![]() However, yellowing of leaves in large numbers may be caused by a wide range of factors too much or too little water, overpotting (i.e. It is normal for the odd lower leaf on a mature plant to yellow and fall. As the water gradually evaporates it increases humidity around the plant. low humidity) mist plants regularly (at least three times a day) or, better, place on a tray of damp gravel, expanded clay granules (Hydroleca) or recycled lightweight aggregate (Hortag). Add water, ensuring the level is always below the top of the gravel, clay granules or aggregate. Over-watering often causes browning in the middle of the leaves.Ĭontrol: Increase or decrease watering as necessary. They may also be a sign of too dry an atmosphere, or poor ventilation in a greenhouse or conservatory. Brown leaf tips or marginsīrown tips or margins to the leaves may indicate over or more likely under-watering, which can be assessed by checking the roots. Move plant to a cooler or shadier position as required. As brown leaves are a common symptom with more than one cause accurate diagnosis often depends on what other signs of ill-health are also present.Ĭontrol: Tip the plant gently out of its pot and check the condition of the roots. If roots are brown, rotted and soft consider whether you need to increase or more likely reduce watering. Leaves can also be bruised by passing pets and people. Whole plant collapse (where a plant suddenly turns brown all over and dies) may be caused by sudden changes in the environment, and in particular over-watering. Wilting and browning of leaves at the top of the plant are also a sign of underwatering. The upper leaves of shade-loving plants will often turn brown if they are placed in too much light. Where entire leaves turn brown and then fall, particularly the lower leaves, this is often an indication of underwatering and excessive heat. Symptoms, cause and control Leaves turn brown and fall Malvern Autumn Show - 22–24 September 2023.RHS Garden Wisley Flower Show - 5–10 September 2023.RHS Garden Rosemoor Flower Show - 18–20 August 2023. ![]() RHS Garden Hyde Hall Flower Show - 2–6 August 2023.RHS Flower Show Tatton Park - 19–23 July 2023.RHS Hampton Court Palace Garden Festival - 4–9 July 2023.Fluffy grey or white mould on the stems: This may be caused by Sclerotinia or grey mould ( Botrytis cinerea).See the link below for further details on Verticillium wilt. Wilting with staining inside the stem: This may be caused by the diseases Verticillium wilt and Fusarium wilt.Brown patches on the stems: Tomato blight can cause brown patches and decay on both the stems and leaves.Affected plants can wilt and die, and should be removed immediately to prevent infection of the remaining plants. Dead, rotten patches on the stems: A disease called Didymella stem rot (caused by the fungus Didymella lycopersici) can attack the stems of tomatoes causing brown, rotted patches, at any height but most often at the stem base.Tomatoes produce roots from their stem very easily, and this is usually no cause for concern. Lumps and outgrowths on the stem, usually near the bottom: These are likely to be root initials, which often cause alarm to gardeners, but are in fact harmless.
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