CalMag
 

Anyone using MSU but at the same time supplement with CalMag on their orchids?

If you are using the MSU RO formula (13-3-15-8Ca-2Mg), in my opinion, it's not necessary to supplement it further. If your interest is magnesium, use Epsom Salt.

Yes. I use it maybe once a month. I did use epsom salts as Ray suggested initially, for I hoped a quick jolt, then I switched to calmag. Frankly, I don't see a difference on anything except my phals. I put egg shells in with my Catts.

There is something about my water which binds up the mag over time.

Thanks for your reply, Ray.

---------- Post added at 10:14 PM ---------- Previous post was at 10:13 PM ----------

Thanks Dolly.

Just curious Ray. If the MSU for well water is used, would cal-mag be necessary?

I would say that since the well water version has no magnesium (does have calcium), the necessity of adding cal-mag or epsom salts would depend on the quality of your tap/well water.

This...

Good to know. I use epsom salts because I noticed the blotching in my leaves several months back. There's visible Improvement in any new growth. Thanks for the info!