The invention at least includes an inner pot body, an outer pot body, an adjustment element having a position limiting part, and a drainage water-permeating element. The inner pot body is located in the outer pot body, in which a space region is clampingly formed between an outer rim of the inner pot body and an inner rim of the outer pot body, and a concaved containing region that is surroundingly formed by a bottom surface and a side surface of the inner rim of the inner pot body includes a bottom surface formed with a guide part. The guide part of the inner pot body includes a water permeating hole formed inside thereof and a combination part formed thereon, in which the position limiting part of the adjustment element is allowed to be assembled on the combination part. In addition, the adjustment element includes an inner side penetratingly formed with a channel that is communicated with the water permeating hole of the guide part. The drainage water-permeating element, which is located at the water permeating hole of the inner pot body and the channel of the adjustment element, is formed by a plurality of mutually-assembled particles, and the adjacent particles therebetween can be provided with micro conducting channels that are mutually communicated.本發明至少包括有:內盆體,係位於外盆體的內,且使內盆體外緣與外盆體內緣之間夾置形成有一空間區,並使內盆體的內緣底面及側面所環繞圍成一凹陷狀容置區域,而容置區域的底面形成有導引部,且導引部的內側形成有一滲水孔及其上設有結合部,以致使調整件之限位部能組設於結合部上;又,調整件的內側形成有一貫穿的通道,且使上述通道能與滲水孔呈連通;另,引流滲水件,其係由複數個粒子相互組合而成的,且使相鄰粒子間會形成相互連通的微引道,並使引流滲水件位於內盆體之滲水孔及調整件之通道上。10...底面101...導引部102...滲水孔103...結合部13...容置區域15...空間區18...油封2...外盆體4...調整件40...通道43...限位部45...扳動部5...引流滲水件50...粒子50’...粒子51...微引道90...植物95...土壤A...距離B...距離
