David,

Un-pot your plant.

Scrape the bare neck (gently!) of the callus so the green tissue is exposed.

Use fresh soil (Agitate? Not sure what that means. But no.)

Re-pot covering the neck. The exposed tissue will grow roots.

If the plant is too large to sink into the proper size pot, slice the appropriate amount off of the bottom of the root-ball, then plant.

Water and place back in the growing area.

Linda

If there is old, caked soil around the top, you do removed that. Perhaps that is the "agitate the soil?" Sometimes we have soil on top, especially that has gathered fertilizer salts and become more of a "crust."

Diana