The ivy at Wrigley Field turns green about mid-May. Until then, the ivy is brown.
Wrigley Field wall
Ivy
1939 by Bill Veeck
Wrigley Field
Boston Ivy
It might be so that the batters don't lose their vision of the ball after it is thrown by the pitcher.
Yes, English ivy can grow in water, but it may not thrive as well as it does in soil.
anywhere
no
English ivy can grow in water indefinitely as long as it has the necessary nutrients and conditions to thrive.
Yes
Yes