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Here's the answer to your Plant Problem...

You asked:

What is causing white mould on the base of my salad onions?

Our Advice:

This is white rot, a soil-borne fungus that can last 8-10 years in the soil. You risk losing plants if you grow onions, leeks, garlic or chives in this area. Always cultivate this area last to avoid spreading the disease around on your gardening tools.

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