The company claims that Jiangxi Kangfei Plastics copied the design of its TEKU pots and adopted the same item numbers.
Poppelmann discovered the products on display at HortiFair in Amsterdam last month. A bailiff confiscated the pots from the Chinese manufacturer's stand.
Poppelmann head of marketing and sales Matthias Lesch said: "We have sent out a clear signal that we are keeping our eyes open and know how to defend ourselves. We will vigorously pursue all legal avenues in future to prevent the distribution of any such copies."
The company said competitors had tried to copy products in the past and it will continue to focus on getting patent protection for its products.