On 2009-05-09 17:44:34 +0100, "Ragnar" said:

Thank you everyone for your replies. I agree with your diagnosis of
Leycesteria as there is a mature bush not far away and I now notice other
seedlings beneath it. I wonder how it got into my Lemon tree?

As you said - seeds. It's extremely generous in that respect!
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Sacha
www.hillhousenursery.com
Exotic plants, shrubs & perennials
South Devon