by Jorge Cervantes
Before Harvest
Pungent marijuana odors are often a problem around harvest time. To minimize odors keep the drying and trimming room well ventilated so fragrances do not linger. Keep rooms cool, below 70F so essential cannabis oils release few pungent aromas. An air conditioner works well to keep odors t a minimum in sealed rooms. A carbon filter will remove odors in the drying / manicuring room and will also treat expelled air.
Irrigate with plain water or clearing solution to remove residual fertilizers in foliage and soil. Give plants plain water the last 7 – 14 days before harvest. Make sure to let 10-20 percent of the water drain out the bottom of containers. Clearing solutions remove fertilizer residue faster and are used the last few days before harvest.
Change the nutrient solution to plain water in recirculating hydroponic systems 7-10 days before harvest. Continue to top off the reservoir with “fresh” water until harvest, or use a clearing solution as per directions.
Give plants total darkness for 48 hours just before harvest so that more resin develops on buds.