A plant support frame for supporting plants, comprising a rod attachment for supporting flat holding elements adapted for receiving a vertically adjustable rod, said rod attachment comprising a substantially H-shaped attachment member having a first slot, a first recess and a first connecting web formed between the first slot and the first recess, wherein the first recess is laterally defined by two first substantially parallel limbs, wherein the first limbs are connected to each other by means of the first connecting web, and wherein the first slot and the first recess extend from the first connecting web in opposite directions； and a substantially U-shaped attachment member having a second recess and a second slot extending therefrom, wherein the second recess is laterally defined by two second substantially parallel limbs； wherein the H-shaped attachment member and the U-shaped attachment member are flat in shape； and wherein the H-shaped attachment member is adapted for attachment to a first end of the rod, and wherein the U-shaped attachment member is attached to the H-shaped attachment member in a crosswise manner relative to the H-shaped attachment member so that the first slot engages the second slot, wherein the two first limbs and the two second limbs form a first enclosure so that the rod can be firmly locked at its periphery in this first enclosure by the first and second limbs.
