A trayless flowerpot with water conservation and insect control arrangement, which includes a main body and a water conservation arrangement. The water conservation arrangement includes a plurality of ventilating holes formed on a lower portion of the main body, at least one through drainage hole formed on the main body, a control valve provided on the drainage hole, and a plurality of selective passage members attached on an inner surface of the main body to completely cover the ventilating holes respectively. Each of the selective passage members is configured to have a predetermined water permeability and a predetermined air permeability. When a predetermined amount of soil and water are disposed in the receiving cavity, the water is substantially conserved in the received cavity for being absorbed by the plant.一種具有節水防蟲裝置的無托花盆，包括主盆體和節水防蟲裝置。主盆體具有底壁、從底壁向上延伸的側壁、由底壁和側壁圍繞而成的空間所構成的收容腔，以及一連通收容腔至主盆體外部的頂部開口。節水防蟲裝置包括多個通風孔設置在主盆體的下部，至少一個排水通孔設置在主盆體上，一控制件設置在排水通孔以使能夠選擇式開啟並把水由收容腔排出；以及多個選擇性通道構件設置在主盆體以完全對應和覆蓋通風孔，選擇性通道構件具有預定的透水性能和預定的透氣性能。當預定量的土壤和水設置在收容腔時，水會被保存在收容腔中，以便被植物吸收。
