The Best of Both Worlds: A Grower’s Guide to Greenhouse Cannabis
So, you’re thinking about growing in a greenhouse. Let me give you the simplest and truest way to think about it: a greenhouse is an indoor grow that’s powered by the free, unmatched energy of the sun.
You get the protection and control of an indoor setup combined with the power and full spectrum of natural sunlight. It’s the best of both worlds, and it can produce some of the absolute highest-quality cannabis you’ve ever seen. But, like any technique, it has its own set of rules you must respect.
Recommended Strains
Amnesia
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THC: 15% - 20% -
Type of seed: Feminized -
Phenotype: 70% Sativa / 30% Indica -
Flavor: Fruity, Incense, Woody -
Day to flower: 8 - 10 weeks
Amnesia Auto
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THC: 10% - 19%
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Type of seed: Autoflowering
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Phenotype: 70% Sativa / 30% Indica
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Flavor: Fruity, Spicy, Sweet
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Life cycle of: 10 - 12 weeks
Your #1 Enemy in the Greenhouse: Humidity
Listen to me. Your biggest enemy in a greenhouse is not pests, and it’s not the cold. It’s stagnant, humid air. A greenhouse is designed to trap heat and moisture. This is great for the vegetative stage, but during flowering, it’s a recipe for disaster. As the temperature drops in the cool of the early morning, that trapped humidity will condense on every surface, including your precious buds. This is how bud rot is born.
Your only weapon in this fight is air. Your greenhouse must breathe.
- You need vents and exhaust fans to be constantly moving air.
- You must give your plants more space between them than you normally would. Crowding plants in a greenhouse is practically begging for a moldy, heartbreaking harvest.
Promos & Deals
The Pro-Level Greenhouse Rules
If you want to succeed, these aren’t suggestions; they are non-negotiable rules of engagement.
1. Screen Your Vents.
You’ve got your vents open for that crucial airflow. Fantastic. You’ve also just hung up a giant “All You Can Eat Buffet” sign for every bug and bird in a five-mile radius. You absolutely must cover every single opening, every vent, every door you leave open, with a fine mesh screen. This gives you the life-saving air without the garden-destroying invasion.
2. The “No-Touch” Rule.
This is a simple rule that will save your colas. Any branch or bud that is constantly touching the plastic or glass wall of the greenhouse WILL rot. It’s a guarantee. The condensation that forms on the inner walls will soak that part of the plant and create a pocket of decay. Keep your plants pruned, trained, and centered, away from the walls.
The Perfect Plant for the Greenhouse
So what’s the perfect type of plant for a greenhouse environment? For many growers, the answer is the autoflower.
Why? Because autoflowers love stability. The greenhouse protects them from the worst of the weather swings, violent winds, heavy rain, and light frosts, giving them the consistent and gentle environment they need to truly Thrive. Plus, their fast life cycle means you can often pull off multiple harvests in a single extended season. It’s a match made in heaven.
When you Cultivate this way, you’re harnessing the sun’s power while protecting your plants from nature’s wrath. You’re creating the perfect, controlled environment to Nurture your Homegrown cannabis to its absolute genetic potential.
Frequently Asked Questions
What is the biggest challenge when growing cannabis in a greenhouse?
Humidity and lack of airflow. A greenhouse naturally traps moisture, which can lead to condensation and, ultimately, bud rot during the flowering stage. Constant air circulation from fans and vents, as well as proper spacing between your plants, is absolutely critical.
Why is it so important to put screens on my greenhouse vents?
Because open vents are an open invitation for every pest in your area to come in and make a home. Aphids, spider mites, thrips, and even birds will see your greenhouse as a perfect, sheltered buffet. Screening all of your openings gives you the airflow you need while keeping the invaders out.
Why shouldn’t I let my plants touch the walls of the greenhouse?
Because the walls of a greenhouse are where condensation collects most heavily, especially in the morning. If a bud or a dense cluster of leaves is pressed up against that wet surface, it will become saturated with water and will almost certainly begin to rot.
Are autoflowers a good choice for a greenhouse?
They are a fantastic choice. Autoflowers thrive on environmental stability, and a greenhouse provides exactly that by protecting them from heavy wind, rain, and minor temperature swings. Their quick seed-to-harvest time also allows for the possibility of multiple greenhouse harvests in one long season.
