The preparation work is done, and your new grass seeds have been sown. Now the burning question – how long does grass seed take to grow?
In short, grass seed takes around 10 days to grow
after sowing and will be fully established and ready for use roughly 6-8 weeks
after initially sowing. However, this relies on a number of factors falling
into place. Most importantly, having the right conditions at the time of sowing
and just after.
Ideal conditions for grass seed growth
In order for grass to grow, it will need heat, air and
water. A combination of all three will normally result in a quick and
We recommend waiting until temperatures are reaching
at least 8-10 degrees, consistently for two weeks before you start sowing grass
seed. Typically, this will start to happen in March in the UK.
However, it is always worth checking with your weather
app ahead of sowing, as some areas in the UK won’t reach these temperatures
until April, while some locations in southern part of England will experience
these much sooner in the year.
The optimal time for sowing a new lawn is normally in
spring or autumn in the UK. While you can sow your seeds in summer, the
temperatures can sometimes peak and cause heat damage to your seeds, or you may
experience drought, which will also halt the germination process.
Water is an essential part of the germination process
for your grass seeds. Without it, the process will slow down significantly, and
in the worst cases, it may stop completely. Having a consistent supply of water
on your soil bed will allow the seed to absorb the moisture and expand their
cells, which will encourage them to sprout. Normally in the UK, rain is a
frequent occurrence, so the watering side of things is usually taken care of
It is worth mentioning that if there is little to no
rain, you should water your grass seeds yourself. As with most things,
everything in moderation, so, if a heavy
rainfall is forecast, don’t mistake this for an ideal
time to sow, as too much water may only cause flooding and damage to your
In order for the seeds to sprout, they will need air.
This might seem like an obvious thing to point out, but while there is air
surrounding us at all times, during periods of extreme heat this can become hot
and dry and may damage the seeds. An adequate level of air will allow the roots
to breath and successfully grow. By allowing air to reach the soil, the grass
roots will take in oxygen and remove carbon dioxide in the process. Without
that, carbon dioxide can enter the soil and restrict seed growth and limit the
intake or water and other beneficial nutrients.
If the above conditions are favourable, you should
start to see grown within ten days of sowing and achieve a fully established
lawn 6-8 weeks later. If water, air or heat is restricted it may slow down the
process of germination.
Variations in grass seed types
While most grass
seed types will follow the usual 10 day germination period
in ideal conditions, there are specialist
grass seed types, like our shade mixes that contain
fescues which require temperatures of around 15 degrees and above to germinate.
To find out more about how long grass seeds takes to
grow, and how to care for your grass once it has fully established, visit our grass
seed help and advice page.