At Flymo, we believe getting the timing of your first mow just right sets the tone for a lush, healthy lawn all season long. Mowing too early can do more harm than good. But wait too long, and you could end up battling patchy growth and an uneven finish. So, when exactly is the sweet spot?
Why Timing Is Everything
Early spring can be unpredictable. While it’s tempting to dust off the mower at the first glimpse of sunshine, cutting your grass before it’s actively growing again can leave it vulnerable to late frosts and unnecessary stress.
Grass typically “wakes up” when soil temperatures consistently rise above 6–8°C. By late March, often aligning with the first Sunday of astronomical spring, conditions are usually milder, daylight hours are longer, and your lawn is ready to respond positively to its first trim.
Waiting until your lawn has properly come out of dormancy means your first mow strengthens the grass rather than weakening it.
The Little-Known Science Beneath Your Feet
Here’s something surprising: your lawn is a bit of a chatterbox.
That fresh-cut grass smell? It’s actually a chemical signal released when grass blades are cut. These signals can prompt nearby plants to boost their own natural defences.
So your first mow of the season isn’t just about tidying up — it’s part of a fascinating biological process happening right under your feet.
The Golden Rule: Don’t Scalp Your Lawn
The biggest mistake gardeners make with their first cut? Taking too much off.
Follow the one-third rule:
- Wait until your lawn reaches around 5–8cm in height
- Never remove more than one third of the grass blade in a single mow
- Set your mower to its highest cutting height for that first trim
For example, if your grass is 6cm tall, only remove 1–2cm. Taking off too much (often called “scalping”) can stress the lawn, invite weeds, and increase the risk of disease. A gradual approach encourages stronger roots and thicker growth.
That’s why many Flymo mowers are designed with easy height adjustment, including simple push-and-go controls and clear height indicators on our latest cordless models — so you can mow with confidence and precision.
Should You Leave Grass Clippings?
Good news: fine clippings can actually benefit your lawn.
Light clippings are around 80% water and contain valuable nutrients like nitrogen. As they break down, they feed goodness back into the soil.
Just make sure:
- Clippings are light and evenly distributed
- You avoid leaving behind thick clumps, which can block light, trap moisture and encourage moss or disease
First Cut Sunday: The Dos and Don’ts
DO:
- Wait until late March, when grass is actively growing
- Check your lawn height before mowing
- Stick to the one-third rule
- Leave fine clippings to naturally nourish your lawn
DON’T:
- Mow too early while frost is still a risk
- Leave your first cut too late and risk patchiness
- Cut the grass extra short to “tidy it up”
- Leave heavy clumps of wet clippings behind
Set the Tone for Summer
There’s nothing quite like starting up your mower for the first time each year. But patience pays off.
Get the timing right, follow the one-third rule, and your lawn will reward you with strong, healthy growth — and that lush summer finish that makes the neighbours green with lawn envy.
Ready to start as you mean to mow on?
