Most of the West German pottery companies produced ranges of plant pots as well as vases. Plant pots were produced in huge numbers, at one time the majority of houses in Germany and countries like the UK would have had them on their windowsills. Today however it is increasingly difficult to find them without damage; this is probably attributable to their usage as common household objects over the years. As a result, they would not be valued highly by their owners, treated roughly and often left outside exposed to the elements.
The variety of designs and glazes available combined with their practicality means that they are once again becoming increasingly popular and are often a first gateway to the wider area of West German pottery for many people.
It is easier to list companies that did not produce plant pots (Otto, Ruscha and Steuler) than those that did (Bay, Carstens, Dumler & Breiden, ES, Fohr, Jopeko, Kreutz, Roth, Scheurich, U Keramik, Van Daalen and Silberdistel) (based on items that I have with base markings or original labels). Scheurich continues to manufacture plant pots which can be found for sale in garden centres and homeware stores.