Purple bud?

looks that way. some strains do this. you might also notice red or purple striping on your stem. cooler temps can cause this as well.

 

There used to be type of weed called Jamaican Purple, but I never had it.   Purple Haze is a recent strain, never had that either.   I had plenty of weed with red in it though, that's usually a very good indication of quality.  

 

they say purple bud tasts the best. imo they are right.

 

 
Agreed.  You see this a lot with outdoor grows.   Especially with strains that are indica dominant. 

 

A purple striping or coloring of the stems is usually a magnesium deficiency
. 
purple in the bud and ON the leaf indicate a drastic temp change at night, that's ok. Chlorophyl is not the only photosynthetic pigment at work in plants. there are also carotenoids, and Anthocyanin's.  When the Chlorophyl dies off, due to drastic temp differences, some of the Anthocyanin's are left and develop a purple or red color on the leaves.
 
 
The interesting thing about Anthocyanin's is that they are also pH indicators, so I wonder if you can change the purple into a vibrant pink or yellow, which is what colors it also shows in different conditions, if you change the pH right at the end in a plant that is all ready showing purple.

 

Purple stripes can also be a genetic trait, solid purple areas is a deficiency that you mentioned. Temps of 65 degrees or colder can bring the purple color out if it has purple genetics. There are also some plants that will get a pink or blue color to them in 65 degree or cooler temps as well and is genetic also. I wouldn't worry to much about night time temps unless they drop down to like 50 degrees or less.

 

I personally just got rid of purple striping on all five of my plants by adding epsom salt because I was using distilled water. The purple stripes, are now green again.
 
I suppose my pH could have been a bit out locking stuff out, but either way, if it was genetic, I wouldn't have had them on every single plant, and I wouldn't have been able to correct it.
 
I was also getting other symptoms of Mg def though, thats how I knew. 
 
I have found very few topics relating to this, most just seem to write it off as genetics, but I beg to differ.
 
 
Here is the video that actually pointed me in this direction. http://youtu.be/BOwpB3J8lis

 

Yeah there isn't much info regarding the purple striping and theres some debate on it. I had an Island Sweet Skunk that has purple genetics in it and it didn't matter how much magnesium or calcium I gave it the purple striping stayed.

 

it could have been lock out for some reason, showing you mag def.

 

Interesting specimens of what we are both talking about. 
 
Thanks for sharing.
 
Hope you can find more insight or at least this was useful to you.
 
@[member="tplat"] go check out his pictures real fast and then tell me what you think.

 

yea that def looks like a male plant...looks like a bunch of balls

 

Male....