What EC should I use for cannabis seedlings?
Count your starting water in the total EC. Adjust to how your seedlings respond.
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Why
Start around 0.5 EC for seedlings, with about 0.4 to 0.6 EC as a starting range. Seedlings and nutrient mixes vary, so watch plant response rather than treating one number as a fixed requirement. That is total EC, including your starting water. Reverse-osmosis water may contribute almost nothing, while tap water can use up part of the target before nutrients are added. Begin mild, balanced nutrition as the cotyledons open and the first true leaves develop. Too much EC can create osmotic stress, tip burn, wilting, or stalled growth. Compare readings at the same water level after circulation so the trend actually means something.
What to remember
- Start around 0.5 EC for seedlings.
- Use roughly 0.4 to 0.6 EC as a starting range and watch plant response.
- Count the EC of your source water in the total.
- Begin mild balanced nutrition as cotyledons open and true leaves develop.
- Compare reservoir trends at the same water level after circulation.
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