Historically, and still to a significant extent today, they are made from plain terracotta with no ceramic glaze, with a round shape, tapering inwards.
An example of biodegradable pots are ones made of heavy brown paper, cardboard, or peat moss in which young plants for transplanting are grown.
Also Orchids, African violets and Pelargonium geraniums were shipped in pots from other parts of the world, including Africa, to North America and Europe.
[2] In the 18th century, Josiah Wedgwood's flowerpots or cachepots, were very popular; they were often highly decorative and used as table centrepieces.
Theophrastus, c. 371 – c. 287 BC, mentions that a plant called southern-wood was raised and propagated in pots because it was difficult to grow.
The traditional sizes[5] were as follows, although others existed: Other sources give different values, and sometimes names, for the smaller pots, for example The Gardener's Everyday Log Book while agreeing on "twos" to "thirty-twos" has two different types of "sixties" and disagrees on "thumbs" and "thimbles":[6] A taller and thinner shape of pot, suitable for deep-rooting plants, was known as a long tom, a term still used.
Some organisations (such as the Royal Horticultural Society) encourage the reuse of (plastic) plant pots and trays across their retail centres.
[15] Plastic pots come in a number of standard sizes, with a code indicating the approximate dimensions of the diameter at the top.
[16] This will in part be due to a higher availability of nutrients and water in larger pots, but also because roots will get less pot-bound.