Dandelions are hard to remove from lawns, but gardeners can stop the weeds growing with a solution that won’t harm grass
Katherine McPhillips and Ellen Jenne Senior U35 Spare Time Writer
08:38, 03 Apr 2026
Dandelions are hard to remove from lawns, but gardeners can stop the weeds growing with a solution that won’t harm grass(Image: Jan Rozehnal via Getty Images)
Dandelions, with their vivid yellow blooms, are notorious for invading lawns and proving notoriously tricky to eradicate – yet there is a surprisingly straightforward method to halt their growth without causing any damage to your grass. These troublesome plants are widely regarded as weeds due to their tendency to smother grass by blocking sunlight, frequently leaving unsightly bare patches across lawns.
Each dandelion is capable of producing hundreds of wind-carried seeds once they transform into their distinctive white, fluffy state, meaning gardeners must act swiftly in April to ward off a full-scale infestation. What makes dandelions particularly challenging to tackle is their exceptionally deep root systems.
Attempting to dig them out is often a fruitless endeavour, while most weed treatments carry the risk of damaging the surrounding grass.
However, Catherine Moravec, a horticulturist with Colorado Yard Care, has identified a “natural method to kill dandelions” that poses no threat to your lawn and can actually help it grow considerably thicker.
Gardeners need to act quickly in early April as one dandelion plant can spread hundreds of seeds(Image: Getty)
Catherine said: “One option that I have come across recently that I recommend you give a try is iron HEDTA. This is a naturally occurring organic product that is just a soluble form of iron.”
As reported by the Express, Catherine added: “The nice thing about this product is that it will affect the dandelions and not the grass.”
Broadleaf plants such as dandelions are far more sensitive to iron than grasses, and even the briefest exposure can suffocate them, causing them to wilt rapidly.
Grass absorbs considerably less iron than broadleaf weeds, and the modest amount it does take in can prove beneficial, acting as a nutrient to promote a healthier, more robust lawn.
Iron is essential for chlorophyll production, which gives lawns a vibrant green colour and enhances photosynthesis. This enables the grass to absorb more energy and grow stronger.
It’s a straightforward yet highly effective method for tackling lawn weeds without spending hours digging them out or relying on weaker natural alternatives like white vinegar, which can damage the grass.
One of the best ways to deal with dandelion weeds on a lawn is to spray them with iron(Image: Getty)
How to use iron to keep dandelions off lawns
Iron herbicides are available in concentrated or ready-to-spray formats at garden centres. Take care not to confuse it with iron sulphate, a similar product commonly used to control moss on lawns but is considerably more potent, which is why it’s not recommended for regular use on weeds.
If you purchase the spray version of iron HEDTA, simply apply it directly to dandelion plants. It tends to work rapidly, with the weed disappearing after just a few hours.
For a concentrated form of iron, mix it with water. You’ll need a spray bottle, then follow the instructions on the packaging to use the correct amount.
Catherine said: “I found in my yard that once I sprayed a dandelion, it typically takes care of that particular plant for good. There have been a few cases where they have regrown, but I spray them one more time, and they seem to be eliminated.”
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