Best Humidity for Cannabis Seedlings

Best Humidity for Cannabis Seedlings

Best Humidity for Cannabis Seedlings

Maintaining the right humidity levels is crucial for the successful growth of cannabis seedlings. In this blog, we’ll explore the best humidity levels for cannabis seedlings and how to ensure they thrive during this delicate stage.

Ideal Humidity Range

Cannabis seedlings are highly sensitive to changes in humidity. To promote healthy growth, maintain a humidity level between 60% and 70% in the seedlings’ immediate environment.

Germination Stage

During the germination stage, when your cannabis seeds have just sprouted, aim for a humidity level of around 70%. This high humidity helps keep the seedlings from drying out as they establish their root systems.

Vegetative Stage

As your seedlings enter the vegetative stage and start developing their first sets of true leaves, gradually reduce humidity to around 60%. This decrease in humidity encourages the seedlings to strengthen their stems and prepare for the flowering phase.

Preventing Mold and Mildew

While maintaining proper humidity is essential, be cautious not to exceed 70% humidity, as excessive moisture can lead to mould and mildew issues. Proper ventilation and air circulation can help prevent these problems.

Using a Humidifier or Dehumidifier

To maintain the ideal humidity range, consider using a humidifier to increase humidity or a dehumidifier to reduce it. These devices can provide precise control over the moisture levels in your seedling area.


In conclusion, ensuring the best humidity for cannabis seedlings is critical for their healthy growth and development. By maintaining humidity levels between 60% and 70%, you can create the ideal environment for your seedlings to thrive while also preventing mould and mildew issues.

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