phytohormone
plant hormone
growth regulator

Honey, though it does not contain any plant hormones, can also make an effective rooting substance.

Tropisms generally result from an interaction between the environment and production of one or more plant hormones.

Like the other plant hormones, ethene is considered to have pleiotropic effects.

Without the use of plant hormones, the seeds have a 24% sprouting success rate.

Some of these act by interfering with the growth of the weed and are often based on plant hormones.

They were the first of the major plant hormones to be discovered.

He isolated and determined the structure of auxin, the first known plant hormone.

It was the first plant hormone proven to be a peptide.

Traumatin is a plant hormone produced in response to wound.

It is a member of the jasmonate class of plant hormones.