Plagron All Mix 50L — Pre-Fertilised Potting Soil for Established Indoor Growers
Best for: Intermediate growers wanting a balanced, nutrient-rich substrate that does the feeding legwork for 4–6 weeks
Our thoughts
All Mix is a proper soil for growers past the seedling stage. It's heavily pre-fertilised with worm castings and organic nutrients, so you get weeks of growth without reaching for a feeding bottle. Solid choice for anyone moving to larger pots or looking for a hands-off growing medium that actually works.
Plagron All Mix is a ready-to-use, pre-fertilised potting soil designed to deliver comprehensive nutrition for 4–6 weeks without additional feeding. Built from a carefully balanced blend of peat, perlite, worm humus, and organic fertiliser (NPK 5.5–11–5.5), it creates a living rootzone that sustains vigorous growth across all growing stages. The worm castings boost biological activity and water retention, while the perlite keeps the medium light and well-draining. This is organic-certified substrate that mimics rich outdoor soil—proper kit at a sensible price.
How it compares
All Mix sits in the balanced, all-stage bracket of the Plagron range.
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vs Light Mix: Light Mix has minimal pre-fertilisation (ideal for seedlings). All Mix is heavier, suited to established plants only
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vs Bat Mix: Bat Mix leans hard into flowering with higher phosphorus. All Mix balances veg and flower equally
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vs BioBizz All Mix: Similar concept and price tier; comparable nutrient window; Plagron's version slightly lower EC, marginally easier for beginners
In short: All Mix bridges the gap between seedling starter soils and specialist flowering mixes. It's the workhorse for intermediate growers.
Usage guidance
Plant maturity:
Use All Mix only for established plants at least three weeks old. The NPK profile is too strong for seedlings or young clones—risk of nutrient burn. Start those in Light Mix, then pot up into All Mix once they're past the delicate phase.
Pre-use watering:
Water abundantly before planting to flush out any excess nutrients that could shock younger tissue. Let it drain fully, then pot in.
Feeding timeline:
You'll get 4–6 weeks of solid growth without supplements. After that window closes, switch to Plagron Alga Grow (veg) or Alga Bloom (flower), or your nutrient brand of choice. Works with any regime.
Container choice:
Suits fabric pots, hard pots, grow bags—anything that allows drainage. The perlite and worm castings handle water retention well, so you're not fighting a soggy rootzone.
Technical specifications
- Volume: 50 litres per bag
- Product code: Plt-60
- Pallet quantity: 60 bags
- Composition: Peat moss, perlite, worm humus, organic fertiliser blend
- NPK profile: 5.5–11–5.5
- Pre-fertilisation duration: 4–6 weeks
- EC (electrical conductivity): Moderate; suitable for established plants only
- Certification: CU certified organic
- pH: Neutral to slightly alkaline (typical peat-based range)
Who this is for
- Growers moving from seedling to productive stage who want a nutritionally complete medium
- Intermediate and experienced growers tired of constant feeding schedules
- Anyone running multiple pots where a pre-fertilised base cuts preparation time
- Organic-certified growing operations seeking a proven, certified substrate
- Growers who want biological activity (worm castings) without guesswork
Our take
All Mix does exactly what a pre-fertilised soil should do—feed your plants properly for weeks without fuss, then hand over to your nutrient programme. The worm castings mean you're growing in a living medium, not inert peat, and that shows in plant response.
Not for seedlings, not for budget-conscious growers trying to stretch one bag across everything. But for anyone with established plants and a bit of growing time under their belt, it's straightforward and reliable. Good time to buy while stock lasts.
