Thigmomorphogenesis is the response of plants to touch (thigmo is Greek for touch).
As plants follow the sun and brace themselves against the wind, they become stronger. This means plants grown in greenhouses tend to be taller and weaker than plants grown outside. To keep these overly protected plants healthy, many greenhouses use machines that knock the plants over, in different directions, several times a day. Cool, huh?
You can grow a surprising amount of food in your own yard. Ask me how!