A bright, lush lawn is the dream. And on the surface, weed and feed sounds like the perfect shortcut a miracle mix that kills weeds and boosts growth in one go. But while it might seem like an easy win, it’s not always the silver bullet it appears to be.
Like most things in gardening, quick fixes can come with hidden downsides. In this article, we’ll break down the real drawbacks of using lawn weed and feed, and help you decide if it’s right for your garden or if there’s a smarter way to get that rich, green lawn you’re after.
One Size Doesn’t Fit All
Let’s start with the basics.
Weed and feed products combine two functions a fertiliser to promote growth and a herbicide to kill weeds. Handy, right? But they’re not tailored to your specific lawn.
Why that’s a problem:
- Not all weeds are affected (some, like couch grass or bindweed, survive)
- Grass might not need fertilising when you apply it
- Uneven lawn patches could be worsened, not improved
At Lawn & Gardens Sussex, we assess your lawn’s unique condition before applying any treatment because no two gardens are the same.
It Can Damage Your Lawn
Fertilisers in weed and feed are typically high in nitrogen, which fuels rapid growth. But too much of a good thing can scorch your lawn especially during warm, dry spells.
Common signs of damage:
- Yellowing or burnt grass patches
- Uneven colouring across the lawn
- Weaker root development over time
Tip: Always water after application unless the product is designed for dry use. And never apply on a hot afternoon!
Not Always Pet or Plant-Friendly
Many weed and feed products include chemical herbicides that don’t discriminate. They’ll attack broadleaf plants and that includes your flowers, shrubs, and even vegetables if the wind catches it.
And pets? According to the UK HSE pesticide guidance, treated lawns should be avoided by pets and children until fully dry.
Potential risks:
- Overspray can damage nearby plants
- Dogs and cats may pick up residue on paws
- Edible crops should be kept well clear
Prefer peace of mind? Go for organic, pet-safe alternatives, or ask us about gentle treatment options designed with safety in mind.
Weakens Soil Over Time
One of the biggest long-term issues with regular weed and feed use? Soil quality.
Chemical-based feeds may give a fast fix, but they can strip beneficial microbes, alter pH levels, and make your lawn reliant on artificial nutrients.
The soil consequences:
- Reduced natural fertility
- Loss of earthworms and microbes
- Soil compaction and drainage problems
That’s why we always recommend aerating, scarifying, and compost-based feeding as part of a balanced lawn care plan. Health starts below the surface!
Environmental Concerns
What happens after you water in that weed and feed mix—or it rains? Some of those chemicals can run off into storm drains or nearby beds.
According to the RHS, excess fertilisers and herbicides can contribute to water pollution, harm pollinators, and damage garden biodiversity.
Eco-related drawbacks:
- Runoff can reach water systems
- Impacts bees and beneficial bugs
- May affect wild grass or wildflower patches nearby
Care about wildlife and sustainability? So do we. At Lawn & Gardens Sussex, we’re always happy to recommend eco-friendly, low-toxicity treatments that get results without harming the planet.
It’s Not a Cure-All for Every Weed
Weed and feed is great for common broadleaf weeds like dandelions or clover—but it won’t touch:
- Grassy weeds (e.g. annual meadow grass)
- Deep-rooted weeds (e.g. dock, nettle)
- Moss or fungal lawn diseases
You may still need to spot-treat tough areas, reseed bare patches, or aerate the soil for lasting improvement.
The Drawbacks of Lawn Weed & Feed
- Can burn grass if used incorrectly
- Not effective on all weeds
- Harms non-target plants and nearby flowerbeds
- Can impact soil health and microbial balance
- Not always safe for pets or wildlife
- May pollute water through runoff
The Better Way? Professional Lawn Care
Here’s the thing: weed and feed isn’t bad it just needs to be used correctly. And most people don’t know when, how, or if their lawn even needs it.
At Lawn & Gardens Sussex, we take a tailored approach:
- We test your lawn’s condition before applying anything
- We choose safe, effective products suited to the season
- We use targeted treatments no unnecessary chemicals
- We combine care with aeration, scarifying, and reseeding if needed
The result? A healthy, long-lasting lawn without risking your plants, soil, or pets.
FAQs
1: Can weed and feed kill my grass?
Yes, if overapplied or used during hot, dry spells it can burn or discolour your lawn.
2: Will it harm my flowerbeds or borders?
Yes. If it spreads beyond the lawn, it may damage other broadleaf plants or shrubs.
3: How long should I keep pets off the grass?
Wait until the lawn is completely dry typically 24 hours. Always check the product label.
4: Are there safer alternatives?
Yes! Organic feeds and spot weeders are available and we offer custom low-chemical options too.
Final Thoughts:
Weed and feed can be helpful but only if used with care. For many gardens, the drawbacks outweigh the benefits when applied incorrectly or too often.
You’re unsure what your lawn really needs, let us help. At Lawn & Gardens Sussex, we deliver professional treatments that feed your grass, remove weeds, and protect the rest of your garden. Because your lawn deserves more than a quick fix it deserves expert care.
- Book a consultation
- Explore our weed and feed services