Answer:

FIRS

Answer	Crossword Clue
FIRS	Some Christmas trees
FIRS	Mountain pines
FIRS	Christmas trees

FIRS	Evergreens
FIRS	Cone-bearing trees
FIRS	Cone manufacturers
FIRS	Some cone producers
FIRS	Some evergreens
FIRS	Needle bearers
FIRS	Cone holders
FIRS	Holiday ball holders

FIRS	Christmas setups
FIRS	Fragrant evergreens
FIRS	Fraser and Douglas trees
FIRS	Douglas and Fraser
FIRS	Douglas and others
FIRS	Many Christmas trees
FIRS	Some are noble
FIRS	Christmas trees, often

FIRS	Christmas trees, frequently
FIRS	Pine family members
FIRS	Upland evergreens
FIRS	Certain evergreens
FIRS	Spruce cousins
FIRS	Cone makers
FIRS	Needle-bearing trees
FIRS	Cone bearers

FIRS	Tree line trees
FIRS	Balsam and Douglas
FIRS	Some pines
FIRS	Christmas buys
FIRS	They have cones
FIRS	Cone droppers
FIRS	Maine forest sights
FIRS	Christmas favorites

FIRS	Spruce relatives
FIRS	Holiday buys
FIRS	Evergreen trees
FIRS	Pines
FIRS	Plywood sources

Crossword

a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.