The purpling is a normal response to the low o/nite temps.

Large swings between day and night temps can cause the new growth to look light green (cold bleaching).

If you have warmed things up you shouldn't have anything to worry about.
sarah louise Reviewed by sarah louise on . My leaves are turning purple!?! These pictures were taken a week ago. They've been flowering for 6 weeks. They are "Pot Of Gold". This week the larger, older leaves started to turn purple. The trics haven't started to turn amber yet. Should I start to flush now? Rating: 5