The invention provides a plant growth system comprising growing substrates (110； 206； 306) as well as plants (P) of which the roots (R) grow in the growing substrate, a number of holding bodies (100； 202； 301) each having a bottom (101； 224； 324) and at least one bottom spacer (104, 105； 9b； 309b), the at least one bottom spacer at the upper side thereof supporting a growing substrate thereon such that a distance is maintained between the bottom and the growing substrate, - irrigation means (331) for supplying water to the roots of the plants, - drainage means having a drainage opening (241； 341) in the bottom as well as a common drainage which is in communication with each of the drainage openings for allowing water supplied by the irrigation means to the plants to drain via the drainage opening to the common drainage, - a water permeable root barrier (123； 205； 305) for each holding body wherein the at least one root barrier is positioned below the upper side of the at least one bottom spacer, upstream of the common drainage for allowing passing of water throught the root barrier to the common drainage but preventing the roots from penetrating throught the root barrier in the common drainage.L'invention concerne un système de croissance de plante comprenant - des substrats de croissance (110 ； 206 ； 306) ainsi que des plantes (P) dont les racines (R) se développent dans le substrat de croissance, - un certain nombre de corps de maintien (100 ； 202 ； 301) ayant chacun un fond (101 ； 224 ； 324) et au moins un élément d'espacement inférieur (104, 105 ； 9b ； 309b), le ou les éléments d'espacement inférieurs soutenant, sur leur côté supérieur, un substrat de croissance de telle sorte qu'une distance est maintenue entre le fond et le substrat de croissance, - un moyen d'irrigation (331) pour alimenter de l'eau aux racines des plantes, - des moyens de drainage ayant une ouverture de drainage (241 ； 341) dans le fond ainsi qu'un drainage commun qui est en communication av
