A chance discovery by a Berkshire allotment-holder that a plant widely available in garden centres has the same effect on men as Viagra has been confirmed by experts at one of the world's leading botanical institutions.

The plant is winter-flowering heather, and botanists at the Royal Botanic Gardens, Edinburgh, many of them heather experts who have recognised the source of its active ingredient, now expect it to be the next must-have plant in British gardens. Demand is already high. Nurseries and garden centres in some areas are having trouble finding sufficient supplies as word spreads of the plant's unexpected properties.

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The latest gardening craze was triggered by a discovery by a 55-year-old furniture restorer, Michael Ford, on his allotment. He was always experimenting with drinks made from different plants and one day he tried an infusion from his winter-flowering heather. He said: "The effect was almost immediate. I had to stay in my potting shed for an hour or so before I could decently walk down the street."

He then contacted the Royal Botanic Gardens, Edinburgh, famous for their work with the heather family, to see if they could offer an explanation. They could. Botanist Alan Bennell said: "This first surfaced when East European chemists reported finding a Viagra-type chemical in the floral tissues of winter-flowering heaths. They were able to isolate measurable amounts of material that is an analogue of the active principle in Viagra."

You will now please note today's date. Erica Carnea does not have this particular medical effect, though it looks just lovely massed in beds.

A robot rights movement is taking shape and preparing the world's first ethical guidelines for human/robot relationships.

The "Robot Ethics Charter", which will be unveiled later this year, will insist that humans should not exploit robots and should use them responsibly. It is expected to be a version of the classic three laws of robotics developed by the science fiction author Isaac Asimov. These are that robots must not harm people, and that they must obey orders and protect their own existence unless either conflicts with the first law.