Play Bloom defender on Kizi! Grow unique defensive trees along the paths leading to the Mother Tree to protect it from elemental spirits. Be strategic and cast. Bloom is a computer graphics effect used in video games, demos, and high dynamic range rendering (HDRR) to reproduce an Theory · Practical implementation · Use in games · See also. Bloom Defender at Cool Math Games: Defend Mother Tree from hundreds of evil spirits! Build an army of plants to stop them in their tracks.