Supermix 25 l plagron

Supermix 25 l plagron

Plagron is a Dutch leader with decades of experience formulating high-performance substrates and organic solutions. Supermix 25L was created to make life easier for growers looking to enrich their base soil with a complete and stable amendment capable of feeding crops for several weeks, activating microbial life, and improving soil structure both indoors and outdoors. Its blend of natural raw materials transforms any neutral substrate into a fertile, balanced, and productive medium.

Main characteristics

• Complete organic amendment to mix with soil or coconut
• Gradual release nutrition for the entire vegetative cycle and early flowering phases
• Activates beneficial microbiology and improves substrate structure
• Provides aeration, water retention and stable fertility
• Helps stabilize the pH of the medium and facilitates the absorption of nutrients
• Ideal for revitalizing used substrates and preparing custom mixes
• Suitable for indoor and outdoor cultivation, and compatible with automatic drip irrigation.
• Easy to use for both transplants and top dressing
• 25-liter format, high performance and clean handling
• Approximate weight of the container: 12 kg

Indoor and outdoor growing methods with Plagron Supermix 25 l

Indoors

For pots with base soil or inert mixes such as coco coir, add between 5% and 20% of Supermix by volume depending on the variety's needs and light intensity. Mix evenly, moisten with water, and let stand for 24–48 hours before planting to activate the biological activity. In crops with high demand or long cycles, you can reinforce with light top dressing during flowering. Keep irrigation at a steady rate and monitor the plant before supplementing with liquid fertilizers.

Outdoors

In poor or compacted soils, mix 1 part Supermix with 3–4 parts local soil or universal potting mix, improving aeration and nutrient retention. In planting holes, integrate the amendment throughout the entire volume, water to settle, and apply a layer of mulch to retain moisture. For outdoor pots, use medium doses (10–15%) and adjust with top dressing mid-season if the plant requires it.

Seedlings and cuttings

Start with low doses (5–8%) to avoid excess nutrients in tender roots. Increase the proportion gradually after the first transplant.

Reuse of substrates

At the end of the cycle, remove thick roots and add 10–30% Supermix to the used soil. Moisten and let it settle to reactivate microbial life before replanting.

Effects of Supermix 25 l Plagron

• Early root vigor and improved rooting after transplanting
• Balanced growth with compact internodes and healthy green leaves
• Dense and homogeneous flowering thanks to a stable nutritional base
• Greater tolerance to water and thermal stress due to better environmental structure
• Less need for pH and EC corrections when used correctly

Technical data sheet for Plagron Supermix 25 l

• Type: Solid organic amendment for mixing with substrates
• Main use: Soil and coco enrichment; revitalization of used substrates; topdressing
• Raw materials: A mixture of natural components such as worm humus, selected vegetable guanos and compost, natural flours and minerals, soil conditioners and trace elements.
• Nutrient release: Gradual, designed for several weeks depending on dose and conditions
• Recommended medium: Soil and coco coir; suitable for pots, raised beds, and direct soil.
• Guideline dose:
• Base mix: 5–20% by volume (0.5–2 L per 10 L of substrate)
• Top dressing: thin layers of 0.5–1 cm, adding to the watering
• Substrate reuse: add 10–30% by volume
• Working pH of the medium: 6.0–6.8 (adjust irrigation to the target range of your crop)
• Indicative EC of the final substrate: depends on the dosage and the base substrate; work within moderate ranges and increase only if the plant requires it.
• Compatibility: Organic and mineral fertilizers; drip irrigation (homogeneous mixture to avoid clogging)
• Safety: Non-phytotoxic; avoid overdosing in seedlings and high salinity conditions.
• Storage: Keep tightly closed, in a cool, dry place, protected from direct light.
• Format: 25 liters
• Approximate weight: 12 kg
• Manufacturer: Plagron (Netherlands)

Frequent questions

Do I need liquid fertilizers if I use Supermix?

In the first few weeks, medium doses are usually not necessary. Monitor the crop and, if you detect a need (especially in advanced flowering, demanding varieties, or high light intensity), supplement with specific liquids.

Is it good for coconut?

Yes. Coco is an inert medium: use Supermix to provide nutritional reserves and microbial life. Adjust watering and monitor EC, as coco drains and requires more frequent replenishment.

Can I use it in drip irrigation?

Yes, since it's a solid amendment that mixes with the substrate, it shouldn't clog drippers. It prevents coarse particles from entering the line and performs regular system maintenance.

Is it suitable for autoflowering?

Yes. Use low or medium doses, since the cycles are short and autoflowering plants are sensitive to excess nutrients in the early stages.

Can it “burn” young plants?

Only if the dosage is exceeded. For seedlings and cuttings, use reduced doses and increase them after the first transplant.

Can soil be reused with Supermix?

Yes. This is one of its great advantages: remove root debris, add Supermix, moisten, and let it rest to reactivate soil biology before replanting.

Final advice

Adjust the dosage to your genetics, environment, and watering method. Start conservatively, observe the plant's response, and scale back only if necessary. With a well-established foundation, the rest of your nutrition plan becomes simpler and more predictable.