A plant tray for receiving and retaining one or more plant pots includes a plant-receiving tray for use in a high-throughput plant infiltration process used to produce recombinant proteins. The plant tray described has a base retaining tray with an upper surface defining cavities for receiving the plant pots, and a top plate displaceably mounted on the base retaining tray and having apertures, the apertures defining a channel with the corresponding cavities of the bottom tray when aligned. The top plate is displaceable between a locked operative position wherein the apertures and the corresponding cavities are partially misaligned, thereby locking the plant pots in between the top plate and the base retaining tray.