Mixing

Seedling with roots growing in a glass jar of water

How to Measure Small Nutrient Doses for Mason Jars

Short answer: divide the label's per-gallon rate by four for a quart jar and by eight for a pint jar. For accuracy, it is easier to mix a full gallon and fill several jars from it. Jar sizes as fractions of a gallon JarVolumeFraction of a US gallon Half gallonabout...