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This fungal problem results in rounded spots on the leaves. Although it's unsightly, leaf spot is only a significant problem on poorly growing or unhealthy plants, which might end up dropping a substantial number of leaves.A fungal attack causes

Magnesium is needed to give leaves their green colour, so when there's a deficiency, yellow breaks through between the veins and around the leaf edges instead. Other colours, such as purple, brown or red, might also appear. Older leaves suffer first, and will die if they're not g...

Carol Klein explains how to create the optimum soil conditions for growing camellias.With hints on environmentally friendly, acidic soil conditioners and guidance on spotting garden pest and signs of ill health, Carol offers a comprehensive guide

While you can't take cuttings from rhododendrons, there is a much simpler technique you can try - layering. Do it over the summer and by the following spring you'll have the beginnings of many new rhododendron plants.Established rhododendron plant

Layer a rhododendronRhododendrons are beautiful shrubs but they come with a less than attractive price tag. A simple propagating technique called layering is a great way to get more plants without breaking the bank.Pick off rose leaves infected

with low-growing stems can be propagated by layering, such as honeysuckle, mock orange (Philadelphus), rhododendron, magnolia and forsythiaDig up and divide clumps of winter aconitesPlant new shrubs and hardy perennialsCut away old foliage on Christmas

and rhododendrons, taking care not to damage developing new leavesSow seeds of fast-growing hardy annuals, such as escholzia or poached-egg plant, to fill gaps

Use secateurs to remove suckers growing from the stems of standard rosesTie tall border plants like delphiniums to their supportsFinish planting out dahlias, cannas and summer beddingCut back dead and dying foliage on spring bulbsDeadhead camellias

A fungal disease weakens the plant and can seriously reduce its flowering performance. The brown spots eventually grow together and develop grey centres. Infection is caused by air or water-borne spores entering the plant through damaged leaves

.Promptly pick off and destroy affected leaves. If leaf spot is a persistent problem, try growing your primulas under glass.Spraying with myclobutanil may help give some control, although they're not specifically labelled as a solution for primula leaf spot