About Max Yield Labs

Our Mission

One number drives everything we do: grams per square foot.

That's the scoreboard. Every input, every product, every decision at Max Yield Labs comes back to one question — does this help growers pull the maximum yield out of every square foot of canopy?

That's why we exist. Not to sell bottles with cool labels. Not to build the biggest product catalog. To help you get the most out of every plant, every cycle, every square foot you're running.

What We Stock — And Why

Every product on our shelves falls into one of two categories:

Formulated by us. Cal Mag'd Coco is our flagship — developed in-house, produced from raw inputs, with full control over the formula, sourcing, and process. Living Coco Medium, MAX Live, and MAX Cal Mag are all in development and coming soon. We know exactly what's in every product because we build them ourselves.

Meets our criteria. For the products we don't make ourselves, we hold them to a strict standard before they earn shelf space at Max Yield Labs:

• The company can explain the science behind every ingredient. Not "it works because growers love it." Actual reasoning for why each input is in the formula.
• Third-party lab testing or verifiable performance data. Claims need receipts — either independent testing or documented, repeatable results.
• Price matches value. We don't stock products where you're paying for the label, the influencer deal, or the booth at the trade show. The dollars go into what's inside the container.
• Clean inputs, traceable sourcing. No heavy metal contamination, no mystery supply chains. We need to know where the raw materials come from.
• Does one thing well. We'd rather stock a product that nails a single job than an "all-in-one" that does five things at 60%.

If a product can't clear that bar, it doesn't get listed. Simple as that.

From the Founder

I was running a high-priced nutrient line, following the feed chart, doing everything "right" — and my plants still turned yellow. I was guessing how much MKP to add, how much potassium sulfate, and nobody could give me a straight answer. So I started experimenting.

That's really what Max Yield Labs is. It's me in the grow room and the lab, testing inputs, tweaking formulas, breaking things, fixing them, and sharing everything I learn along the way. Grower to grower.

It started with Cal Mag'd Coco. I couldn't trust that the "pre-buffered" coco on the market was actually buffered — so I built the process myself. Dual-Stage Cation Exchange Saturation. Two passes of concentrated calcium nitrate and magnesium sulfate. Rinsed to ≤0.4 EC. Done here in Elmira, New York, by hand, with agricultural-grade equipment.

Once that was dialed in, I kept going. Living Coco Medium, MAX Live, MAX Cal Mag — all coming soon, all born from the same process: experiment, learn, share. If something works, I'll tell you exactly what it is and why. If something doesn't, I'll tell you that too.

I'm not here to sell you a lifestyle. I'm here to figure out how to get the most out of every square foot — and bring you with me.

— Tjark Hartmann, Founder, Max Yield Labs

Made in Elmira, NY

We're a small, hands-on operation in Upstate New York. We formulate, produce, and ship direct to growers — no distributors, no middlemen, no mystery. Every order gets personal attention because there's no other way we'd do it.

Questions about our products, our process, or your grow? Reach out. We're growers too, and we like talking shop.