Plagron Supermix 10L – Organic Soil Fertilizer for Explosive Growth & Living Soil

Plagron Supermix 10L is your all-in-one organic soil booster, engineered to supercharge your growing medium with life, structure, and long-term fertility—so your plants grow faster, flower harder, and resist stress like pros.

Are cheap or synthetic fertilizers leaving your soil dead and your yields flat?

Let’s be real: most fertilizers give you a quick boost but leave your soil exhausted after a few grows. You end up with compacted, lifeless dirt that needs constant feeding, more pH tweaks, and extra additives just to keep plants alive. It’s exhausting, expensive, and the results? Mediocre at best.

What if your soil could work for you instead of against you?

Imagine a substrate that keeps giving—season after season—without constant babysitting. No more nutrient lockouts, weak roots, or sad, underperforming plants. Just rich, living soil that feeds itself and your crops naturally. That’s the promise of true organic growing. And that’s exactly what Plagron Supermix delivers.

Meet your soil’s new best friend: Plagron Supermix 10L

Supermix isn’t just another fertilizer—it’s a living ecosystem in a bucket. Packed with worm castings, seabird guano, beneficial microbes, basalt flour, and calcified algae, it rebuilds your soil from the ground up. It’s CU-certified organic, so you know it’s clean, safe, and built to last. Mix it into your substrate before planting or use it to revive tired soil between grows—either way, you’re setting the stage for explosive growth and massive yields.

What this product brings to your growing game

With Supermix, you’re not just feeding plants—you’re building a thriving underground network. The beneficial bacteria and fungi colonize your root zone, breaking down nutrients and forming symbiotic relationships that protect against disease. Your plants absorb more, waste less, and grow with confidence. Whether you’re in pots or ground, indoor or outdoor, Supermix turns average soil into premium real estate.

Format, longevity, and how to get the most out of it

Supermix comes in a ready-to-use 10L bucket—no mixing, no mess. It’s a dry, granular amendment that blends easily into any peat-based substrate. Once mixed in, it slowly releases nutrients over time, feeding your plants through every stage.

• Use 2–5% Supermix in potting mixes (2–5L per 100L of soil)
• For ground cultivation, apply 10L per 100m²
• Best used in peat substrates like Plagron Royalmix, Allmix, or Promix
• Does not work with coco or hydro substrates
• Store in a cool, dry place to preserve microbial life
• Mix thoroughly for even distribution and maximum effectiveness
• Reapply between grows to maintain soil vitality

Why Supermix is worth every penny

• Reduces liquid fertilizer use – packed with slow-release nutrients, so you feed less often
• Improves soil structure – basalt and bentonite enhance aeration and water retention
• Stabilizes pH naturally – thanks to calcified red algae and basalt flour
• Boosts plant immunity – microbes protect roots and prevent disease
• Increases yield quality – richer terpene profiles and denser flowers
• Saves money long-term – one bucket lasts multiple grows when used correctly
• CU-certified organic – safe for people, pets, and the planet

Pro tips to stretch your Supermix further

Make the most of your Supermix with these smart hacks. First, blend it into fresh soil before planting—don’t wait. Second, layer it at the bottom of large pots to create a nutrient reservoir. Third, combine it with Light Mix Soil for a balanced, ready-to-grow medium. And if you’re reviving old soil, mix in 10% Supermix and let it rest for a week—your next grow will thank you.

Frequently Asked Questions

How long does a 10L bucket of Supermix last?

Depending on your setup, one 10L bucket can enrich up to 500L of soil (at 2%) or cover 100m² of outdoor ground. For indoor growers using 10–20L pots, it can last 3–5 full grows.

Do I need to use liquid fertilizers if I use Supermix?

You’ll still need some liquid feeding, especially in heavy flowering, but Supermix drastically reduces your reliance on bottles. Think of it as your soil’s foundation—strong, stable, and self-sustaining.

Can I reuse soil after using Supermix?

Absolutely. In fact, that’s one of its superpowers. After harvest, refresh your soil with another 5–10% Supermix, and it’s ready for the next cycle. Your plants will love the continuity.

Is Supermix good for autoflowers?

Yes! Mix it into your soil at the start, and your autos will cruise through their short life with steady nutrition. Just avoid overfeeding—autos don’t need extra boosts.

Can I mix Supermix with other Plagron products?

Yes. It works perfectly with Light Mix, Royalmix, or Batmix. Just remember: these soils are pre-fertilized, so skip Supermix on the first grow unless you’re extending the cycle.

Personal Experience of Pevgrow’s CEO (Alan)

I’ve tested a lot of soil amendments, but Supermix is one I keep coming back to. Last season, I used it in my outdoor beds mixed with Light Mix, and the difference was night and day—darker green, stronger stems, and way fewer pest issues. I didn’t need half the liquid feeders I usually do, and the harvest was juicier than ever. What I love most is how it builds over time. I reused that soil this year with a 5% refresh of Supermix, and it performed like new. It’s not the cheapest upfront, but when you calculate the savings on nutrients, time, and plant health, it’s a no-brainer. My tip? Don’t skimp on the mix ratio—go full 5% for pots, and your roots will throw you a party.