Abstract: A stabilizer (10) for an in-ground member (12) includes: a mounting collar (16) having a channel (18) extending therethrough; a plurality of arms (20a-20d) having respective collar ends (30a-30d), the collar ends being adapted to extend through the channel and engage with the mounting collar; and a resilient member (40) being sized (a) to be disposed within the channel between the collar ends and (b) to be engaged by the in-ground member so as to urge the resilient member against the collar ends to force the collar ends against the mounting collar, whereby to rigidify the stabilizer. A method is disclosed for installing the above-described in-ground member into the ground to dispose a portion of it beneath the surface of the ground and to leave a portion of it extending above the surface of the ground.