Red Leaves on Rlc. Little Toshie "Pizzaz"

[Nexogen]

1. Anthocyanin pigments are responsible for the red, purple... colors, protecting cells from high-light damage by absorbing blue-green and ultraviolet light, thereby protecting the tissues from photo inhibition or high-light stress.

2. Your plant need food, but; Phosphorus deficiency symptoms include reduced growth and yield, delayed maturity, and generally red or purple coloring along the edge of the plant leaves.

http://ag.arizona.edu/pubs/garden/az1106.pdf

3. A pseudo deficiency created by disease or genetic abnormalities.

4. Pesticide, etc.

IMO