Garden Q&A: Could anti-fly spray be causing my lupins to die?

Whether you're a gardening beginner or expert, Irish Examiner columnist Peter Dowdall has the answer to your questions

Lupins flourishing in summer at Lake Tekapo, New Zealand. Picture: iStock

What has happened to my beautiful lupins? All of a sudden they began to die, about a fortnight ago, and I don’t know why. They were flourishing, with new flowers ready to take over from the ones I needed to cut. I use an anti-fly spray on them to protect them, but it has never adversely affected them before. 

ANSWER