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how to grow a cannabis plant in a greenhouse

How to grow a cannabis plant in a greenhouse

Typically, young plants and seedlings tend to react better to slightly more moist environments – around 60 to 70 percent is right. As the plant matures, it’s best to slightly dial down the humidity, shooting for around 40 percent by the time your plants are fully flowered (around week nine).

Typically, growers should aim to keep their cannabis greenhouses around 70 to 80 degrees – not too hot, but warm enough to keep your plants happy. Typically, the heat provided by the sun through your greenhouse covering – combined with the natural heat given off by the plants as a result of the greenhouse effect – should be plenty to keep your plants warm during cold weather.

So you’ve set your greenhouse to provide the ideal growing environment, you’ve spaced your plants out perfectly to give them plenty of room, and you’re on top of your growing and trimming schedule. Everything is growing great with your cannabis grow – until one day you walk out to your field to find all your hard work has been heisted.

Humidity Controls in an Artificial Indoor Grow Room

In extremely cold locations, it might be advisable to equip your cannabis greenhouse with an excellent greenhouse heating system, which can carefully control your greenhouse’s interior and raise the heat as needed. Likewise, proper cooling and ventilation can be critical to preventing heat buildup during the warmer months. Determine your needs based on the climate in your location and plan your grow space accordingly – your plants will thank you for it.

Those who choose to grow cannabis without the protection of a greenhouse may luck out on temperature, since plenty of plants manage to thrive and survive unprotected in the open air. But when it comes to produced the best cannabis possible, there’s one critical element that’s arguably just as important and significantly harder to control: humidity.

Ideal Temperature Control for your Cannabis

For both experienced and brand-new cannabis growers, a cannabis greenhouse offers the chance to provide cannabis plants with the ideal environment to produce the perfect grow. Here’s a look at just what a greenhouse can bring to your cannabis crops:

For growers looking to get started with a high-value, high-yield, and highly rewarding grow, cannabis will likely be the big trend in years to come. That’s because laws and attitudes toward cannabis have been in flux for years now, and with greater acceptance comes a new avenue for growers to succeed and find profitability. Combine this with the ideal conditions of a cannabis greenhouse and you’ve got a powerful money maker contained in one easy location.

How to grow a cannabis plant in a greenhouse

Many outdoor cannabis growers eventually upgrade to greenhouse growing. The greenhouse allows more potent crops, higher THC levels and a better terpene profile due to the protection offered by a greenhouse. Whether you are growing with a large commercial budget, or a small greenhouse with just one or two plants, the quality improvements are always important and appreciated. Because greenhouse grown cannabis plants grow in a more sheltered environment the plants are healthier, enjoying more optimized conditions. The plants can grow without damage from extreme cold, storm/hail damage and wind damage. Pests and disease are easy to prevent and deal with in a greenhouse. A greenhouse protects your plants from the worst of the weather, hail and torrential rain. Greenhouses protect your plants from cold weather, creating a warmer environment where your buds can ripen and mature under conditions which are often far superior to outdoor weather.

Anyone that has been in a greenhouse on an early spring day will note how quickly they warm up in sunshine. This allows growers to get their preferred cannabis seed varieties started earlier in the season than they could outdoors. This allows the growing season in a greenhouse to start earlier. Your greenhouse will therefore benefit from larger plants and subsequently superior harvests. Cold nights can be mitigated with the use of greenhouse heaters that are available to purchase at any garden centre.

One problem with greenhouse growing is that the temperatures can get very hot in sunny mid-summer weather. High temperatures make it difficult for the plant to grow. Leaves may wilt and the roots can find it difficult to provide sufficient water. This can be a serious problem, especially in a heatwave when temperatures inside the greenhouse can be in excess of 30ºC or even 40ºC. At these temperatures the cannabis plant struggles since conditions are so far from optimum. But the determined greenhouse grower can find ways around these challenges.

With a little bit of thought and planning, growing cannabis seeds in a greenhouse can be a safe, secure and pleasurable way for the home-grower to be self sufficient in recreational or medical cannabis. Greenhouse-grown cannabis is incredibly potent when grown from good cannabis seeds. It’s no surprise that more people than ever are growing in greenhouses and enjoying the benefits.

Growing cannabis seeds in a greenhouse with artificial lighting

Ensuring air movement and regular air changes in your greenhouse is important. Some of the techniques used to keep your greenhouse cool will also reduce humidity. Having adjustable roof vents which can open to release humid air is a great help. Having a through-draft thanks to an open greenhouse door is also a good idea.

Plants that are rooted directly in the ground obviously can’t be moved, but will survive well even when you are away for a week or two. There is less need to worry about daily watering. If your greenhouse contains good quality moist soil then your cannabis plants will establish an extensive root network which will support a large plant with heavy yield potential. However, if the ground under the greenhouse contains poor quality soil then remove it and replace with good quality soil before growing plants in it. Serious greenhouse growers will dig in plenty of manure and compost at the end of each growing season to ensure optimized soil quality for the following years crop. One advantage of rooting your plant directly into the ground is that you can grow very large plants with unrestricted root space. It’s one way to get XXL harvests. Some greenhouse growers, when using the best cannabis seeds, find that a single plant can occupy the entire greenhouse and occasionally even run out of space. If this happens you can try low stress training to tie down the taller branches. In extreme situations, some growers have even had to remove some roof panels from their greenhouse if the plant grows uncontrollably. Plants which are rooted directly into the ground can be grown using automated feeding systems such as dripper systems etc.

Many greenhouse growers also arrange a hosepipe/water connection near their greenhouse. This simplifies the process of getting water to your plants. The last thing you need on a hot day is numerous long walks from your house to the greenhouse with a watering can.

How do I get rid of excessive greenhouse humidity?

The experienced grower can use the benefits of a greenhouse to grow larger plants, with improved quality and a longer life cycle. Plants can be started earlier and harvested later thanks to the extra protection offered by the greenhouse. During the cultivation process the conditions inside a greenhouse are better than those outside, promoting improved plant health, superior yields and better potency. Outdoor grown plants, without these benefits, usually offer lower yields and quality.

Of course this type of extravagant growth rarely occurs when cheap cannabis seeds are grown in poor quality conditions with badly prepared soil. Growing a monster plant requires properly dug, well prepared nutritious soil at the start of the season. The pictures show large cannabis plants simply outgrowing the greenhouse, delivering heavy harvests for the grower. The Dutch Passion Shaman variety was bred specifically for outdoor/greenhouse conditions. Shaman combines some incredibly potent skunk/purple skunk parents with vigorous growth. Shaman eventually grew into a bush 3 metres tall and two meters wide, winning the Dutch Passion photo contest award in 2006. In this case the grower was forced to remove a pane of glass from the greenhouse as his resin soaked Shaman outgrew the tall greenhouse. The plant was too strong to be tied down, and security was not a problem on this particular grow so the grower went on to harvest an abundance of top quality greenhouse grown cannabis, despite the obvious size problems of the Shaman.