Purple stems on clones...

[nickman]

Can lack of cal-mag cause this??? Ever since I upped the cal mag it seems to be helping ...

Just curious...!!!...

 

[RB56]

Always been temps too low on the strains I grow.

 

[G.O. Joe]

My hands make purple happen with high pH and ppm - with or without plenty of lime, micros, hard water.

 

[troutman]

Excessive Cal/Mag could cause a lockout of phosphorus and mess with the potassium levels as well.

I think it's being overused by many growers these days.

Cold temps could also cause purple stems.