener lawn, focus on feeding, watering, and mowing correctly. Use a 6-9-6 fertiliser for balanced nutrients or iron sulphate to enhance colour and harden the grass. Apply fertiliser in spring and autumn for the best results. Water deeply but less often, preferably in the early morning or evening, to encourage strong roots and prevent evaporation.

Keep your lawn healthy by mowing at the right height, aerating compacted soil, and overseeding thin areas. If moss or weeds are an issue, iron sulphate helps suppress moss, while a selective weed killer targets unwanted plants. With regular care, your lawn will stay lush, green, and thriving.

SHOULD I USE FERTILISER?

You don’t have to use fertiliser, but we highly recommend it if you want faster growth, stronger roots, and a greener lawn. Fertiliser gives your grass the essential nutrients it might not get from the soil alone, helping it establish quickly and stay healthy year-round.