Help us achieve our goals:
make a donation »
Join the RHS today and support our charity
Free personalised gardening advice
RHS members get reduced ticket prices
RHS members get free access to RHS Gardens
Reduced prices on RHS Garden courses and workshops
020 3176 5800
Mon – Fri | 9am – 5pm
Make a donation
I have forgotten my password
Keep me signed in
Register for free to receive our newsletters, add comments to blogs/articles and to save content.
See what events are on near you and browse your bookmarked pages.
Browse all our advice on plant problems
Search our A - Z directory to find out expert advice on all your plant problems.
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.
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.
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.
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.
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 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 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.
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.
Three important diseases of willows in the UK are anthracnose, scab and black canker. They harm the trees and can make them unsightly.
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.
We're a UK charity established to share the best in gardening. We want to enrich everyone's life through plants, and make the UK a greener and more beautiful place.
Join the RHS today and get 12 months for the price of 9