The present relates to a steam concentration conduit, a steam concentration nozzle and weed killing apparatus for expanding and directing a flow of steam from a steam apparatus, into a concentrated flow of steam. The steam concentration conduit comprises a body having a first end and a second end. The first end is adapted for receiving the flow of steam from the steam apparatus. The body defines between the first end and the second end, a conduit for expanding and directing the flow of steam received at the first end into a concentrated flow of steam.
