You also have to watch humidity, because every time you water plants in a small space, you’re going to get high humidity. It should be below 50 percent to prevent bud mold or rot.
In addition, because you aren’t growing the plants outside where carbon dioxide is abundant, you must supplement the indoor air with it. Many small-time growers use CO2 tanks (similar to those on a soda fountain machine) with a regulator valve. You can get these tanks from grow stores or beverage suppliers. You can also buy automatic controllers for the tanks that release CO2 at the ideal ratio of 1,250 to 1,550 parts per million.
Q: This is not something somebody who’s not fully committed should do, is it?
A lot of people use hydroponics, where plant roots are free flowing in what is essentially a circulating water bath. But that can be a problem for inexperienced growers, because if you accidentally add too many nutrients to the water, you can burn or kill the plants because the roots suck the extra nutrients right up. Soilless media act as a buffer to protect the roots.
As a cultivated plant, cannabis still responds to light changes. Depending upon the strain you’re working with as well as your environmental demands, your light-to-dark ratio will vary a bit. If you’re new to the strain (or growing), talk to old hands about when to end the vegetative phase and trigger your plants’ flowering phase. That timing is critical to maximizing your yield. Here are some more specifics.
What many growers don’t realize is that cannabis demands an uninterrupted dark cycle. Just as your good REM sleep would be interrupted if a light popped on at 2 a.m., cannabis doesn’t fare well when any light disturbs it during its dark “sleep” cycle. The moon and stars don’t bother cannabis, but any artificial light can stop its bud growth. In fact, light interrupting its dark cycles can make cannabis so stressed and irritable that it can lead to hermaphroditism. That can pollinate females and ruin your plants.
How Much Darkness is Needed?
Americover’s BOLD® Black Out Light Deprivation Tarp is the top-selling greenhouse cover of its kind nationwide, consisting of two sheets of high strength virgin polyethylene film laminated together with a third layer of molten polyethylene. The cover is scrim reinforced for superior tear resistance. Plus, the cover can be easily set or lifted with the BOLD EZarm Tarp Puller. The BOLD EZarm allows one person to easily cover and uncover a greenhouse without additional help, making the daily chore of light deprivation so much easier.
Keep to Your Chosen Schedule
When you are ready for your cannabis plants to flower, a 12-hours of light and 12-hours of darkness schedule is standard. Nighttime provides darkness, keeping cannabis on somewhat of a natural clock. This is why indoor growers need to make a deliberate effort to not only create long, bright days but also emulate dark cycles for cannabis to grow large full buds.