The following word, name, and phrases share a common property. Can you determine what it is?

LIMERICK
ELMER FUDD
TEA KETTLE
FIRE SALE
PLUMBER'S HELPER
A SHOT IN THE DARK

HINT:
It has to do with the beginning letters of each clue word.

Answer:

The first three or four letters of each clue spell the name of a tree:

LIMEerick
ELMer fudd
TEA Kettle
FIRe sale
PLUMbmer's helper
A SHot in the dark

Credit:
Lee Glickstein
TREETOPS