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Large pot volume
Cass wrote in message . ..
Shepherd wrote: Just bought several large pots to plant my bare-root roses in. The tag states that the pot's soil volume is 0 quarts. The pot measures about 19" X 19". Can anyone please tell me what the volume of dirt I will need to buy for these pots? So mathematically, I vote with Sameer, only because I did the numbers the same way. Let's see: you need to put some rocks or broken pots in the bottom for drainage and to cover the drain holes; you don't fill all the way to the top; the bareroot takes up some of the volume of pot; potting soil, while a tiny bit damp (if you're lucky), will reduce in volume several inches once you water it. My gut, however, tells me that a 2 cu ft. bag of soil would be almost adequate once you add bone meal, a little alfalfa, and the rose. Besides, no garden project would be complete without two, if not three, visits to the nursery. ;~) Here is a little formula that works for me. Measure the diameter of both the top and the bottom; let's say they are D1 and D2 (in inches). Then, r1, r2 are radii (again in inches). Measure the height of the pot, let's say it's x inches. Define, h1 = x * r1 / (r1 - r2) h2 = x * r2 / (r1 - r2) Then, the volume of the pot in cubic inches is (volume of a cone): (1/3) * pi * (r1 * r1 * h1 - r2 * r2 * h2) Divide this by 1728 to get the volume in cubic feet (by about 230.67 to get it in gallons). This over-estimates a bit if the pots are curved inwards, and, as Cass said, you'd need to fill less in any case. I agree with Bob, 19-21" ones aren't big enough. I am moving over my favorite ones to 24" pots. Bob, any idea where I can buy 30" pots? Thanks, Debu. |
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