push downwardly in the slot without becoming dislodged a number of web elements 64 which are integrally formed in the plastics moulding process extend between adjacent ribs to lend torsional rigidity to the supporting portion the wire attachment means formed in the lower parts of the supporting portion are in the form of a curved slot 63 which may have a generally c or spiral shaped configuration the different configuration for the slot in lower most portion is preferred because it is anticipated that wires threaded through the lower curved slots 63 will be fixed permanently in place the particular shape of curved slot is more readily adapted to hold wires permanently than the t slots by comparison the shape of the t slots 62 allows the wires to be readily removed and placed into slots at different levels as the branches of the vine grow and the vine is trained to grow up to the full height of the post as for the peg 55 it can be seen that this also includes four ribs 67 which are themselves reinforced by a number of webs 71 extending between adjacent ribs the peg narrows in diameter towards its pointed end 75 it is provided with barbs.