A plant incubator apparatus and method of growing plants includes a sloped lower plant housing. The lower plant housing has multiple lower depressions and a lower locking periphery. An upper plant housing is coplanar to the lower plant housing, and has multiple upper depressions that receive a plant growing medium. The depressions are in communication to enable flow of liquid and air. An upper locking periphery detachably mates with the lower locking periphery to form a slot for air circulation. A light guard fits over the upper plant housing to block light from striking a plant from at least one direction. A valve assembly is at the drainage end of the lower plant housing. The valve assembly is in communication with the upper depressions of the upper plant housing to indicate liquid levels and drain excess liquid. A liquid regulation device having a timer automatically controls drainage of liquid.