Lightweight peat-free compost for seedlings and pot growing, 50 L
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16,90 €
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Light Mix is a 50 L organic compost made from composted pine bark, coir, wood fibre and perlite. Its fertilisation is deliberately light, at 2 kg of organic NPK 6-3-4 fertiliser per cubic metre.
This way you stay in control of nutrition from day one, instead of depending for several weeks on the compost's own reserves. It can be used in organic farming.
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The summary
- What it is: a 50 L peat-free organic compost, made from composted pine bark, coir, wood fibre and perlite.
- Lightly fertilised: it contains 2 kg of NPK 6-3-4 organic fertiliser per cubic metre, which leaves you in control of feeding.
- Its three values: the pH is 6, the conductivity 30 mS/m and the water retention 450 ml per litre of grow medium.
- What it is for: it suits seedlings, cuttings, pot growing and soil improvement in borders.
- Organic farming: this compost can be used in certified production.
- Size: the bag holds 50 L and weighs 15.6 kg.
Organic compost 50 L, lightly fertilised, pH 6, for seedlings, cuttings and pots
Terra Aquatica's Light Mix is a 50 L organic peat-free compost, based on composted pine bark, coco coir, wood fibre and perlite. It is deliberately lightly fertilised, at 2 kg of organic NPK 6-3-4 fertiliser per cubic metre, which leaves you in control of the nutrition. With a pH of 6, it suits seedlings, cuttings and pots.
Light Mix is a growing compost designed so that you decide on the nutrition. Its fertilisation, 2 kg of organic NPK 6-3-4 fertiliser per cubic metre, is deliberately light, whereas a general-purpose compost carries the plant for 6 to 8 weeks on its own reserves. With this one, nutrition begins with your first feed, which is what makes it a medium for seedlings and for controlled growing.
🧱 What the bag contains
Composted pine bark
It provides structure, with particles that do not compact and let air circulate for months.
Coconut fiber
It provides water retention and makes up the 450 ml per litre of the mix.
Wood fibre
It lightens the mix and helps aerate it, along with the bark and perlite.
Perlite
It is an expanded volcanic rock, incompressible. It keeps air in the mix even when wet and packed down.
🌱 A growing medium you control
With a rich compost, the nutrition partly escapes your control. Its reserve is released at its own pace, unrelated to the plant's growth stage, and it adds to what you supply. With a lightly fertilised medium, what the plant receives is what you have poured in, and you adjust the formula between growth and flowering. Three values characterise this compost: a pH of 6, the range where most nutrients remain available, a very low conductivity of 30 mS/m, and a retention of 450 ml per litre, or about 22 litres of water held per bag.
The low salt content is exactly what a young root needs, whereas a rich potting compost would burn it, and that is why this mix is used first for seedlings and cuttings. It is then suitable for pot growing with a complete fertiliser, and for improving a border when mixed with the soil already in place. At the end of the crop, it goes onto the compost heap or the vegetable garden. The article on the indoor seedling area covers this stage in detail.
Fertiliser from the very first watering
At the same time, plan on a complete fertiliser, since feeding starts with the very first watering. This potting mix is deliberately low in nutrients, so it is your fertiliser that carries the plant, and you adjust its formula between growth and flowering. A pH test is a useful addition, as the pH of the irrigation water determines what the plant can actually absorb.
It does not go in a water circuit
This potting compost is made for a watered pot, not for a system where water circulates. For a continuous irrigation pot or an ebb and flow table, choose clay pebbles or coco coir, which hold up in a circuit. Organic compost placed in a film of water releases its fine particles, clouds the solution and ends up in the pump, while losing the structure that makes it useful.
🍄 A living mix
This compost is rich in beneficial micro-organisms, bacteria and fungi that colonise the root zone. They take part in the slow breakdown of the organic fraction, and so in the gradual release of the organic fertiliser in the mix. They thrive in a moist, airy grow medium at ordinary temperature, which are the conditions of an indoor seedling tray. Two things destroy them: sterilising the compost in the oven or microwave, and a systemic fungicide treatment, which does not distinguish between fungi. If you raise your seedlings in this mix, avoid sterilising it and keep treatments for proven cases.
📦 The 50-litre bag
The 50 L bag fills around fifty one-litre pots, or about ten 5-litre pots, which comfortably covers a season of seedlings for a home gardener. The bag can be resealed and kept from one year to the next as long as it stays dry and frost-free; the structure of the mix does not break down, but the organic fraction slowly diminishes. Compost left for 2 years in a damp shed settles and loses some of its aeration, which can be remedied by mixing in a handful of perlite before use.
Technical specifications
The essentials
- Volume
- 50 LThe bag weighs 15.6 kg dry, and a good deal more once the grow medium is wet.
- Composition
- Bark, coir, wood, perliteComposted pine bark, coconut fibre, wood fibre and perlite, in a ready-to-pour mix.
- Pre-fertilisation
- 2 kg/m³, NPK 6-3-4Organic fertiliser, at a light feed: provide nutrients from the very first watering.
- pH
- 6This is the zone where most nutrients remain available to the plant.
- Conductivity
- 30 mS/mA low value, which suits young roots and confirms the low fertiliser load.
- Water retention
- 450 ml/LA 50 L bag therefore holds about 22 litres of water.
To budget for separately
- Fertilizer
- A complete fertiliserFeeding starts with the very first watering and continues throughout the cycle.
- Containers
- Seedling pots or traysWork out the volume before ordering: 50 L fills about fifteen 3 L pots.
In the box
- 1 bag of Light Mix potting compost of 50 L, weighing 15.6 kg dry.
Volume, pH, conductivity, water retention, pre-fertilisation and the organic farming mention taken from the bag, composition and weight from the manufacturer's shop, on 08/10/2026. The fifteen or so 3 L pots is an order of magnitude calculated from the volume of the bag.
Manufacturer and product safety
- Manufacturer
- TERRA AQUATICA (SAS, SIREN 840329619), ex General Hydroponics Europe
- Postal address
- 4 boulevard du Biopole, ZI du Biopole, 32500 Fleurance, France
- Contact
- info@terraaquatica.com ; +33 5 62 06 08 30
- Website
- www.terraaquatica.com
Information provided under Regulation (EU) 2023/988 on general product safety.
Light potting compost or coco fibre?
Two growing media, for two ways of managing nutrition.
A compost-based mix or a neutral medium
If the water circulates or flows back up in your setup, go for coir without hesitation: the organic particles in a potting compost break down and end up in the pump. The questionnaire will help you decide in all other cases.
| Contains a little fertiliser | You decide on all the inputs | Tolerates a missed fertiliser dose | Seedlings and cuttings | Pot cultivation | Circulating system | Flood table | Volume (L) | Weight (kg) | Reusable over several cycles | |
|---|---|---|---|---|---|---|---|---|---|---|
| Recommended Lightweight peat-free compost for seedlings and pot growing, 50 LYour choice | Yes | No | Yes | Yes | Yes | No | No | 50 L | 15.6 kg | No |
| 50 L coco fibre, natural or with perliteYour choice | No | Yes | No | Yes | Yes | Yes | Yes | 50 L | 12.5 kg | Yes |
Lightweight peat-free compost for seedlings and pot growing, 50 LRecommended
Nutrition
Contains a little fertiliserYes
You decide on all the inputsNo
Tolerates a missed fertiliser doseYes
Use
Seedlings and cuttingsYes
Pot cultivationYes
Circulating systemNo
Flood tableNo
The bag
Volume (L)50 L
Weight (kg)15.6 kg
Reusable over several cyclesNo
50 L coco fibre, natural or with perlite
Nutrition
Contains a little fertiliserNo
You decide on all the inputsYes
Tolerates a missed fertiliser doseNo
Use
Seedlings and cuttingsYes
Pot cultivationYes
Circulating systemYes
Flood tableYes
The bag
Volume (L)50 L
Weight (kg)12.5 kg
Reusable over several cyclesYes
Composition, weight and uses taken from the bags and the manufacturer's shop, on 08/10/2026. The two bags complement each other: a crop can start in light compost and carry on in coir.
Help choosing
Light potting compost or coco coir
Documents & manuals
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50 L bag weighing 15.6 kg. Volume matters more than weight when calculating shipping: a bag of potting compost takes up the space of several ordinary parcels. The exact charges and final delivery times are shown in your basket once you have entered your address. Outside the European Union, import duties and taxes are payable by the recipient. Delivery times run from the date of dispatch, excluding public holidays.
Frequently asked questions
8 questions
6 key questions, 8 in the detailed view
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