Leaf color in Phals can be partly due to environment, partly due to heredity.
Typically my Phals seem happiest when the leaves are a Kelly green or a bit darker, to possibly as dark as a forest green. Darker, between forest green and British racing green, they don't flower, or don't flower well. It is not unusual to have leaves that also have a bit of red in them under good light; for the species and hybrids that can have red pigment in the leaves, a bit of red is a good thing (but can darken the leaves).
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