Also called "fibre optic grass". Cloud grass is an upright, annual grass with slender, upright, linear, bright green leaves and airy panicles of tiny, purple-flushed, cream flowers in summer. 

Annual
Height 15-35 cm
Width  30-35 cm
Spacing 20-30 cm
Flowering time VII-X
Site sunny or slightly shaded, good garden soil 
Propagation seeds