how to grow marijuana in a greenhouse

Of course, that means high tunnels cost significantly less than greenhouses. How much less depends on the options you are looking for. A variety of high tunnel greenhouse kits and traditional greenhouse kits are available for purchase. If you are handy and looking to save, you can also assemble your own high tunnel or greenhouse with some basic materials.

You can start with marijuana seeds or clones. Whichever you choose, pick the highest-quality stock you can find. This is no place to pinch pennies. Dealing with a reputable company and getting top-notch genetics will help ensure a bountiful crop that’s high in quality as well as quantity.

Greenhouse vs. High Tunnel

Once you have purchased or built your greenhouse or high tunnel, you’ll need to decide where to put it. Generally, a spot with southern exposure is best. This will provide a steady source of growth-inducing sunlight to your plants. You may also want to locate your high tunnel or greenhouse in an inconspicuous spot to deter thieves, vandals and other troublemakers.

To help you get on your way, DripWorks is happy to provide you some basic tips on how to grow marijuana in a greenhouse or high tunnel.

Growing Marijuana in a High Tunnel or Greenhouse

Many folks in northern latitudes start their seeds indoors in April under grow lights and transfer them to a greenhouse in May. Your own schedule will depend on your climate and growing season, of course.

How to grow marijuana in a greenhouse

As a new grower, don’t try to grow without sufficient light. Did you know that the plant yield is in direct proportion to the amount of light it receives? There are three types of lights:

Once the plant is flowering, the humidly needs to be lowered to 40-50%. This is considered critical by some growers. At this time you may lower the ambient temperature. With the lights on a good temperature range is 68 to 78.8 degrees Fahrenheit.

It’s tempting as a new cannabis grower to overwater your plants. Plants will droop and can drown and die in water. One simple way to know if the plants are dry is to stick your finder in the top inch of the soil and see if the soil sticks to your finger. If it does not stick, then it’s time to water.

It’s no surprise that heat from the lights will raise up the greenhouse temperatures to dangerous levels if you don’t have proper ventilation. In addition you will need proper inlet air coming into the greenhouse. One way to accomplish this is with one fan bringing air into the greenhouse, and one sending the air out of the greenhouse. The total airflow into the greenhouse affects the humidity.

pH Level for your cannabis in your greenhouse

It has been said that new cultivators are apt to harvest the crop too early. If you harvest too early, when the trichomes are still clear, the THC will not be as strong. Ideally one should wait until a more milky color has filled half of the trichome heads.

As a grower it is important to monitor the pH levels of the water you use to feed your plants. pH is the measure of how “acidic” or “alkaline” something is on a scale off 1 to 14. “7” is considered neutral. Small sickly buds may be the result in part of improper pH levels. A cannabis grower can measure the pH of water sample using a special p tester drops or a digital pH pen. When the pH is within the correct range, the plants can get the most out of all the nutrients, and their buds will reflect it. If the pH at the roots is too high or low, the plant can’t properly absorb the proper nutrients.

Humidity and temperature affect each other. When it is warmer, warm air hold more water than cold air. For cannabis to grow nicely the temperature and humidity levels need to be in an ideal range for the plants to thrive. When the plants are in the seedling stage the humidity can be between 70% and 80%. Some growers will tell you that seedling and clones prefer the level to be from 65-70% humidity. The high humidity is necessary because the roots are not yet developed, and the plant will take in water through its leaves.

Monitor the Temperature and Humidity in the Greenhouse

One to two weeks before the harvest, consider bringing the humidity levels down as much as possible in the 30-40% range.

So you are growing cannabis in a greenhouse. Most of this information is nothing new unless you are new to cultivating cannabis. Here are a few recommendation to stay on top of during your cannabis growing adventure.