Plagron Feed Chart – Cocos A+B Doses, EC and pH
Plagron's own published 100% COCO schedule. Millilitres per 10 litres of water, week by week.
- All dosesper 10 litres
- pH5.5 – 6.5
- Base feed15–35ml of each part
- Run10 weeks, then harvest
Plagron Hydro A+B
Same schedule shape for their hydroponic line, at slightly lower rates.
| Week | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
|---|---|---|---|---|---|---|---|---|---|---|
| Hydro A & B (each) | 14ml | 16ml | 18ml | 20ml | 22ml | 25ml | 25ml | 25ml | 25ml | 25ml |
| EC | 1.4 | 1.6 | 1.8 | 1.9 | 2.0 | 2.3 | 2.3 | 2.3 | 2.3 | 2.3 |
Every figure is millilitres per 10 litres of water. Week 11 is harvest — no feed. Plagron also publish 100% TERRA and 100% NATURAL schedules; their PDFs are on plagron.com/downloads.
Getting it right
- The EC figures already include your tap water at 0.4 mS/cm. Never let the finished solution go above 3.0 mS/cm.
- Hand feeding and system feeding are different rows. Hand feeding runs 0.2 lower for the first five weeks — use the one that matches how you actually water.
- To veg for longer, repeat the week 2 dose rather than pushing the numbers up.
- Power Roots and Sugar Royal are organic in origin, so they are not suitable for NFT, DWC or aeroponics. Plagron's Hydro Roots is the mineral equivalent for those.
- Silic Rock goes in on its own first. It has a very low pH — dissolve it fully before anything else joins the tank.
- Every dose is indicative. Plagron say so on the schedule: adjust to the plant in front of you.
Everything on the chart
Plagron Cocos A+B
From £13.49
15–35ml of each part
Plagron Power Roots
From £15.95
10ml, weeks 1–5
Plagron Green Sensation
From £58.49
10ml, weeks 6–10
Plagron Sugar Royal
From £33.49
10ml, the whole run
Plagron Hydro A&B
From £11.49
For hydroponic systems
Plagron Terra Grow
From £8.49
The soil line
Plagron Terra Bloom
From £8.15
The soil bloom feed
Plagron CalMag Pro
From £8.49
For RO and soft water
Plagron Silic Rock
From £6.49
Dissolve first, on its own
Plagron Pure Zym
From £17.49
Enzymes for the root zone
Cocos Perlite 70/30
From £13.49
Pre-buffered and ready
Plagron Lemon Kick
From £7.49
Organic pH down
Common questions
Hand feeding or system feeding — which EC row?
Hand feeding is watering by hand from a can or hose. System feeding is a pump and drippers on a timer. Plagron run the system row 0.2 higher for the first five weeks.
Can I use Cocos A+B in soil?
No. Plagron publish a separate 100% TERRA schedule with Terra Grow and Terra Bloom, at different rates. Coco and soil hold nutrients differently.
Why does the chart stop at week 10?
Week 11 is harvest on Plagron's schedule — no feed. If your run is longer, repeat the week 2 dose to extend the vegetative period rather than stretching the flowering weeks.
Which additives can I use in DWC?
Not Power Roots, Sugar Royal, Pure Zym, Vita Race or Silic Rock — all organic in origin. Plagron's Hydro Roots is the mineral alternative for recirculating systems.
Figures as published by Plagron in their 100% COCO and 100% HYDRO grow schedules, plagron.com/downloads. Always read the label on the bottle you own. Plagron is a trade mark of its owner.