Be cautious: too much auxin can inhibit rather than enhance root formation.

It is added to help induce root formation in various plant types.

Researchers have determined that root formation continues well into November, or even early December, if mild weather holds.

If the ground is heavy clay, some sand or compost should be worked into the rows before planting to assure good root formation.

This tissue has no influence on root formation.

Then the discovery was made: corn gluten meal has the ability to stop root formation.

The meal stopped root formation at the time of germination, but after germination, it had no effect.

Later, with growth of the shoot (particularly when it merges into the light) there is increased secondary root formation and branching.

Lightly tug on the cactus to check for root formation.

Some evidence suggests that phosphorous acid may inhibit proteoid root formation.