How to Grow a Lawn from Grass Seed?

Starting a lawn from grass seed can be a rewarding and cost-effective way to have a lush, green outdoor space.

Whether you’re starting a new lawn or reviving an existing one, growing a lawn from grass seed requires some patience and effort, but with the right steps and techniques, you can achieve a beautiful lawn that will be the envy of your neighborhood.

How much grass seed do I need?

The First step is to work out how much grass seed you need to order

For rectangular gardens you can work out the area in square meters by multiplying the width by the length

For more complex shapes, try breaking them up into smaller rectangles to make it easier

This is important because a lot of lawn care products that you apply will all reference their application rates in grams per square meters

So we need to know how many square meters your lawn is to work out how much product to buy

Typically grass seed will be applied

  • 25 to 50 grams per square meter when overseeding
  • 50-70 when sowing a new lawn from scratch

Pre Seed Fetiliser

When using seed I always use a pre seed fertiliser at same time to give the seed all the nutrients it needs to grow

It’s important to pick a specialist pre seed fertiliser and not to use products with high iron or weedkiller in them as they can damage new seeds

When to Sow Grass Seed?

We should avoid sowing seed if there’s a likelihood of frost or drought

If you are applying grass seed when periods of hot sunny weather is expected, make sure to keep up with regular watering

The soil needs to be constantly moist during the germination period

This is why you see alot of people recommend sowing seed during spring and the autumn because the weather generally is more favorable for seeding during those points

It is possible to seed outside of those areas providing you can maintain the watering during the summer

Ground Preparation

When the conditions are right it’s then time to prepare the ground

The soil should not be too compact at this stage and the top one to two inches needs to be worked into a fine tilth, the area also needs to free from weeds or large stones.

This is a perfect time to try and level any bumps out before the grass seed goes down

If you are overseeding, cut the lawn short at this stage and rake out any moss and thatch so the seed can contact bare soil.

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Applying Grass Seed

Measure the area of lawn you have in square meters. A 7m x 10m lawn would be 70m²

Calculate how much product you need

Overseeding Example: A 70m² lawn at 35g/m² would need around 2450g or approximately 2.5kg of seed
New Lawn Example: A 70m² at 70g/m² would need around 5000g or 5kg of seed

Spreading Grass by Hand

5a.1) To help you apply the seed by hand evenly, divide the lawn up into smaller sections e.g into quarters.

You can do this by eye or by using string

As you become more familiar with the process you may choose not to divide the area up or divide the area into larger sections e.g. in half not quarters

5a.2) Weight out the amount of product you need and split it evenly between the sections you divided your lawn into

Example : If you split your 70m² lawn into quarters split the 2.5kg of product into 4 even amounts, one for each section

Evenly spread the product across each lawn section.

TIP: If you are unsure, spread the product lightly across each section doing two passes one in each direction for even application.

Using a Lawn Spreader

5b.1) Check your spreader manual for the correct setting

Overseeding Example: Scotts rotary setting 30
Overseeding Example: Scotts drop spreader 14

New Lawn Example: Scotts rotary setting two passes at setting 30 – one in each direction
New Lawn Example: Scotts drop spreader two passes at setting 14 – one in each direction

Weigh out the product required into your spreader

Walk at an even pace to apply the product onto the lawn

Watch the step by step video to overseed your lawn

The Ultimate Guide to OVERSEED your LAWN

Top Soil, Compost or Dressing

One way to reduce the birds eating your seeds and help keep it moist is to lightly cover with topsoil

This will also help keep the seed in contact with the soil for germination

For new lawns – One way of doing this is by using the back of a rake and riddling into the soil until most of the seed has disappeared

For overseeding – you can skip this step but it can also be a good time to level out the lawn and results can be better if the seed is covered

Tread or roll in the seeds

Having good seed to soil contact is key if you want your new seed to grow

Lightly Tread down or roll in the new seed to ensure it is in contact with the soil

Water the grass seed

The seed can take anywhere between 7 to 21 days to germinate depending on what type of seed mix that you use in it also depends on soil temperatures and moisture levels

The really key thing about sowing seed is you need to keep it moist

Lightly water 1-3 times per day for roughly 5 mins or enough maintain moisture in the ground

When to cut new grass seed

When the new grass height has reached a length of around one to two inches it’s time to give it a first cut

This point you don’t want to be cutting it too short only take a small section off the top of the grass tips to leave plenty of growth

If you cut the grass down to the ground it could seriously damage anything that you’ve sowed

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  1. Jeremy Gowing

    Hi, I’ve bought some Autumn feed from you. My lawn was in a bad state in spring so I scarified and overseeded it. It’s still patchy in a few places. I was just wondering if I should scarify it again before feeding it or try overseeding again. And if overseed it can I put the autumn feed after?

    1. Hi Jeremy,

      Only scarify if you have thatch or dead grass. If not you can miss this step out.

      Yes i would overseed the patches first then once the grass is established, cut your lawn then apply the dark green autumn fertiliser.

      Please follow the below steps when applying grass seed:

      1) Cut your lawn
      2) Rake or scarify the lawn to remove thatch and debris
      3) Apply the seed start fertiliser
      4) Apply the grass seed
      5) If possible tread or roll down the grass seeds or lightly cover with fine compost or screened topsoil
      6) Water in and maintain regular watering until it’s germination

      All this can be done in the same day (yes you can apply then seed start and grass seed on the same day 😀 )

      Germination typically takes 7-28days although this is weather dependent as these are natural products.

      When the seeds are around 1-2inches cut your lawn and then you can apply our dark green granular feed which will feed your lawn with all the essential nutrients to keep it looking green and healthy


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