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.
Helpful advice on what to do when problems strike, whether they're diseases, disorders or otherwise - and how to prevent them occurring
Phytophthora is our second most reported disease. Causing die-back and leaf damage on trees and shrubs and is often fatal.
Impatiens downy mildew is caused by a fungus-like (Oomycete) organism that causes yellowing leaves, leaf loss, and death of bedding Impatiens, commonly called busy Lizzies, during wet weather and damp conditions. Attacks are most likely in summer, or spring in greenhouses.
These viruses have been a significant problem since the late 1980s, when the western flower thrips, their principal vector, arrived in the UK. Each virus has a huge host range and can produce a bewildering array of symptoms.
Irises can be affected by a number of diseases that reduce the vigour and quality of the plants. Some of these diseases are confined to either the rhizomatous or the bulbous types of iris, but others can affect both types. Problems can be caused by fungi, bacteria and viruses.
Kerria, once considered a disease free, spring flowering shrub, is now affected by a fungal infection that causes lesions and defoliation.
Cherry laurel (Prunus laurocerasus) is generally considered a tough evergreen but its leaves can be affected by diseases such as powdery mildew, leaf spot fungi and bacterial shothole. Affected plants or hedges look unsightly.
Dead patches of grass on lawns are very common. However, it is usually easy to trace and remedy the cause, restoring green and healthy grass.
Dry patch of lawns occurs when the soil in certain areas becomes water-repellent. As a consequence the grass suffers from severe drought, even in wet weather. The result is the appearance of patches of dead grass, with the soil proving very difficult to re-wet.
Older leaves on healthy houseplants will naturally turn brown and die back over time as the plant matures, which is no cause for concern. But if most of the foliage on the houseplant changes colour in part or whole there may be a cultural problem, often rectified by paying more attention to watering, feeding or moving the plant to a more suitable position indoors. Plants that are unsuited to the conditions are unlikely to survive let alone thrive in the long term. However many house plants are short-lived by nature indoors, poinsettia and cyclamen for example, and will often need to be regularly replaced.
Abnormal, damaged or falling leaves on a prized climber, shrub or tree can be alarming; however by following these simple steps to pinpoint the cause, gardeners can take effective action to protect their plants.
Leafy gall is a bacterial disease of the stems and roots of many herbaceous plants. Infection with this disease causes dense clusters of distorted leafy shoots.
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