a young tree planted out in nursery rows and grown to suitable landscape size (also known as lining-out stock). Many sizes and methods of propagation are used.
Merriam-Webster Online Dictionaryliner (noun)
one that makes, draws, or uses - lines
a) a ship belonging to a regular line
b) an airplane belonging to an airline
- line drive
something with which lines are made
one that or is used to line or back something - lines