Thompson & Morgan

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Blackleg - Diseases


Commonly asked question(s):

- Why are my pelargonium cuttings going black at the base?


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.



End of season plant sale