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. Infected foliage must be disposed of immediately, as the fungus can survive on the plant if left lying on the ground. The early, large-flowering varieties are most prone to attack, with smaller-flowering species (eg, C. montana) being the most resistant

pull them out if they appear in the garden. Every two weeks from early spring onwards spray plants with a systemic action fungicide.hollyhocks, mallowall year roundCommon fungal problems affecting plantsIris leaf spotRose blackspotRose rustTulip fire

There are many different fungi that cause this problem, each of which usually affects a particular plant or group of plants. In each case they produce similar symptoms. Affected plants will have discoloured leaves, often also distorted when young

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

, such as Sempervivum arachnoideum cristate, and the cockscombe celosia, Celosia argentea var. cristata.Misshapen and flattened stems, leaves and flowers.In most cases fasciation is temporary, so just enjoy it for its curiosity value. If it offends you, prune out