Would it be a good idea to add ice into my water so that the plants will turn purple. And when should I do this... I am growin afghani and juicy fruit

does that happen in nature?
no...
i think that's a newb question.

you should never do this man!!!! It would either kill or shock the shit out of your plants. purple is not always good its usually a sign of cold weather or nute deficiency. If purple is what you want get a purple strain, but even then out of ten seeds one or two may turn purple. most good genetics are never purple so don't concentrate on getting purple; concentrate on quality and if you by chance get purple then great. just my 2 cents

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The noblest pleasure is the joy of understanding- Leonardo

http://www.rollitup.org/grow-journal...09-set-up.html

there are many threads on the subject... go up to search.. then threads and type in keywords or your question and study...
i learn things everyday

ya man i smoked some purple shit one time and when i say shit i mean shit it was from cold shock and thats all you will be doing by putting ice in your resivor

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if man involved from monkeys and apes why are there still monkeys and apes

Your strain you have going will be great if you don't screw it over with freezing water!! Afghani, it's the landrace of Afghanistan!! Ohh so hot.

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LEGAL"IZE" not CRIMINAL"IZE"

Theres no way one man can do what is for mentioned in my post. Why would I do anything ILLEGAL?

"Cannabis is less addictive than nicotine, alcohol, caffeine, heroine, prescrip drugs, need i go on?"

I am a HIPPIE

dude please don't put ice in res your going for 23C that is perfect temp you will shock your plants don't do this plants don't turn purple from ice. its genetics

ive read of peeps doin this with like white widow to make it look more white. i think i read it in one of the cannabibles?

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http://www.rollitup.org/grow-journal...ml#post2248365

wow and wow...

__________________
The noblest pleasure is the joy of understanding- Leonardo

http://www.rollitup.org/grow-journal...09-set-up.html

Stress to the roots during the night actually stops flower development. so no. The reason cold AIR temps make the bud purple is b/c chlorophyll cant live in cold temperatures but anthocyanin can (the purple pigment). So its genetics and weather not one or the other.