Abstract: A hothouse has at least two elongate cultivation corridors beside each other for a series of cultivation wagons which are transversely shiftable along the cultivation corridors in order, during the cultivation cycle, to be progressively moved around in the hothouse. A plant treatment area is provided outside the extent of the cultivation corridors for the starting, care and harvesting of the plants cultivated on the cultivation wagons. Transfer wagons are provided for transfer of the cultivation wagons between the elongate cultivation corridors and also for removal of optional cultivation wagons to the plant treatment area, the transfer wagons having a corridor section for receiving the cultivation wagons during their transfer from one cultivation corridor to the other and during their transfer to and from one cultivation corridor and the plant treatment area. The transfer wagons are reciprocal along transfer corridors which extend transversely of the cultivation corridors.