GR E AT A ME R IC A N ME DI A SE RV ICE S
gpn
GREENHOUSE PRODUCT NEWS
W W W.GPNMAG.COM
2018
PRINT MEDIA KIT
the magazine for commercial growers
WHAT'S NEW WITH GPN?
Innovations in Lighting Special Section
Controlled Environment Agriculture Supplement
Guide to Cannabis Production
New Cannabis Channel on gpnmag.com
