Forum Karczmy Bezdennego Kufla

cheapbag214s

Why are pots typically wider at the top than at the bottom,[link widoczny dla zalogowanych]
Recently I needed a pot with shape that would make it as stable as possible so that it's unlikely to tip over and fall from the shelve. Seedlings in soft trays are another story,[link widoczny dla zalogowanych], you can squeeze the sides and bottom to get it out. Also, stability is more a function of width vs height (low center of gravity is better) than shape. If you stick a 6 high plant in a pot with a 6" diameter base,[link widoczny dla zalogowanych], it will tip over regardless of shape; but a 1 high plant in a pot with a 1 diameter base will not tip over unless you have a very determined cat. bstpierre Oct 28 '11 at 13:27
With ceramic pots,[link widoczny dla zalogowanych], I imagine it's easier to get sloped sides cleanly out of the mold when manufacturing. This may be true of some plastic manufacturing,[link widoczny dla zalogowanych], too.
When transplanting,[link widoczny dla zalogowanych], it's easier to get the plant out,[link widoczny dla zalogowanych], complete with all the soil,[link widoczny dla zalogowanych], if the sides are sloped. For seedlings,[link widoczny dla zalogowanych], the reduction in root hair damage may also be significant. Once it's free from the bottom,[link widoczny dla zalogowanych], there's no contact with the sides,[link widoczny dla zalogowanych], if you pull out straight. With a cylinder,[link widoczny dla zalogowanych], the soil is scraping against the sides all the way up. If the sides are really slippery, like most plastics,[link widoczny dla zalogowanych], this doesn't matter too much.
This makes the most difference when transplanting seedlings,[link widoczny dla zalogowanych], and plants where the pot is still larger than the plant needs. For seedlings, the reduction in root hair damage may also be significant. At the other extreme,[link widoczny dla zalogowanych], larger root-bound plants will usually hold the soil together regardless of pot shape.
As for styrofoam seedling trays which are often cylindrical - the shape is certainly a problem for me. The higher friction of them makes getting seedling out of them cleanly a lot harder than with other materials. The shape compounds the problem. Tried them,[link widoczny dla zalogowanych], didn't like them. They're probably fine for growers for whom the seedlings are always root-bound before transplanting.
The compression tries to press the vessel into a sphere,[link widoczny dla zalogowanych]. If you try to create a cylinder with ceramics the firing compression will squeeze most strongly right in the middle causing it to break,[link widoczny dla zalogowanych]. That's why it's so hard to make ceramic pipe and most historical ceramic pipes where not true cylinders,[link widoczny dla zalogowanych].
Creating a conical shape creates some usable cylindrical space while directing the compression force in a strong circular vector that works something like an arch,[link widoczny dla zalogowanych].
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