How does one get rid of the greenfly?? They are going through my once beautiful hanging baskets, and destroying them. I have tried organic insecticide, washing up liquid spray, no difference. Is there anything else I can try? Are they likely to spread to other plants in the garden? They started on some Lupins which were completely destroyed - and they were quite a distance away from the current invasion.
thanks for any help or advice.
Peelabee