Why tickling empowers sensitive seedlings

Strokes of genius for strengthening young plants when they are at their most vulnerableIf you are a gardener, in April your windowsills will probably look just like mine: a jumbled mass of tray after tray of tiny seedlings crammed on to every surface available. As they grow they inevitably become increasingly closely packed, shading each other from the precious little light available at this time of year.A gentle tickle mimics the action of wind and passing animals, causing seedlings to grow sto