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.
Sempervivum leaf miner was first recorded in southern England during 2008. It has spread slowly but can cause serious damage to house leeks. It originates from mainland Europe.
Sheep’s sorrel (Rumex acetosella) is a relative of dock whose tangy young leaves in long grassland are favoured by foragers. However, in gardens especially on sandy, acidic soils it can be a troublesome weed.
Shepherd’s purse (Capsella bursa-pastoris) is a fast-growing and prolific annual weed, known to many gardeners for the sheer number of seedlings produced each season and the time it can take to control.
Silver leaf is a fungal disease of the wood and leaves of some trees, especially plums, apples, apricots and cherries. The fungus infects the wood through wounds and causes a silvering of the leaves followed by death of the branch.
This recently recognised fungal disease affects cedars and hemlocks. It causes shoot tip dieback and defoliation. Young trees may be killed if branches/trunk are girdled but it is reported that infected mature trees can live for many years.
Slime moulds occasionally cause concern when they appear on lawns, but they do not attack or kill the grass. They vary greatly in their colour, size and form. Their spore-producing structures are often very fragile, disintegrating when touched.
Slugs are persistent and widespread pests which can cause havoc in the garden, eating holes in leaves, stems, flowers, tubers and bulbs. They can cause damage throughout the year on a wide range of plants, but seedlings and new growth on herbaceous plants in spring are most at risk.
Whilst they are not seen as commonly as their close relatives the rusts, smut fungi can affect a range of garden plants, including some widely-grown vegetables and ornamentals. Some smuts cause conspicuous growth distortions, whilst others cause leaf spotting. All can contaminate the soil for extended periods of time.
Snails are familiar animals that can cause a lot of damage in the garden, eating holes in leaves, stems and flowers.
Grey mould in snowdrops is an infection or disease caused by the fungus Botrytis galanthina, causing leaves and flowers to collapse. A fuzzy grey mould forms under wet conditions.
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