humidity for cannabis

Moisture droplets on leaf

Water Vapor in Grow Rooms: Moisture, and How to Measure It – Part II: Grains per Pound (GPP)

Relative humidity fluctuates with temperature, but Grains per Pound (GPP) provides an absolute measure of moisture in your grow room. By understanding the actual weight of water in the air, you can precisely manage your dehumidification and irrigation needs to provide optimal conditions for your crops. Learn how GPP improves your climate control strategy.

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Green leaf with powdery white mildew spots and visible veins.

Control Humidity to Best Fight Powdery Mildew

Powdery mildew thrives in high moisture environments, posing a major threat to crops. Instead of relying on pesticides, focus on environmental control. By maintaining relative humidity at 50 percent or lower, you can prevent mold at the source. Properly sizing a commercial-grade dehumidifier to match your plant transpiration rates is the most effective defense.

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Quest 110 Dual dehumidifier mounted in a warehouse, with reflective panels and lighting fixtures surrounding it.

For Robust Plant Growth Maintain Proper Humidity Levels

Proper humidity levels are essential for healthy plant growth and high yields. When air is too dry, plants may suffer from nutrient burn, while excessive moisture encourages mold and fungal infections. Discover the ideal relative humidity ranges for every stage of your garden, from seedlings to flowering, to ensure your plants thrive throughout their lifecycle.

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