An aeroponic propagator (1) for the cultivation of plants comprises two end frames (11), a first support member (12) extended between the two end frames (11) and a substantially opaque sheet (13) for supporting plants to be cultivated, wherein the opaque sheet is suspended from the first support member to form at least one side wall of a chamber (14) between the two frames (11) for roots of plants supported on the opaque sheet (13).