Ungemach Pottery Co., or better known as UPCO USA, was established in 1937 and first went by the name South Fork Pottery. The founder, Fred Ungemach built the company in Roseville, Ohio. He mostly created garden, decorative, and floral pieces in styles of Art Deco and early Mid Century Modern.
To purchase the #105-7 Cactus Planter by Ungemach Pottery Co., visit Found.
Other examples of UPCO work:
Image from Vintage Art Pottery
Image from Pinterest
Vintage Art Pottery. Accessed from https://vintageartpottery.wordpress.com/2013/08/13/upco-ungemach-pottery/