Rhizopon is a primary manufacturer of plant rooting products. Most of the site is written in the Dutch language. They have some nice information on auxins.
Phytotronics, Inc Phytotronics have a large selection of propagation equipment and supplies for the commercial greenhouse and nursery. They are the master distributor of mist controllers, lighting and all the plant rooting hormones listed on this web site.
ARIS (formerly Yoder) Green Leaf Plants
and Keepsake Plants
are the world's leading growers of all types of
perennial plants. They use and recommend to their customers our Hortus IBA Water Soluble Salts.