An object of the present invention is to provide a plant support material for steam cultivation suitable as a flower arrangement and cutting, as a planting material, as a means of transporting florets and fresh vegetables, inexpensive, easy to handle and excellent in the bottom irrigation function. SOLUTION: A planting material layer 13 comprising a tufted pile fabric 12 is laminated on an upper side of a steam drifting layer 11 and surrounded by a packaging material 14 to constitute a plant support material for steam cultivation. The steam drift layer is composed of a synthetic fiber web having a single fiber fineness of 1 to 30 dtex and a heat-fusible low-melting-point polymer, and has a bulk specific gravity of 0.01 g / cm3 to 0.07 g / cm3 and a porosity of 93% to 99%. Is used. For the planting material layer, a tufted pile fabric having a bulk specific gravity of 0.08 g / cm 3 to 0.14 g / cm 3, which is a hygroscopic synthetic fiber, is used, and the tufted pile fabric 12 is loaded into the packaging material 14 to obtain a porosity. The planting material layer is 85% to 96%. The plant 21 appears on the surface of the planting material layer and is supported by being inserted into the joint 19 between the tufted pile fabrics adjacent to each other. [Selection] Figure 1【課題】植栽資材としても花卉や生鮮野菜類の輸送手段としても、安価で取り扱い易く底面潅水機能の点でも優れ、生け花、挿木に好適な水蒸気栽培用植物支持材を提供する。【解決手段】水蒸気漂流層１１の上側にタフテッドパイル布帛１２に成る植栽資材層１３を積層し、包装資材１４で包囲して水蒸気栽培用植物支持材を構成する。水蒸気漂流層には単繊維繊度が１～３０ｄｔｅｘの合成繊維ウェブと熱融着性低融点ポリマーに成り、嵩比重０．０１ｇ／ｃｍ3 ～０．０７ｇ／ｃｍ3 、空隙率９３％～９９％の不織布を使用する。植栽資材層には吸湿性合成繊維に成る嵩比重０．０８ｇ／ｃｍ3 ～０．１４ｇ／ｃｍ3 のタフテッドパイル布帛を使用し、そのタフテッドパイル布帛１２を包装資材１４に装填して空隙率８５％～９６％の植栽資材層とする。植物２１は、植栽資材層の表面に現れて隣り合うタフテッドパイル布帛間の継ぎ目１９に差し込んで支持する。【選択図】図１
