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    DIAGNOSIS GUIDE

    What Causes Yellow Patches on a Lawn

    Yellow patches have several common causes and telling them apart matters, because the fix for one can make another worse. Dog urine leaves distinct roughly circular patches with a darker green ring around a dead centre. Drought stress shows as broad, uneven yellowing across the whole lawn rather than isolated spots. Fungal disease creates irregular rings or patches, often after warm, damp weather. Cutting too short scalps the crown of the grass and leaves it yellow in stripes matching the mower's path.

    Getting the cause right before treating saves money and time, since watering a fungal patch or feeding a drought-stressed lawn both tend to make things worse rather than better.

    Lawn renovation from £190 for around 70m², with whole-lawn aeration and overseeding, targeted scarification where needed and topsoil on bare or damaged areas. Grass seed and topsoil are included in the agreed quote. Guide prices depend on lawn condition, access and the work required. Full-lawn scarification, full-lawn topdressing and additional materials are priced separately where needed. Send us a few photos and your approximate lawn size for a confirmed quote.

    Written by Evaldas, owner of ELawnCare. Last reviewed .

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    SEASONAL

    Lawn renovation

    Give a tired or patchy lawn a helping hand with aeration, overseeding and targeted repairs. A typical small-lawn renovation includes aeration and overseeding across the whole lawn, scarification where needed and topsoil applied to bare or damaged areas. Grass seed and topsoil are included in your agreed quote.

    FROM
    £190
    Around 70m²: from £190. Around 90m²: approximately £245 for a similar treatment. Larger lawns or more extensive renovation: individually quoted.

    Guide prices depend on lawn condition, access and the work required. Full-lawn scarification, full-lawn topdressing and additional materials are priced separately where needed. Send us a few photos and your approximate lawn size for a confirmed quote.

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    The most common causes in Cambridge gardens

    Dog urine is the single most common cause of isolated yellow circles, since the nitrogen concentration burns the grass at the centre of each spot. Drought stress is a close second in Cambridgeshire's dry summers, particularly on lighter soils that hold less moisture. Cutting too short, taking more than a third of the blade in one pass, scalps the crown and shows up as yellow stripes that follow the mowing pattern exactly.

    Fungal diseases like red thread and fusarium patch appear more after mild, wet spells in spring and autumn, usually as irregular patches rather than clean circles.

    How each cause is treated

    Dog urine patches are diluted with a thorough watering straight after the dog goes, and repaired with overseeding once the dead grass is raked out. Drought stress recovers on its own once regular rain or watering returns, though overseeding speeds up thin areas. Scalped stripes grow out within a couple of mows once the height is corrected. Fungal patches usually clear on their own once conditions dry out, and improving airflow and drainage reduces recurrence.

    COMMON QUESTIONS

    Frequently asked questions

    Almost always dog urine. The concentrated nitrogen burns the centre of the patch while the edge, diluted slightly by rainfall or extra urine, grows greener than the surrounding lawn. Watering the spot promptly after the dog goes reduces the damage.

    Widespread yellowing across the whole lawn points to drought stress, especially in a dry Cambridgeshire summer, or cutting too short across every pass. Isolated patches point to a localised cause like urine or fungal disease instead.

    Most causes are recoverable. Drought-stressed grass greens up again once rain returns. Scalped areas grow out within a couple of mows. Urine and fungal patches usually need overseeding once the dead grass is removed, since the roots in the worst-affected centre may not recover on their own.

    Yes. Lawn renovation from £190 for around 70m², with whole-lawn aeration and overseeding, targeted scarification where needed and topsoil on bare or damaged areas. Grass seed and topsoil are included in the agreed quote. Guide prices depend on lawn condition, access and the work required. Full-lawn scarification, full-lawn topdressing and additional materials are priced separately where needed. Send us a few photos and your approximate lawn size for a confirmed quote.

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