Plagron Bat Guano — Organic Phosphorus Fertiliser for Growth and Flowering
Best for: Organic growers who want a single, slow-release fertiliser that covers both growth and flowering without the hassle of weekly dosing
Our thoughts
This is proper organic fertilising made simple. Plagron Bat Guano does the job from seedling through to finish, doesn't burn plants if you stay in range, and actually improves taste and aroma along the way. One product, two phases, certified organic — that's the appeal. If you're after straightforward, reliable nutrition without mixing multiple bottles, worth a serious look.
Plagron Bat Guano is a certified organic fertiliser blended from bat manure and seabird guano, formulated as a slow-release soil amendment that works across the entire growing cycle. It's a single product that covers both vegetative growth and flowering phases, which simplifies your feeding schedule and cuts out the need for phase-switching. The phosphorus-rich profile promotes root development, strengthens flowering, and contributes to enhanced flavour and aroma in the final produce.
How it compares
Bat guano sits in the premium organic tier of soil amendments.
- More balanced nutrient profile than blood meal or bone meal alone
- Slow-release means fewer applications — typically one or two per growing cycle rather than weekly feeding
- Certified organic (Control Union), so it's legitimate for organic cultivation
- Higher upfront cost than synthetic alternatives, but dosing flexibility saves money long-term
Where guano wins is simplicity and results. You're paying for convenience and quality — not hype.
Usage guidance
Soil mixing (potted plants)
Mix 10–20g per litre of potting soil when potting up. Or top-dress with 50–100g per plant during the flowering phase and repeat every 4–6 weeks if needed.
Full soil beds
Apply 200g per square metre as a top-dressing, or work 20 litres per 100m² into the top layer.
Liquid application
Add 2 litres of guano per 100 litres of water for a nutrient boost during watering. Works well as a mid-cycle feed.
Timing note
Avoid seedlings — guano is nutrient-dense and can overwhelm very young plants. Use from week 3–4 onwards. It's forgiving once plants are established, so slight overdosing won't cause burn.
Technical specifications
- Composition: Bat manure and seabird guano mixture
- NPK ratio: 3–15–4
- Nitrogen: 3% (organically bound)
- Phosphorus (P₂O₅): 15% (water-soluble)
- Potassium (K₂O): 4% (water-soluble)
- Type: Certified organic (Control Union certified)
- Release rate: Slow-release
- Available sizes: 1L, 10L, 25L bags
Who this is for
- Organic growers wanting certification-compliant nutrition
- Growers tired of complex multi-bottle feeding schedules
- Anyone looking to improve flavour and aroma in their final produce
- Container and potted plant growers where soil amendments are practical
- Serious hobbyists and small-scale producers building a sustainable system
Our take
Plagron Bat Guano is a solid, certified-organic fertiliser that does exactly what slow-release guano should do — feed plants properly across two growing phases without weekly fussing. The phosphorus-rich mix genuinely improves root development and end-product quality, and the fact it's one product from start to finish cuts down decision fatigue.
It's not cheap, but the dosing flexibility and simplified feeding schedule make it good value for organic growers who know what they're after. Good time to buy while stock lasts.
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