The water won't reach the roots.
Plants do grow better upside down, but first you have to grow them right side up.
no because when plant grow upside down it will die
yes, it might because plants grow in any kind of water, but it has to be clean. Also, if you talk to plants, it helps them grow.
No. Plants are designed for the roots to grow in the direction of gravity and the leaves to grow against gravity. A plant grown upside down will adapt by curving its stem upwards again.
Yes they do grow down, they can also create 'suckers' that are self rooting side plants
No it can not because it has sugar and caffeine. Water might grow it back, though.
To grow exotic plants (plants not meant for your climate)
If we had no precipitation plants might not grow.
It supports its grow
You can try but the plant will try to grow upwards. All plants grow up and their roots grow down. This is coded in their DNA.
Break down of sugar by photosynthesis
Most plants have roots that grow both vertically and horizontally to varying degrees. However, taproots such as carrots and radishes primarily grow downwards, as do fibrous roots of grasses. Deep-rooted plants like oak trees and dandelions also have roots that grow predominantly downwards.