An apparatus for processing horticultural products, pushed along a tank of a respective processing line by a fluid current, on which the horticultural products can float freely. The apparatus includes at least one floating alignment matrix, provided with a base platform, which in turn can be submerged at a predefined section of the tank, and with a plurality of mutually parallel partitions extended at right angles from the upper face of the platform and, when the platform is submerged in the predefined section, at least rise above the free surface of the predefined section. Each pair of adjacent partitions can be arranged along the movement direction of the fluid current, thus defines a respective channel for automatic forced alignment for the horticultural products, pushed toward the predefined section by the fluid current.