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  • Camellia gall. Image: RHS, Horticultural Science

    Camellia gall

    Camellia gall is a fungal disease causing large cream-coloured swellings (galls) on camellias. The galls may look alarming, but cause little or no long-term damage to the plant.

  • Camellia leaf blight

    Camellia leaf blight

    These fungal diseases of camellias cause brown leaf blotches, premature leaf loss and twig or branch dieback. They are most damaging on young plants or newly propagated material.

  • Camellia 'Phyl Doak' (reticulata × saluenensis) © RHS (WSYD0004829)

    Camellia problems: frequently asked questions

    Camellias are spectacular plants when in flower, and by growing a range of species and cultivars the gardener can have plants in bloom from autumn to early summer. Many of the common problems arise from growing these woodland, acid-loving plants in the wrong conditions, although they are also prone to a range of pests and diseases.

    Here we give answers to many of the common problems encountered. They are grouped by the area of the shrub affected: roots, stems and branches, leaves and flowers.

  • Camellia yellow mottle virus. Image: RHS, Horticultural Science

    Camellia yellow mottle virus

    Camellia yellow mottle virus causes yellow and creamy-white blotches on leaves of camellias. It may also cause discoloured areas within the petals (flower breaking). This virus has little effect on vigour.

  • Campsis x tagliabuana 'Madame Galen'. Image: Graham Titchmarsh/RHS

    Campsis

    Campsis, or trumpet vine as it is commonly known, is a self-clinging climber grown for its clusters of showy, exotic orange to red or yellow, trumpet-shaped flowers.

  • Virus on canna. Image: RHS, Horticultural Science

    Canna viruses

    Cannas can be infected by one or more of Canna yellow mottle virus (CaYMV), Bean yellow mosaic virus (BYMV) and Canna yellow streak virus (CaYSV). Plant viruses are the most serious problem affecting cannas in the UK, causing stunted growth, distortion and mottled leaves.

  • Capsid damage on artichoke. Credit: RHS/Simon Garbutt.

    Capsid bugs

    Capsid bugs can spoil the appearance of plants by giving the foliage a tattered and distorted appearance and causing flower buds to abort.

  • Crop protection. Credit: RHS/Neil Hepworth.

    Carrot fly

    Carrot fly can make a large proportion of carrots and allied vegetable crops inedible.

  • Garden moggy

    Cats

    Cats are much-loved pets but can cause problems for some gardeners, particularly when gardens are used as toilet areas.

  • Ceanothus 'Cascade'. Image: RHS Herbarium

    Ceanothus

    Attractive blue, white or pink flowers make Ceanothus (or Californian lilac) a desirable shrub for a sunny, sheltered position.

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