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, assessing their intelligence and measuring their sensitivity to heat, cold and light. He breathed on them while chewing tobacco or cotton wool soaked in vinegar to test their sense of smell. He proved that they have no sense of hearing by shouting at them

, the sine qua non for any plant. The award was first introduced in 1922 and it means that this particular variety has been exhaustively tested by the Royal Horticultural Society. It has been grown in various conditions under the supervision of an expert