Abstract: Invention relates to a lawn aeration device for attachment to the wheel of a riding mower, for example. The device, where a plurality are spaced about each driven wheel, comprises an arcuate-shaped metal plate, contoured to lie against the riding surface of the wheel's tire, where the metal plate includes plural aerating spikes extending in a generally outwardly radial direction. Adjustment means are also provided along the respective sides of the wheel to connect and apply tension to the plural devices.