leaves going purple?

got a couple of plants near harvest outside and i have noticed that the odd leaf is turning purple. i dont think they are growing purple as the bit of leaf inside the bud is still green. any ideas?

Outdoor temps mate

Yeah. Its just 'cause it is getting colder smarty and nothing to worry about. Mine are going purplish also.
I THINK IT LOOKS COOL.

nongreenthumb said:

Outdoor temps mate

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temps. ive had the hole top half of my orange crush go purple

that must be it then, its been freezing here for a while on and off.

thanks guys