Watering Calculator
BetaDetermine the optimal watering frequency and volume based on your pot size, substrate, growth phase, and environmental conditions.
BetaThese tools are built from our own experience and deep research. We're actively testing and improving them in real conditions. Got feedback or ideas to make them even better? We'd love to hear from you!
Water when the top 2–3 cm of substrate feels dry. Lift the pot to gauge weight – a light pot means it's time to water. Always water until you see 10–20% runoff to prevent salt buildup.
Watering Interval
3.0d
Water per Pot
2.8L
Daily Need
0.92L
Target Dry-Back
50-60%
Waterings/Week
2.3x
Weekly Total
6.4L
How to Water Cannabis Plants Correctly
Overwatering is the number one mistake made by beginner growers. Cannabis plants prefer a wet-dry cycle where the substrate partially dries out between waterings. This cycle encourages root growth and prevents root rot.
The ideal watering frequency depends on several factors: pot size, substrate type, plant size, temperature, and humidity. Smaller pots dry out faster, coco dries faster than soil, and higher temperatures increase evaporation.
A good rule of thumb is to water with 20–30% of the pot's volume. For an 11-liter pot in soil, that means about 2.5–3 liters per watering. In coco, increase to 30% to ensure adequate runoff for preventing salt buildup.
Monitor the dry-back percentage – how much moisture the substrate loses between waterings. Soil should dry back 50–60% before the next watering, while coco only needs 30–40% dry-back. Under-watering causes nutrient lockout; over-watering causes root rot.
Frequently Asked Questions About Watering Cannabis
Healthy Roots Start with Great Genetics
Give your watering routine the best foundation with our premium, well-rooted clones.
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