Ground elder

Time to act:

Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov

Characterised by apple-green, lobed leaves and flat heads of cream-white flowers in summer, ground elder spreads rapidly. What makes it even more difficult to eradicate is it can creep between cultivated plants. It creates large clumps of foliage that obscure and smother smaller plants. Ground elder dies down below ground in winter, which means it's difficult to spot when cultivating the soil. However, it's capable of re-growing from only small fragments of root, making it a particularly virulent plant.

Symptoms

This vigorous, spreading perennial is rampant, growing over cultivated plants and making them compete for light, water and nutrients.

Find it on

established flowerbeds, freshly dug soil, cracks in paving, lawns

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Organic

In existing flowerbeds, it's best tackled by digging up the cultivated plants and washing their roots to tease out the cream-white roots of ground elder. Regular cutting of the foliage, just below ground level with a hoe will gradually weaken the plant, but this needs to be done every 7-10 days, as soon as regrowth appears. Alternatively, fork through the soil every 10 to 14 days, removing every piece of ground elder root that's found.

Chemical

Apply systemic weedkiller to the foliage as soon as it appears in spring. Re-apply throughout the growing season at four- to six-week intervals, or as soon as any re-growth appears.

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