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  • white rust

    Chrysanthemum white rust

    Chrysanthemums may be severely weakened by a disease known as white rust. It is no longer a notifiable disease when found in gardens but can be bad news for the gardener.

  • Citrus longhorn beetle adult and exit hole. Fera, ©Crown copyright, 2011

    Citrus and Asian longhorn beetles

    Citrus longhorn beetle, Anoplophora chinensis, and Asian longhorn beetle, Anoplophora glabripennis, are non-native wood-boring pests that can cause serious damage to a wide range of broad-leaved trees and shrubs. Citrus longhorn beetles have been intercepted in the UK on imported Japanese maples.  An outbreak of Asian longhorn beetle at Paddock Wood, Kent in 2012 is believed to have been eradicated. These beetles are not yet established in the UK and are quarantine pests in the European Union. Any sightings in Britain must be reported to the Food and Environmental Research Agency (FERA).

  • Yellow leaves on citrus caused by low temperatures. Credit:RHS/The Garden.

    Citrus: problems

    Growing citrus in containers indoors means that plants can be sheltered from our less than perfect climate. However, ideal conditions are not always possible to achieve and this may result in a range of cultivation problems.

  • © RHS WSYD0016022

    Cleavers

    Cleavers (Galium aparine), with its characteristic ‘sticky’ seeds, is easily introduced to gardens from uncultivated land and can become a sprawling nuisance in beds and borders.

  • Clematis

    Clematis

    Clematis is one of the most popular garden plants and no wonder; this versatile plant can be grown on walls, pergolas, frames, in containers, or left to scramble through trees and shrubs.

  • Pruning a late-flowering clematis. RHS/Advisory.

    Clematis pruning: group three

    Regular pruning of clematis encourages strong growth and flowering and keeps the growth in check. If left unpruned, clematis can turn into a mass of tangled stems with a bare base and flowers well above eye level. Clematis in pruning group three flower in late summer on growth made in that season and should be pruned in late winter or early spring. This method is suitable for herbaceous clematis.

  • Enjoy two flushes of flowers from Clematis 'Kaen' with proper pruning. Credit: RHS/Tim Sandall.

    Clematis pruning: group two

    Regular pruning of clematis encourages strong growth and flowering and keeps the growth in check. Left unpruned, clematis can turn into a mass of tangled stems with a bare base and flowers well above eye level. Clematis in pruning group two are the large-flowered hybrids that flower in May to June and should be pruned in late winter or early spring and after the first flush of flowers in summer.

  • Clematis slime flux

    Clematis problems: frequently asked questions

    Clematis is one of the most popular climbing plants, its showy flowers giving an eye-catching display. It is usually an easy plant to grow, but can have an aura of mystery surrounding two items in particular: first, when and how to prune the plant, and second, a problem of shoots wilting and dying back. There are also a few other problems to look out for.

  • clematis slime flux

    Clematis slime flux

    Clematis may occasionally be affected by a distinctive disease called slime flux, characterised by a whitish, smelly ooze coming from the stems. Fortunately, it may be possible to save affected plants.

  • Clematis wilt. Image: RHS, Horticultural Science

    Clematis wilt

    Clematis wilt is a fungal disease of clematis, particularly the large-flowered hybrid cultivars. The fungus causes rapid wilting and, in severe cases, can kill the whole plant.

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