Hi, Painguy,

They are still a tad young for cal/mag, unless your water comes from volcanic soil wells or R/O filters.

In places like Florida with a limestone base, adding cal/mag to tap water is unnecessary and can get toxic.
Your water company sends an analysis once a year.
It will tell you what to expect, but watching your plants closely, will tell you what they want.

You can probably give them a few more weeks before you need to think about cal/mag.
But it does get important when they begin to flower.
It takes very little so don't overdo it.
Less is more.
Love kills!

Aloha,
Weeze
Weezard Reviewed by Weezard on . When to add cal/mag I can't find any info on when exactly to add it. The bottle says seedling, but that's too vague. The second set of leaves are just starting to show. Thanks for the help Rating: 5