Advanced greenhouses can allow you to grow year-round by controlling light. They can provide supplemental lighting when it’s too dark outside and they can block out all incoming light if it’s too light outside.
Cannabis generally goes in the ground outside between April and July, when the sun is out for most of the day. This keeps plants in the vegetative stage.
Solar radiation (energy from the sun) passes through the transparent walls of a greenhouse and heats up soil and plants, keeping a greenhouse warm even when the outside air temperature is cold.
Greenhouses are a great, inexpensive way to cultivate cannabis. They harness the power of the sun, provide a warm climate, and protect gardens from harsh environmental conditions.
In turn, soil and plants release energy as infrared radiation, which can’t escape the greenhouse, so the trapped heat warms the air.
Advantages of Growing Greenhouse Cannabis
Supplemental lighting allows the grower to extend the hours of daylight and to improve the quality of light on overcast days. This will give you more control over the vegetative state of your plants.
Controlling your greenhouse climate is essential to producing a quality product. Some greenhouses have windows or paneling that can be opened or removed to either allow for wind circulation and to cool plants, or to trap in heat.
Aside from rain, humidity is rarely an issue outdoors as there will always be a nice breeze. But in a greenhouse, excessive humidity can quickly lead to an unhealthy growing environment that facilitates mould and bud rot.
Aside from offering protection from wind, rain, and frost, a greenhouse has a lot of other benefits. For example, you can equip your greenhouse with artificial lighting to take advantage of grow lamps and natural sunlight. This way, you can control a plant’s vegging and flowering phases as if you were growing indoors. Moreover, if you set up a small greenhouse on your balcony or terrace, it can be a good way to keep suspicious odours and noise from being an issue indoors.
By supplementing your grow with artificial lighting, however, you no longer need to follow the outdoor grow season if you choose. Instead, you can calculate an ideal sunlight/grow-light schedule to capitalise on the free power of the sun, while benefiting from the control offered by grow lights.
• Natural sunlight
CONSIDER HEAT AND HUMIDITY WHEN BUILDING YOUR GREENHOUSE
When growing feminized photoperiod strains, you have the choice to use exclusively natural sunlight, or you can supplement with artificial light. If you grow in natural sunlight only, your plants will essentially have to follow the regular outdoor grow season schedule. At the end of summer, plants will start to flower, and then you can harvest sometime in autumn. Luckily, the controlled conditions of a greenhouse can support flowering deeper into fall, which is a major benefit for sativa growers especially.
The location of your greenhouse will ultimately determine how much sun your plants receive. Obviously, you don’t want to place your greenhouse behind your house in the northern part of your garden where your plants never get any sun. The best location is the south or southeast side of your house.
Another important consideration: Is a water connection and drainage nearby? You don’t want to be lugging buckets of water to your plants or draining the runoff into the middle of your garden. Having water and drainage available is also important if at some point you decide to automate your system or implement hydroponics. Some hydroponic systems may require changing the tank every few weeks. If your greenhouse is on your balcony and there is no way to empty or fill the tank, short of carrying the tank into your house bathroom, this could be an issue.
BENEFITS OF GROWING CANNABIS IN A GREENHOUSE
A greenhouse provides the best attributes of both indoor and outdoor cannabis growing. But don’t think that building your own greenhouse means a difficult or expensive endeavour. A simple greenhouse doesn’t cost much, and all you need is a suitable space in your garden or on your balcony to get started growing cannabis like a pro. Read on to learn how to grow cannabis easily, and successfully, in your own greenhouse!
You can build and purchase greenhouses of virtually all sizes, from simple mini-greenhouses to custom-built, full-fledged extensions for your home. You can find greenhouses consisting of a transparent PVC sheet over a metal or wooden frame, some that use polycarbonate plastic panels, and others made from glass. Some types of greenhouses are designed to be situated against a wall of your home so the heat keeps the greenhouse warm.
Size and panel opacity: Aside from type and material, two other greenhouse considerations are size and panel opacity. When deciding on size, think about what strains you might want to grow and how tall they might get. A good general rule of thumb is to get a larger greenhouse than the one you think you’ll need. If you don’t need the extra room for equipment and maneuverability, you can always add more plants. As for panel opacity, clear might seem like the best choices but the sun beating down on your cannabis plants can lead to competition in young plants and hot spots later. Diffuse or semi-diffuse panels provide ample, even light, preventing hot spots, competition, and uneven growth. All that should equal better yields.
Whether it’s a simple walk-in greenhouse or something more elaborate, check local laws to see if building permits or other formalities need attention before you start building.
Soil: First and foremost, invest in top-quality soil as this will impact the entire growing process. Pick a nutrient-packed soil that contains organic substances like compost and worm castings. Pay attention to the pH levels of the soil as well — aim for a range of 5.8 to 6.3. Other qualities to look for in soil include good drainage ability, high oxygen levels, and effective water retention. You could also make your own super soil.
Attached greenhouses: These are usually shaped like a house and attached to the existing wall of a house, garage, shed, or barn. This greenhouse option is made of metal or wood framing with glass, fiberglass, or plastic panels. While they might be slightly less expensive than free-standing greenhouses because one wall is already built, the location of attached models is dictated by the location of the existing structure. Prices vary greatly depending on location, size, and construction materials.
Growing marijuana in a greenhouse
In this guide, you’ll learn why growing marijuana in a greenhouse can be effective and how to get started.
If DIY is not your style, think about your budget and how many plants you’ll want to grow then decide how much space you’ll need for plants, climate control, and the rest of your greenhouse setup. Armed with that information, consider the options below.
Whether you want to grow recreational weed or medical marijuana, the best greenhouse may be one that you build yourself. If you have the time and skills (or helpers) to construct your own greenhouse, this route will be the most cost-effective.
Building a cannabis greenhouse
Free-standing greenhouses: From a simple walk-in greenhouse with room for a couple of plants to the massive connected behemoths set up by commercial growers, free-standing greenhouses are what most people picture when they think of a greenhouse. They are apex shaped, like a house, and consist of metal or wood frames and glass, fiberglass, or plastic panels. Many have roof and/or side panels that open to allow for ventilation. This may be the most expensive option, but it also has the most room for plants while still allowing for location flexibility so growers can move it to best capture the sunlight. Inexpensive free-standing models start at less than $100 but they may not be very durable. Sturdier models cost closer to $1,000 and prices go up from there.
A marijuana greenhouse also puts you in control of two primary factors in successfully growing marijuana plants.