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22 October 1994
From JOHN LEONHARDT, M.J. BULL, RALPH HOWLETT, JILL CRAMPHORN, ROBIN OAKLEY-HILL and DAVE RICHARDS
The runner beans in my Hertfordshire garden always grow round their canes in the sequence east, north, west, south. This creates a right-hand-thread helix (anticlockwise if viewed from above) and is the reverse of the Sun's movement in the sky. Right-hand threads are also formed by greater bindweed, contrary to Derrick Grover's observation (Feedback, 17 …