Plants grow UP

No matter which way you plant them, seeds grow with leaves up and roots underground.  Climbers like ivy, always reach for the top of a tree. Green beans always climb up their support, never down.  This one in my garden was heading down a support but changed direction and is now growing right back up on top of itself. It’s an effect called gravitropism, or tropism. The plant hormone auxin causes plants to repspond to [...]