Fertilizers & nutrients
by Plagron
Plagron Power Roots is a liquid root stimulator that accelerates root development and strengthens plant resilience during both growth and bloom cycles. Built around a concentrated formula of humic acids, vitamins and natural extracts, it gives young and established plants alike the underground foundation they need to thrive above the surface. One bottle of this stuff goes a long way — you're mixing at just 1 ml per litre of water.
Roots are everything. You can dial in your lights, perfect your nutrient schedule, and keep your climate bang on — but if your root zone is weak, none of it matters. Plagron Power Roots targets exactly that: the invisible half of your plant that determines whether the visible half flourishes or struggles.
The formula centres on humic acids, which improve nutrient uptake at the root surface by chelating minerals and making them more available to the plant. Combined with Plagron's proprietary blend of vitamins and natural extracts, you get a root stimulator that doesn't just push growth — it builds a root system that can actually handle the nutrients you're feeding. We've seen growers pour money into expensive base nutrients only to wonder why their plants look sluggish. Nine times out of ten, the roots are the bottleneck. Power Roots addresses that directly.
The other thing worth mentioning: transplant stress. Moving a plant from a small pot to a larger container — or from a propagator into its final home — shocks the root system. Power Roots helps plants recover faster after transplanting, which means less downtime between stages and more consistent growth. If you've ever watched a plant sit there doing nothing for a week after repotting, you know how frustrating that dead time can be.
Plagron keeps the ingredient list tight. Power Roots contains humic acids as the primary active component, supported by vitamins and plant extracts. Humic acids are organic compounds found naturally in soil — they improve soil structure, increase cation exchange capacity, and help roots absorb nutrients more efficiently. The vitamins and extracts in the formula support overall plant health and resilience, giving your plants a buffer against environmental stress.
The liquid is dark brown, almost black — that's the humic acids. It has a faintly earthy, peat-like smell. Nothing harsh or chemical. Shake the bottle well before each use, because the organic compounds can settle over time.
| Specification | Detail |
|---|---|
| Brand | Plagron |
| Product | Power Roots |
| Type | Liquid root stimulator |
| Active components | Humic acids, vitamins, natural extracts |
| Dilution ratio | 1 ml per 1 litre of water (1:1000) |
| Alternative dilution | 4 ml per 1 gallon of water |
| Available size | 100 ml |
| SKU | HS1877 |
| Suitable media | Soil, coco, and most substrates |
| Not suitable for | Hydroponic cultivation methods |
| Application stage | Growth and bloom cycles |
Power Roots is a root stimulator, not a miracle worker. It won't rescue a plant that's been overwatered to the point of root rot, and it won't compensate for a base nutrient that's completely wrong for your medium. Think of it as an accelerator for a system that's already heading in the right direction. If your pH is wildly off or your soil is waterlogged, fix those issues first.
The other thing to know: this product is not compatible with hydroponic setups. If you're running a DWC, NFT, or any recirculating water system, Power Roots isn't designed for that environment. Plagron is clear about this, and we'd echo it — stick to soil or coco for this one. If you're growing hydro, look at a root stimulator specifically formulated for water culture systems.
Also, 100 ml sounds small, but at 1 ml per litre, that's 100 litres of mixed solution. For a small tent with 2-4 plants, this bottle will last you through an entire cycle and then some.
There are plenty of root stimulators on the market, so what makes Power Roots worth picking? The humic acid base is the key differentiator. Some root stimulators rely heavily on synthetic hormones or single-ingredient formulas. Plagron's approach combines humic acids with vitamins and extracts for a more rounded effect — root growth plus improved nutrient availability plus stress resilience. It's a three-in-one approach rather than just pushing root mass.
| Feature | Plagron Power Roots | Typical synthetic root stimulator |
|---|---|---|
| Primary active | Humic acids + vitamins + extracts | Synthetic auxins or single-compound |
| Dilution rate | 1 ml per 1 litre (1:1000) | Varies, often 1:500 or stronger |
| Transplant support | Yes — reduces recovery time | Sometimes, depends on formula |
| Compatible media | Soil, coco (not hydro) | Often universal including hydro |
| Nutrient uptake improvement | Yes — humic acids chelate minerals | Typically no |
| Application stages | Growth + bloom | Often growth phase only |
We'd pick Power Roots over a basic synthetic root stimulator for soil and coco growers, especially if you're running Plagron's full nutrient line — the products are designed to complement each other. If you're growing hydro, though, you'll need to look elsewhere.
Running Plagron nutrients already? Power Roots pairs naturally with Plagron Alga Grow and Plagron Alga Bloom for a complete organic feeding schedule. If you're setting up a new grow, grab a grow tent and a decent light alongside your nutrients — roots respond to what happens above ground just as much as below it.
We've been stocking Plagron products since the early days of the shop, and Power Roots is one of those quiet workhorses that doesn't get the hype of flashy bloom boosters but arguably does more for your final result. The growers who come back for it tend to be the ones who've learned — sometimes the hard way — that root health is the foundation everything else sits on. One customer told us he'd been chasing deficiency symptoms for months before realising his root zone was the problem. A bottle of Power Roots and two weeks later, his plants looked like different organisms.
The 1:1000 dilution ratio is genuinely economical. At 100 ml per bottle, you're getting 100 litres of working solution. For a small home grow, that's easily a full cycle. We've had people come in asking for the larger bottles, only to realise they still hadn't finished the 100 ml from last round.
No. Plagron explicitly states that Power Roots is not suitable for hydroponic cultivation methods. It's designed for soil, coco, and similar substrates. For hydro setups, look at a root stimulator formulated for recirculating water systems.
Add 1 ml of Power Roots per 1 litre of water, giving you a 1:1000 dilution. For US gallon measurements, that's 4 ml per gallon. Use a syringe for accuracy — at this concentration, even small deviations matter.
Yes. Power Roots is designed for use during both the vegetative growth phase and the bloom cycle. Healthy roots continue to play a critical role in nutrient uptake throughout flowering, so ongoing root support makes sense.
Overconcentration can stress your plants rather than help them. Stick to the recommended 1 ml per litre. More is genuinely not better with root stimulators — you're aiming for consistent, moderate support, not a one-off drench.
At 1 ml per litre, a single 100 ml bottle produces 100 litres of working solution. For a small home grow with 2-4 plants, that's typically enough for an entire growth cycle, sometimes more.
Absolutely. Power Roots is designed to integrate with Plagron's full nutrient range, including Alga Grow and Alga Bloom. Check Plagron's feed charts for the recommended schedule when combining products.
That's one of its strengths. The humic acids and extracts in Power Roots support faster root recovery after transplanting, reducing the downtime plants typically experience when moved to a new container or growing environment.
Last updated: April 2026
