How much Cal-Mag do I use?

Currently im using GH MaxiGrow, Diamond Nectar, and Cal-Mag. I want to start feeding my plants 1/4 strength nutrients with each watering vs. feed, water, water, feed, etc. So my question is should I mix the Cal-Mag and Diamond Nectar 1/4 strength too, or should those be left full strength? Feedback is much appreciated!

Forgot to add that im growing in soil. ocean forest

I always hear different things with cal-mag... most say you only need to add it once every 2-3 weeks


right now my babies are getting 3 ml of 2% calcium and .5% magnesium from dyna-gro foliage pro and then 1 ml of 2% magnesium from dyna-gro mag-pro every other water. my babies seem to like it for now...

the first 4 weeks of vigorous veg I feed only half of what is directed unless there are any signs of deficiency. After flowering starts, I lay off the cal-mag completely.

ReverendMaynard said:

the first 4 weeks of vigorous veg I feed only half of what is directed unless there are any signs of deficiency. After flowering starts, I lay off the cal-mag completely.

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whats the deal with that? Is it not good to use during flowering?

I started using Cal-Mag yesterday, after showing deficiencies cause by using RO water. I plan to use Cal-Mag throughout my entire grow and would like to hear others experiences using it from seed to weed.

dd900 said:

whats the deal with that? Is it not good to use during flowering?

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Pretty simple...I don't use RO water, it's from an artesian well that has a decent mag and cal content. In veg when they're vigorous they tend to burn through it so I add it with Cal-Max from Grotek which is also a nice little veg additive at 2-0-0.

@J2M3S : What other nutes/additives are you using?

I recommend to anyone using RO water and Cal-Mag to use 1/2 RO water 1/2 evaporated Tap (48 hrs) and 1-2ml/gal cal-mag depending on health of the plant. It's fine to use during flower...it jsut fucks with the NPK ratios because of the added nitrogen but if you kick back a little on the N-supplying nute you should be fine. When flushing for the last week or so just use RO water with 1tsp/gal molasses. Or dont...whatever you want to do. At that point you definitely dont want that shit in the bud.

i use 1tsp per gallon of water, twice a week

Cut the cal mag down when you first start using it to 1/4 strength .....along with everything else about a week into root growth for clones......I just leave em in the prop tray and fill up a cup 1/4 with nute solution from the veg room and the rest R/O water......I water em like that(for a couple weeks if I have to)until I got room in the first veg tray for a new cycle...........I like to use low strength calmag all the way through with H&G's full line, some AN supplements, and some little other secrets that i picked up along the way.....Lovin it!!........Peace

I use GH Floranova and RO water in hydro, I've found that I have to supplement with 1tsp/gal calmag+ throughout the grow.

Not if your tap water is very bad... like 1500ppm bad

I dont use tap water any way. I make sure that there is 100ppms of calmag in any amount of RO water i use even in flower every water and have no probloms i stay green all thru flower no probs!!!