purple stems may be nothing to worry about and if u are growing a purple strain and plants are healthy then no drama. However in older plants its a sure sign of mg or phos def as the author said. either of them will result in way under par bud.
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I maybe going threw this right now with my transplanted clones. I will know in about a weak.
ur not mate, well actually u are. but thats just because ur clones are feeding off themselves while they root. im sure u'll find once u add nutes they'll be absolutely fine.
how long they been rooting and transplanted?