Lobelia Cardinalis Mini. This dwarf Lobelia species is a stem plant that grows bright green, oval-shaped leaves with pale green coloured veins. It is perfect for creating small, lush bushes, or can be used as a low maintenance foreground carpet in larger aquariums. Lobelia cardinalis Mini is easy to grow, primarily requiring bright lighting and regular fertilisation. The addition of injected CO2 will see this plant reach its optimal form.