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Help calculating how much potting mix will I need, please

11 years ago

I purchased some 10 and 20 gallon "smart" type pots to try. I have no idea how much potting soil I need to have for each one. The best price locally seems to be Costco's 55 quart bag for 9.99 and I would like to stock pile enough before they run out for the season. Now I know standard measure equals 4 qts per gallon, but I am not sure if the pots and soil are both dry or liquid measurements. Is it as simple as 80 quarts of soil for each 20 gallon pot? (oh boy, that's a lot of soil!) Are they using the same unit of measure?

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