The present invention, in different embodiments, discloses a horticultural tray and a method of use thereof. The horticultural tray includes first and second elongate portions having one or more receptacles for growing medium, and a foldable elongate portion between the first and second elongate portions. The foldable elongate portion has a central hinge and sloped side portions that slope downward and away from the central hinge toward the first and second elongate portions. The foldable elongate portion also has side hinges disposed between the foldable elongate portion and the first and second elongate portions. The horticultural tray may also have a first locking tab and a second locking tab configured so that the first locking tab fits securely inside the second locking tab when the horticultural tray is in a collapsed configuration.