Above‐ and below‐ground competition cues elicit independent responses

Summary Plants sharing pots have been observed to show more allocation to roots than do solitary plants, even when resources per plant are constant, indicating plasticity to root neighbours. Lowered red to far‐red ratio (R : FR), a cue of above‐ground competition, is known to cause increased stem elongation and decreased allocation to roots. In nature, however, cues for above‐ and below‐ground competition are likely to be experienced …