Tall square garden planters are commonly made from plastics (including polypropylene), woven or plastic rattan/poly‑wicker, metal (often galvanized steel), and cement.
Heights vary by model, but tall square planters commonly range from about 18 inches up to roughly 30 inches.
At least one tall planter model includes an integrated reservoir and a water‑level monitor that enables automatic watering when moisture levels fall.
