How to use CO2 for Optimal Cannabis Cultivation (2024)

FAQs

How to properly use CO2 in a grow room? ›

You simply hang slow-release CO2 bags or bottles in your grow room. Carbon dioxide is slowly released over time. The bags we sell are Exhale CO2 Bags & TNB The Enhancer Bottles, which are self-activated. This means they don't start releasing gas until they're in your grow room - there's no CO2 waste!

What CO2 level for cannabis stages? During the vegetative stage, CO2 levels should be maintained between 1000-1500 ppm, and during the flowering stage, between 1200-1500 ppm for optimal results.

It is critical that when you supplement CO2 to your crops you do so within the first 2-5 weeks of flowering. Assuming your light, heat, water and nutrients are fine-tuned, his can boost overall crop size by 20-25%.

In generalcondition(~400 ppm), the optimal growth temperature for weed is around 26- 27 °C (78 -80 °F). At high CO2 levels (over 1,000 ppm), the maximum receptive temperature is up to 36°C(96 °F), and at this temperature, the rate of photosynthesis peaks.

Increase Plant Growth

On reason why growers artificially increase CO2 in grow rooms is to increase plant growth rates and overall biomass. But some scientific studies have found that growth rates can increase even more if CO2 is turned off at night and only artificially enhanced during the day (see Griffin et al 1999).

A grow room works wonders as it traps everything inside, controlling the area for your plants, but dangerous levels of CO2 can lead to serious health problems for humans. When CO2 levels climb to 5,000 ppm problems such as toxicity or oxygen deprivation can occur which is more exposure than we are used to.

Basically CO 2 works by multiplying the plants'cells much faster. If you use extra CO2 during the flowering period when growing cannabis indoors, combined with the right amount of lighting (at least 12 hours of light), you'll get buds that are much thicker than usual and the obtained yield will be bigger.

If you are using higher intensity grow lights, such as HIDs, LEDs, or CMHs, you will benefit from CO2 supplemenation. But, if your grow light is not powerful, and thus the "limiting factor" in your grow, adding CO2 won't do much. T5's and CFL's are great for propagation, or supplemental lighting.

An increase in ambient CO ₂ to 800-1,000 ppm can increase yield of C3 plants up to 40%-100% percent and C4 plants by 10%-25% while keeping other inputs at an optimum level. Plants show a positive response up to 700 to need of 1,800 parts per million, but higher levels of CO ₂ may cause plant damage (Figure 1).

After the initial weeks of the flowering stage, it is recommended to stop adding CO2 as there is no evidence to suggest that additional CO2 provides any benefits during this stage. Be sure to gradually decrease the ppm for cannabis over a few days to avoid shocking the plants.

Do plants absorb more CO2 at night? ›

So, plants take in carbon dioxide from the atmosphere for preparing food. At night, photosynthesis does not occur hence they take in oxygen and give out carbon dioxide. Therefore, it is said that during the daytime, plants take in carbon dioxide and give out oxygen, and during the night it is vice-versa.

However, above 2,000ppm CO2 becomes toxic to plants, and above 5,000ppm CO2 becomes potentially harmful to people. Most experts agree that 1,500 ppm is the maximum CO2 level for maximum plant growth, although any CO2 level between 1,000ppm and 1,500ppm will produce greatly improved results.

Numerous studies found that the CO₂ fertilization effect can enhance vegetation growth, however, some recent studies showed that the increase of vapor pressure deficit (VPD) could reduce vegetation growth due to an increase in surface resistance.

Managing grow tent heat is one of the more difficult, frustrating aspects of indoor growing. Not too hot and not too cold; many of the plants we grow are just like us and prefer similar temperatures - between 65 to 85 degrees Fahrenheit.

However, the downside to a sealed grow room is that it creates a potential safety hazard for growers working in these conditions. Because CO2 is heavier than air or oxygen it will “settle” at the floor first, then rise up until it fills a room.

Photosynthesis Enhancement: With higher levels of carbon dioxide, plants can perform photosynthesis more efficiently. In fact, this allows them to better use available light and produce more energy for growth and yield.

tank should theoretically last 44 days (175/4), while the 5lb. tank will last about 11 days (44/4). These estimates do not take into account plant uptake of CO2, opening doors or curtains, or other opportunities for CO2 to escape and require replenishment.