Nothing beats the look of a thick, green, weed-free lawn but knowing when to apply weed and feed makes all the difference. It’s not just about throwing some pellets down and hoping for the best. Timing it right helps your lawn absorb nutrients properly and fight off weeds before they take hold.
So, if you’re wondering when I should weed and feed my lawn, you’re in the right place. In this post, we’ll guide you through the perfect times of year to treat your turf, explain why it matters, and share how we at Lawn & Gardens Sussex make lawn care stress-free.
Spring & Autumn: The Golden Windows
In the UK, the two best times to apply weed and feed are spring and autumn. Why? Because your lawn is actively growing and can absorb all the good stuff while weeds are still young and easy to remove.
Spring: Wake Up Your Lawn
After winter, your grass needs a bit of TLC. Spring is the perfect time to kickstart new growth and tackle early weeds before they spread.
- Best time: Mid-March to early May
- Ideal conditions: Mild temperatures, moist soil, no frost
- What it does: Boosts growth, greens up grass, stops weeds early
Avoid applying just after mowing let the grass recover first.
Autumn: Strengthen Before Winter
Autumn feeding helps your lawn recover from summer stress and prepares it for colder weather. It also keeps moss and late-season weeds in check.
- Best time: Mid-September to early November
- Ideal conditions: Damp soil, mild weather not frozen
- What it does: Builds root strength, boosts resistance, fights moss
Choose an autumn-specific formula with less nitrogen and more potassium for stronger roots.
When Not to Apply Weed and Feed?
Getting the timing wrong can lead to patchy grass, wasted product or worse, burnt turf. Avoid applying weed and feed:
- In hot, dry summer conditions
- On frozen ground
- During heavy rain or before forecast downpours
- When weeds are dormant or grass isn’t growing
Applying in poor conditions means nutrients can’t be absorbed, and chemicals may run off into drains or nearby beds.
What Type of Product Should You Use?
Weed and feed products come in different seasonal formulas. Using the right one at the right time makes a massive difference.
Spring/Summer Mix:
- High in nitrogen to boost green growth
- Targets common weeds like dandelions and clover
Autumn Mix:
- Higher potassium to strengthen roots
- Often includes moss control
- Less nitrogen to avoid forcing weak leaf growth
Popular UK choices:
- EverGreen Complete 4-in-1 Great all-round spring/summer option
- A1 Lawn Autumn Moss Killer & Feed Strong autumn recovery mix
For official guidance, check the RHS Lawn Feeding Guide or UK Government’s Pesticide Safety Advice.
How Often Should I Weed and Feed?
You don’t need to overdo it. For most UK gardens, twice a year is enough.
- Spring: Encourages lush, healthy growth
- Autumn: Builds strength and prevents winter damage
You can spot-treat problem areas through summer, but avoid blanket feeding in heatwaves—it can do more harm than good.
Why Let the Pros Handle It?
Weed and feed seems simple but if your lawn is patchy, weedy, mossy, or shaded, a generic product won’t solve the issue. That’s where we come in.
At Lawn & Gardens Sussex, we offer:
- Seasonal, pet-safe weed and feed treatments
- Professional application (no missed patches!)
- Advice on mowing, watering, and long-term care
- Full lawn rescue plans if things need extra attention
Explore our feed and feed service here or get in touch to book your tailored treatment.
FAQs:
1: What month should I weed and feed in the UK?
March–May (spring) and September–November (autumn) are ideal. Avoid summer heat and winter dormancy.
2: Can I apply weed and feed after mowing?
Yes. but wait 2–3 days after mowing so the grass can recover. Don’t mow again for another 3–4 days post-treatment.
3: Is weed and feed safe for pets?
Most products are safe once dry, but always check the label. We offer pet-friendly treatments on request.
4: How long before I see results?
Typically, you’ll notice greener grass in 7–10 days. Weeds start dying off after 10–14 days.
Final Thoughts:
The secret to a lush, weed-free lawn isn’t just the product it’s the timing. With the right weed and feed applied in spring and autumn, your grass gets the nutrients it needs while keeping stubborn weeds at bay. Want it done properly, without the trial and error? We’ve got you covered. At Lawn & Gardens Sussex, we use seasonal, expert treatments that give real results backed by years of local lawn care experience.
Ready to give your lawn a fresh start? Book your seasonal weed and feed now