Purple Leaves in Flower

Hey guys I heard when the temp drops the leaves turn purple and that's how you can get some color to your buds do these pics look like a result of temp or amitriptyline doing something wrong? Btw yes this is my 1st grow. AK-47 Auto from Growers Choice

Temp drops reduce absorption of phosphorus. Not really a good thing.

hmmm, im less concerned with the purple as i am with the yellow......

there is no coming back at this point... so... as you were.

Autumn leaves falling in the background , winter is here, (while in the southern hemisphere we swelter in heat)

The amount of temp swing is important.
Lower temps slow down growth... The lower the temps the roots get to, the worse that becomes.

I run my bloom area at a strict 72.5 to 74.5 at lights on. (this is done by using greenhouse thermo switch's for cooling)
Lights out? The heater comes on at 60 deg. That 12 to 14 deg swing is about the limit....

@RangiSTaxi Has a real point though.

Once those leaves turn yellow. They do not do much (if any) photosynthesis any more. Your loosing growth factor.
Too much P can do that, fast.

Not "Boosting" helps. So does not starting any "bloom" food till week 3 of bloom. Continue using the Veg or Grow for the first 2 weeks of bloom.

Once yellow, you can not get the leaf green again.

RangiSTaxi said:

hmmm, im less concerned with the purple as i am with the yellow......

there is no coming back at this point... so... as you were.

Autumn leaves falling in the background , winter is here, (while in the southern hemisphere we swelter in heat)

Click to expand...

So is she gone make it to harvest time or should I just trash now

keep em going just feed properly and try and keep temps up lights out!!