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Blackleg - Diseases

Blackleg - Diseases

Blackleg - Diseases

Why are my pelargonium cuttings going black at the base?

This sounds like Blackleg which is unfortunately a common problem with Pelargonium cuttings. It’s caused by a micro-organism which is spread by using unwashed pots/trays or tools. Using water from a source other than mains water can also cause this.

The only way to prevent it is to sterilise everything the cuttings will come into contact with - pots, trays, secateurs etc. Make sure you use sterilised compost from your local garden centre and it wouldn’t hurt to dip the cuttings in a rooting hormone which contains a fungicide too. Make sure the soil isn’t too moist as the disease will thrive in these conditions.

Dispose the affected cuttings with normal household waste to prevent it spreading.

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Sue Sanderson T&M horticulturalist

Written by: Sue Sanderson

Plants and gardens have always been a big part of my life. I can remember helping my Dad to prick out seedlings, even before I could see over the top of the potting bench. As an adult, I trained at Writtle College where I received my degree, BSc. (Hons) Horticulture. After working in a specialist plantsman's nursery, and later, as a consulting arboriculturalist, I joined Thompson & Morgan in 2008. Initially looking after the grounds and coordinating the plant trials, I now support the web team offering horticultural advice online.

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