Do you want to grow buds coated in resin glands like the one we show in this article? Of course you do!!!

All phases of marijuana growth are important, but bloom phase is the phase growers focus on the most. There are specific things you must do during bloom phase to get your biggest buds with the most cannabinoids and terpenoids. And here they are…

Control Temperature & Humidity: Airy buds come from lights-on grow room temperatures above 78°F in grow rooms without added C02, and above 86°F in grow rooms with added C02.  Higher temps during marijuana flowering phase stresses plants by making them intake more water and nutrients, and to transpire more moisture out through the leaves.

I recommend a flush with pure reverse osmosis water that takes the place of a nutrients watering cycle every 2-3 weeks during bloom phase, starting in week three.

Hot temperatures create extra leaf transpiration, resulting in soggy buds that are ripe for gray mold. And if humidity is higher than 63% and especially if it routinely is above 63% when thick buds are on your plants, the buds can rot with gray mold, and growth slows down.

That’s one reason grow room humidity should be between 54-63%. Growers use dehumidifiers, air conditioners, and/or exhaust ventilation to control humidity.

Another tip: have your lights-off temperatures be 3-8 degrees cooler than your lights-on temperatures.

And use a chiller to keep your nutrients water at 68°F.

If you live in a very hot climate or are running a lot of lights in a small space, set your lights-on cycle so it corresponds with cooler nighttime outdoor temperatures.

Rotate your marijuana plants so they sit in different parts of the grow room sequentially. This can be difficult when you’re growing with joined buckets in deep water culture systems. But as much as possible, rotate individual plants on their axis, and rotate them around the room so they get light exposure from all sides over the course of marijuana flowering phase.

Try drought stress. This means skipping a watering cycle, but it doesn’t mean letting your root zones get so dry that your plants wilt. If you do a flush, and then let your root zones get drier than usual, and then do a feeding, your plants will get a big jolt of nutrition.

Feed carbohydrates in the form of Bud Candy, and also feed B vitamins throughout bloom phase until flushing.

Use pH Perfect hydroponics nutrients made by Advanced Nutrients. Not only are they made to boost cannabinoid production and harvest weight, they’re also made to manage root zone and nutrients water pH so your cannabis bloom phase plants can intake the nutrient elements they need at all times. Other brands of hydroponics nutrients have inferior pH buffering, or no buffering at all, resulting in wild swings in root zone and nutrients water pH.

Experiment with combination hydroponics lighting. Instead of running only high pressure sodium bulbs or orange-red LED during bloom, use metal halide or LED grow lights with more blue spectrum. Too much red in grow light wavelengths can cause internode stretch during bloom phase, leading to lighter, longer buds with less density, cannabinoids and terpenoids.

Increase root zone size a week before the beginning of marijuana flowering phase.

I used to believe root growth only happened in veg phase. But after several seasons of monitoring root size, I discovered that cannabis roots continue to grow at least into mid-bloom phase if not longer. I’ve seen root gains of 10-35% in density and size during bloom phase, with most of the growth taking place in early bloom.

When roots become constricted or want to expand and have no room to expand, your plants could feel stress, and not be able to take in as much nutrition, oxygen, and water as they need. I’ll transplant my cannabis plants from, for example, 7-gallon containers to 10-gallon containers a week before bloom phase.

As long as you don’t use the too-dense root zone media, or overwater (so that the bottom section of your larger container is overly damp or too full of nutrients salts), the extra capacity only has benefits.

And if you decide to re-vegetate those plants, the extra capacity will be very helpful.

Stay tuned to Growing Marijuana Perfectly, because we have plenty more success tips for bloom phase. We want you to grow your fattest, tightest, most potent buds ever!