Abstract: An improved compost bin is disclosed and a ventilation channel is formed directly beneath the compost contained in the bin. A tunnel member having a perforated upper portion is contained in the channel to maintain a free passage for air to the base of the heap. The tunnel also prevents the walls of the channel from collapsing and the passage thereby becoming blocked either by the substrate on which the bin is mounted on by decomposing vegetable matter from the bin.In preferred embodiments, end caps are provided to further inhibit the encroachment of the substrate around the walls of and into the tunnel. Holes are provided in a central portion of each end caps to ensure free passage of air.The bin comprises a plurality of similar panels which interengage to form a plurality of vertical sliding joints. The dimensions of the panels and the tunnel are preferably such that, when not in use, the panels may be confined within the tunnel. The bin is normally sold in a kit taking this form.

Abstract: The invention relates to compost bins in completed or in kit form. A plurality of similar panels are interconnected to form a wall in which one or more panels may be raised to afford access to the interior of the bin. The sides of each panel comprise complementary forked cross-sections which engage to provide a draught resistant seal. Preferred embodiments provide a space between the crotches of the forked cross-sections for the insertion of a securing stud.