Here's a way to grow plants vertically using limited space and water. It also allows seedlings to get up high into the sunlight, outwitting the aggressive invasive species in the yard, if you have them like I do.
You could make a flowering fence with these if you were so inclined.
I got the initial idea for this instructable from this one called "bottle towers
". However, mine are a little different in that they are free-standing and have a wicking system