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Growing marijuana in a greenhouse is an increasingly popular option among both beginner and expert growers. It combines the best of indoor and outdoor growing: climate control from enclosed environments with natural sunlight and the potential for abundant harvests with less investment. If you’re thinking about starting, growing marijuana in a greenhouse is an excellent alternative. Here’s how to do it.
Why growing marijuana in a greenhouse?
Greenhouses offer an optimal space for growing marijuana because they allow you to control climate variables while the plants benefit from direct sunlight. This method is highly efficient, especially in regions with variable weather or short growing seasons.
Advantages of greenhouse growing
- Protection from bad weather: greenhouses protect plants from rain, strong winds, hail, and extreme temperatures.
- Optimal climate control: you can adjust factors like humidity, temperature, and light to support plant development.
- Higher yields: by combining sunlight with a protected space, plants tend to grow faster and produce more.
- Lower risk of pests and diseases: the enclosed space makes it harder for pests to enter and reduces the risk of infections.
- Cost savings: unlike indoor grows, greenhouses don’t require an expensive artificial lighting system, as they take advantage of natural light.
How to grow marijuana in a greenhouse
Greenhouse growing isn’t complicated, but it requires dedication and attention at every stage to ensure healthy plants and successful harvests. The steps are:
1. Choosing the space and greenhouse design
Start by choosing a suitable area to install the greenhouse. It should get plenty of direct sunlight throughout the day and offer good ventilation. Greenhouses can be made of plastic, glass, or other materials, and you can choose the one that best suits your needs.
2. Soil or substrate preparation
The success of your grow depends on having a healthy substrate. You can either plant directly in well-draining soil or use cannabis-specific substrates that contain the nutrients necessary for growth. Prepare the mix by adding nutrients and making sure the pH is correct (between 6.0 and 7.0).
3. Choosing seeds and germination
Choose high-quality marijuana seeds that adapt well to your climate and the space in your greenhouse. Germinate the seeds in a warm and humid environment to ensure proper sprouting. You can do this using the moist paper towel method until roots appear.
4. Transplanting seedlings
Once your seedlings have 2 to 3 sets of true leaves, it’s time to transplant them into the prepared greenhouse substrate. Do this carefully to avoid damaging the roots.
5. Temperature, humidity, and light control
Maintain stable temperatures of between 22 ºC and 28 ºC during the day and around 18 ºC at night. Humidity should range between 40% and 70%, depending on the plant’s growth stage. Although greenhouses take advantage of natural sunlight, you may want to use lights in the winter if needed.
6. Proper watering and fertilization
Water regularly, but avoid overwatering the substrate to prevent mold growth. Adjust water volume based on the plant’s growth stage. When fertilizing, use cannabis-specific nutrients, distinguishing between the vegetative and flowering stages to maximize yield.
7. Pest and disease control
Although greenhouses reduce the risk of pests, you should still watch for infestations. Use preventive measures like installing physical barriers, traps, or natural remedies to keep insects and diseases away.
8. Harvesting and drying
When the flowers are ripe, cut and hang them in a well-ventilated space to dry. Proper drying is essential to preserve quality and potency.
Best strains for greenhouse growing
Choosing the right genetics is key to success in greenhouse cultivation. Here are some of the most recommended strains:
1. White Widow
White Widow is an iconic cannabis strain that offers powerful effects and a distinct flavor. The high hits fast, starting with a cerebral rush that gives way to deep body relaxation. Its flavor is sweet with lemony notes and a metallic touch, making it a unique experience for the palate.
When grown indoors, it produces compact plants with dark green leaves, yielding up to 500 g dry per square meter in 63–70 days of flowering if given enough time to maximize resin production.
2. Green Gelato
Green Gelato by Royal Queen Seeds is a mostly indica strain (55% indica / 45% sativa) with strong vegetative vigor, resilience in all environments, and excellent performance after pruning. A cross between Sunset Sherbet and Thin Mint Girl Scout Cookies, this strain features a sweet citrusy flavor and high THC content close to 25%.
When grown indoors, 9 plants per square meter are recommended with 3 weeks of vegetative growth. After 9–10 weeks of flowering, yields of around 550 g/m² can be achieved.
3. Blue Dream
Blue Dream is one of the most iconic West Coast strains, known for its balanced 55% sativa genetics and relaxing psychoactive effects. A cross between Blueberry and Super Silver Haze, it was developed in California for therapeutic purposes like relieving pain, anxiety, and stress. It has 19% THC, delivering a smooth high that avoids paranoia and blends mental stimulation with calming physical effects.
Its flavor is a blend of blueberry with hints of candy, wood, and spice. Indoors, it’s highly productive, reaching up to 600 g/m² in 9–10 weeks using techniques like SCROG or lollipop pruning.
4. Northern Lights
Northern Lights by Royal Queen Seeds is a pure indica strain, originally from a cross of 11 unknown Pakistani seeds that resulted in sturdy plants with dense, frosty buds.
This strain is known for its strong, relaxing, and narcotic effects. Indoors, it grows to about 1.2 meters and delivers heavy yields, ready to harvest in just 8 weeks using the SOG technique.
5. Critical
Critical is a balanced strain that combines sativa euphoria with indica relaxation. It delivers an uplifting high ideal for social situations that gradually transitions into calm and sedation.
Its flavor blends lemony citrus with fruity and exotic notes, offering a full sensory experience. Indoors, the feminized version of Critical flowers in 56–63 days and yields between 500 and 600 g/m² with proper care and LED lighting.
Growing marijuana in a greenhouse is one of the easiest ways to cultivate year-round. By following these tips, you can achieve outstanding results.
