A height-adjustable plant support structure is a device used for providing structural support for a growing plant. The device includes a primary stabilizing tubular member and a plurality of primary extendable tubular members that is able to telescopically extend from and retract into the primary stabilizing tubular member. A plurality of accessory-mounting holes laterally traverses into the plurality of primary extendable tubular members and may accommodate hooks, ties, strings, and other accessories for supporting the growth of a plant. A flexible water-distribution conduit is positioned within the plurality of primary extendable tubular members, allowing water to be delivered directly to a plant's roots. The device height may be adjusted manually or automatically via a pneumatic telescopic cylinder. At least one flexible trellis member is utilized to support growing plants such as shrubs, grapevine, ivy, and climbing roses.
