Fact or Fiction?

Is it true that you can turn your buds purple with just temperature control? The info states 70 degrees during the day and 60 at night.

I have been experimenting with this and have noticed a darker purple on a couple of the leaves only, not buds.

ThunderLips said:

Is it true that you can turn your buds purple with just temperature control? The info states 70 degrees during the day and 60 at night.

I have been experimenting with this and have noticed a darker purple on a couple of the leaves only, not buds.

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Yes but only certain strains have the dominant purple pheno. If you plant has the genetics for it then temp drops will cause the color change.

From the info I've found out, and I had a thread on here not long ago about using an AC unit to get more purple since I will be flowering indoors in the middle of summer. the general concensus was that, yes it is indeed possible to use low grow-room temps (at least during the 12 hours off part of the cycle) to get good purple coloring. However, from some independent research I did, I found that the temps needed to cause purple coloration are often different from strain to strain. Some strains will turn purple with no low temps at all, but might turn a darker purple if you were to use lower night-time temps. Also, from what I researched, 60 degrees isnt quite cool enough to cause very much, unless your strain is gonna go purple no matter what. You basically will need to get your growroom to somewhere between 40-50 degrees for a few hours each night. This is usually not an easy task. It can be accomplished, however, if you have the right set-up to really pipe cool air directly into the grow area. I'm thinking of hooking an AC unit up so that It is pumping all its cold air straight into my grow tent, but exhausting the warm air out the window. All I need to do is connect a ventalation tupe with the right sized flange around it, and I could pump AC air through a tube directly into the grow area. It depends on how small your area is, and exactly where it is. Mine is outside the main house, in the loft of the wood-shop. It's a mid sized loft, but it generally reaches ambient outdoor temps at night because there isnt any heating in there except for 2 wood stoves which aren't used this time of year. With an AC unit full blast, I just might be able to make them go pretty purple. Anyway, hope that helped, bro!

I understand exactly what youre saying. Curious though, as I too am using an AC unit. The way AC works is by recirculating the air in a room over and over in order to cool it to low temps, each time the air is circulated through the unit it drops a few degrees.
If you were to port in an AC and exhaust the hot air out, wouldnt you be stopping this process by eventually exhausting your AC cooled air? It wouldnt be able to cycle the cooler air back through the unit in order to get it even colder.
Experiments are fun.

fact.....my growroom gets around 86 lights on and lights off,,,,,it around 70...my tops calyxes turned purple

Today IM seeing the same thing, just like that, but darker purple... Im not sure of the strain this is, I also have some juicy fruit and its not changing at all. the other strain was from a friend and it looks like some skunk or somthing.

The purple that you speak of is true genetics. I know of Indica plants that show hues of purps. Now ihave grown May J's when the temps outside were cooler and there were hints of purple around the calyxes,but i was growing a mixed strain of sativa and indica.You do see in some May J's that the stems may be purple too.

Ya im seeing slight purple on the calyxes but not much at all. Not that purple makes anything better, I was just trying to seperate truth from myth. Im hoping to see if I can get more purple on this.

It all depends on the strain. If you have one that goes partially purple at 70 degrees, it might go more purple at 60, or even almost completely purple at 50 degrees. some strains will stay green until they hit the 50's or below though.

Also, about the AC. By the time the air inside is cool enough to be being exhausted, that means there isnt much hot air left. Also, the way I would have it set up is a little different from what may be thinking. I have a homemade grow-module with air intake and exhaust, This unit is inside another relatively small storage space with a window. Grow module is 6'x4'x6'tall. I would hook the AC unit up basically right to the module, just like it was a window. I will need to cut a wooden frame for it but that is easy. So it will be pumping cold air directly into the grow module, which would then mix with the other air inside from the filtered air input, and then eventually get exhausted out into the rest of the room. That would make the overall tem in the room cooler, but it would be coldest in the grow module. It would even be possible for me to make some kind of flange and attach it to a vent tube to take the hot air out the window. That way there is no cold air being put into the room by the AC unit, and cooler night air would come in and replace it. This is in the loft of a woodshop, so its not very hot there at night since no one sleeps or lives in that building. So any air that was around would either be pretty cool, or cold because it went through an AC unit. Not all AC units recirculate that way. The kind that are mounted in windows vent their hot exhaust outside, and are actually more efficient than the kinds that vent hot air back into the room they are cooling in the first place. However, with the setup I described I don't think that will be necessary to actually vent the hot air, I think it should get plenty cold in there even without venting the hot air away. By the time the air inside is so cold that I can only vent cold air out, then I would consider it a job well done

I have a SSH that was finished in colder teps. It showed purple on the calyxes. A purple haze if you will. Had a C4 x BR that went black in the cold. And a BD that showed purple too. Purpling happens on a regular basis with a lot of different pot plants. Just clean out your fridge and leave a few plants in there for a few days. And see what happens. Peace, Early.

yeah marijuana usually IS purple the green you see is chlorophyl cold brings out the natural colour i was getting black bush buds for a while that were planted late and flowered through winter (sub-tropics)

Remember the purpling is the plants mechanism to cope with lower temps. The reason is purples is the increase the amount of light absorbed, which increases photosynthesis and the internal leaf temperature, more or less regulating it back to a state similar to a grow room maintained at 75 degrees or more. It is true that the purple can be brought out easier if the phenotype allows it, but almost all plants will go purple if brought down to the proper temp.