i don't think its a sign of defiency, your plants look decently healthy. Because theyr'e outdoors, even though its not getting cold yet, temps are starting to drop considerably at night. These are just at the growth tips as well, no where else on the plant. You'll also notice that the leaves lose this purple coloring as they growth outwards from each node....they start purple and turn green. I've seen it happen many times with indoor and outdoor plants, and it always comes with the fall/winter temperature dip.

Some plants are very finicky when it comes to temperature and humidity. Depending on your genetics, your probably growing a strain originating from SE Asia or the middle east. A 10 degree drop in temperature is a huge deal to a plant that's might be genetically programed to flourish in hot weather. These pain in the ass strains always seem to be the dank though..........
drudown11 Reviewed by drudown11 on . Not Purple Bud, Nore is it cold!! Why Purple, Fungus, Early Sign Of Bud Rot? How you doing folks, im in some need of some real help, my outside girls "all sexed" are all just now starting to flower, pre flowers on some.. 2 to 3 weeks ago i notice on one plant inbetween shoots there was a purple like color forming, in quite a bit of shoots all that plant as a mater of fact.. over the next couple days i started to check the rest of the plants top to bottum and notice that its on them as well, not all are as bad as the first but i can see more and more everyday.. I know Rating: 5