Stop Chasing Ghosts Rethinking Your Coco & Cal-Mag
Look, we’ve all been there. You walk into the tent, eyes bleary, coffee in hand, and you see it: those brown spots. The classic “Cal-Mag deficiency” red alert. You reach for the bottle, mix it heavy, and… nothing. The problem keeps moving. It’s frustrating, and honestly, it’s enough to make you want to throw the tent or the dang plant out the window!
We wanted to share some stuff that’s helped us stop “chasing” deficiencies in our coco/perlite setup. This isn’t a “how-to-be-the-perfect-grower” guide—because honestly, there is no right or wrong way to do this. We’re all just trying to figure out what our plants are asking for.
Coco is a “Thief” (But That’s Okay)
If you’re mixing your own coco/perlite, remember that coco has a mind of its own. It’s got a high Cation Exchange Capacity (CEC), which basically means it likes to “hoard” calcium and magnesium, often snatching it away before your plants can get to it.
Instead of fighting the coco, we started “pre-loading” it. We use a mineral-based powder (like Roots Organics Elemental) as a baseline. Think of it as keeping the fridge stocked. It’s not an instant fix, but it keeps the “thief” (the coco) full so it leaves the food for the plants.
The “Pure Water” Variable
We happen to use rainwater in our setup. It’s basically a blank slate. If you’re using tap water, you might have extra minerals already in there that you didn’t account for, which can lead to lockout.
The tip here? Know your baseline. Whether it’s rain, RO, or tap, knowing what’s in your water before you add nutrients is the best way to stop the guesswork. When we started looking at our water as a foundation rather than just a carrier, our plants stayed that deep, lush green we were looking for.
3. Mix & Match The “Foundation vs. Insurance” Approach
We found that relying on just one bottle of liquid “Cal-Mag” was like trying to fix a leak with a piece of tape. We now use a two-pronged strategy that’s made life a lot easier:
The Foundation (Dry Minerals) Using a powder like Elemental as a top-dress or initial mix creates a slow-release buffer. It’s the “slow and steady” part of the equation.
The Insurance (Liquid Helpers) We use a liquid additive (like Earth Juice OilyCann) in our reservoir. Because it’s got humic acid, NO nitrogen, it acts like a delivery driver that escorts nutrients right into the roots. If a specific plant looks like it needs a little extra, we have that liquid “insurance” ready to go without having to overhaul the whole system.
Don’t Be Afraid to Tinker
The biggest takeaway we’ve had is this: Don’t be scared to try different things. If your plants are throwing a tantrum and the standard “Cal-Mag” isn’t doing the trick, don’t just add more of the same.
Look at the ingredients: Is your liquid heavy on nitrogen? Maybe that’s why you’re getting clawed leaves.
Look at the delivery: Maybe your plants just need a little humic acid to help them “unlock” what’s already in the soil.
The Bottom Line
At the end of the day, you’re the one in the room with the plants. They’re telling you a story every day. If you’re constantly “chasing” problems, try stepping back, checking your baseline, and experimenting with a different type of supplement. Sometimes, the “best” way to grow is just the one that finally lets you put the bottle down and enjoy the grow. Let others know what type of cal mag are you using? Share your comments!
