A stabilizer which has general purpose use but which is particularly well suited for use with temporary real estate signs has an elongated body adapted for pivotal connection with a post for vertical swinging movement. A plurality of flanges or wings are spaced apart longitudinally at an opposite and free end of the body and define flat laterally extending anchoring surfaces. The free end of the stabilizer body is inserted into the soil on forceful downward swinging movement of the body and the lateral anchoring surfaces firmly secure the post against angular movement toward and away from the stabilizer. The stabilizer can be releasably stored in an upright position adjacent the post.
