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  • Weedkiller damage on a rose. Credit: RHS/Tim Sandall.

    Weedkiller damage

    Weedkillers are designed to kill unwanted plants. Unfortunately, it is all too easy to damage or even kill desirable plants if care is not taken when applying weedkillers. Since there are no remedies, prevention is best.

  • Weedkiller in manure symptoms on tomato. Credit:RHS/Advisory

    Weedkiller in manure

    Contaminated farmyard manure can cause damage to vegetable crops in gardens and allotments. This contamination is caused by application of weedkillers to farmland used to grow hay and other forage which are then eaten by stock.

  • Weeds on hard surfaces

    Weeds on hard surfaces

    Paths or patios are sometimes deliberately planted with thymes or other low-growing plants to add interest. However, many unwelcome weeds find their way into drives and the cracks between paving. There are several options to tackling them.

  • Hoeing is a good option if you don't want to use chemicals. Image: Neil Hepworth/RHS

    Weeds: non-chemical control

    Weeds can be controlled without resorting to weedkillers. Cultural or organic control measures rely on killing or restricting the weeds by physical action, from manual removal to smothering, burning and using weed barriers.

  • © RHS SCN0004971

    Western conifer seed bug

    The western conifer seed bug, Leptoglossus occidentalis is a large brown bug native to North America which has become established in the UK since 2007. It feeds on pines but causes no noticeable damage to garden trees.

  • White blister

    White blister

    White blister is a foliar disease that may be found in the garden on a limited range of ornamentals, vegetables and weeds. It can reduce plant vigour, and sometimes also causes distorted growth.

  • Wild garlic. Image: Mike Grant/RHS

    Wild garlic and crow garlic

    Wild garlic or ramsoms are a pleasing sight in British woodlands, producing a haze of white flowers from April to June. The leaves are edible and add a garlic flavour to salads. However, their persistent bulbs and spreading habit make them a problem in most gardens. The less common but equally persistent crow garlic can also be a nuisance.

  • To look their best, meadows need careful maintenance. Credit: RHS/Tim Sandall.

    Wildflower meadow: maintenance

    Wildflower meadows require an annual maintenance programme to allow the more desirable species to flourish and to reduce the vigour of the more rampant species. This usually involves mowing and some judicious weed control.

  • Willow anthracnose, scab and canker

    Willow anthracnose, scab and canker

    Three important diseases of willows in the UK are anthracnose, scab and black canker. They harm the trees and can make them unsightly.

  • ©RHS_SCN0005172

    Willow leaf beetles

    The feeding activities of bronzy green or bluish black beetles and their black larvae can cause foliage of willows, aspen and poplars to dry up and turn brown.

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