Dark Earth Black Magic Super Soil (Terreau vivant de première qualité) - 37,85 litres

Perlite is important because it increases root-zone oxygen and improves drainage, helping roots stay healthy and active; it’s unique because its main benefit is physical structure and airflow—not nutrients or moisture storage—so it fixes “too wet and compact” root problems in a simple, predictable way.

Earthworm castings are both, but they’re unique because they feed gently while also improving how the root zone holds moisture, nutrients, and beneficial biology. They matter most for stability, helping roots absorb nutrients more consistently instead of relying on big feeding spikes, which is why they’re often more “conditioning” than a strong fertilizer.

Fish compost feeds plants slowly while also feeding the soil microbes that release nutrients over time, so growth becomes steadier and roots often perform better. It’s unique because it tends to be more nutrient-dense and biologically active than many other composts, which can boost green growth faster but can also cause excess nitrogen or soggy, low-oxygen media if overused.

Biochar acts like a long-lasting storage and habitat material in the root zone, helping soil hold water and nutrients more evenly while keeping better airflow for roots. It’s important because it can make plants more resilient to watering and feeding swings, and it’s unique because it’s not a fertilizer or compost substitute, but a stable, porous carbon structure that buffers the whole soil environment over time.

Alfalfa meal is important because it supports steady, biologically driven growth instead of a quick spike, helping the root zone stay active so nutrient flow stays consistent. What makes it unique is that it can encourage stronger growth momentum while also feeding soil life, which helps plants stay vigorous and resilient when conditions are right.

Feather meal supplies slow-release nitrogen that supports steady green growth over time, especially once roots and soil microbes are active. It’s unique because plants can’t use it immediately the way fast nitrogen sources work, so it’s best for building a long-term baseline rather than fixing a sudden deficiency overnight.

Fishbone meal slowly supplies phosphorus and calcium that help roots expand and build stronger plant structure over time, which makes it unique compared to fast nutrients that spike quickly and fade. This steady release supports long-term stability while reducing sudden feeding swings that can lead to stress and imbalances.

Crustacean meal is valued because it releases nutrition slowly while also feeding a specific kind of soil biology through its shell material, which can support a healthier, more resilient root zone. It is unique because it is not only a nutrient source, but also a chitin-rich amendment that helps build steadier plant performance over time rather than creating a fast, short-lived growth spike.

Humic acid is important because it improves root health and nutrient uptake by keeping minerals available, stabilizing the root zone, and supporting beneficial biology, which makes growth more consistent. It’s unique because it doesn’t act like a direct nutrient boost—its main power is improving the root environment so plants can use what’s already there more efficiently.

Basalt rock dust is used to slowly build mineral diversity and soil stability so plants can grow with fewer nutrient swings and stress problems over time. It’s unique because it works through gradual weathering and soil biology rather than giving a quick, strong nutrient hit like fast fertilizers do.

Fish protein hydrolysate supplies small amino acids and peptides that can be used quickly as building blocks for new tissue, making it especially helpful for recovery and steady growth when demand is high. It’s unique because the protein is already broken down into fast-available forms, so it can support plants more quickly than heavier, slower fish-based inputs while still requiring careful dosing to avoid soft growth and root-zone oxygen issues.

Copper sulfate is useful because it releases copper quickly, which can correct a true copper deficiency and support enzyme activity, strong new growth, and healthy tissue formation, but it’s risky because that same fast, reactive copper can burn foliage, stress roots, and accumulate in growing media if conditions like low pH or repeated use make copper too available compared with gentler copper sources.

Peat moss is valuable because it holds moisture evenly and creates a gentle rooting environment, but it isn’t universal because it can stay too wet, compact over time, and naturally lowers pH. It’s most effective when balanced with airy materials so roots get oxygen, which is what makes it different from ingredients that mainly add structure without changing moisture and acidity as much.

Kelp meal supports balanced growth and stronger roots by gently enhancing root-zone biology and helping plants handle stress more smoothly than fast-acting inputs, making it unique as a steady “support” amendment rather than a quick nutrient fix.

Insect frass is unique because it supports plants in two ways at once: it offers mild, steady nutrition while also delivering chitin-related signals that can help “prime” the root zone and plant defenses. That combination makes it especially valuable for building resilience and consistency, not just pushing fast growth like many stronger inputs.

Oyster shell flour slowly releases calcium carbonate to buffer the root zone and help keep nutrient uptake steady over time, which makes it different from fast-acting calcium sources that work quickly but don’t stabilize pH for long. It’s important because stable root-zone conditions reduce pH swings that can trigger deficiency-like symptoms even when nutrients are present.

Yes, but it works best as a slow, soil-building phosphorus source that supports steady root development and smoother transitions into flowering over time. Its uniqueness is that it feeds gently and gradually, helping reduce sudden phosphorus swings compared with fast-acting sources that can cause lockouts or imbalances when overapplied.

Gypsum is important because it supplies calcium and sulfur while improving soil structure, helping roots breathe and water soak in more evenly, and it is unique because it does this without significantly raising soil pH like lime-based calcium sources.

Wollastonite supplies calcium and plant-available silicon that help plants build stronger tissues and handle stress more consistently, especially during fast growth. It’s unique because it delivers silicon and calcium together in a slow, steady way that supports structure without acting like a quick-fix fertilizer.

Volcanophos builds a slow, steady phosphorus reserve in the root zone to support stronger rooting, smoother early growth, and better flowering readiness. It’s unique because it delivers phosphorus as a volcanic mineral amendment that also contributes calcium and trace minerals, making it more of a long-term soil foundation than a quick, highly soluble phosphorus boost.

Sulfate of potash supplies potassium for water control and sugar movement plus sulfur for protein building and quality compounds, helping plants finish stronger without adding chloride like some other potassium sources.

Zinc sulfate supplies plant-available zinc to quickly correct zinc deficiency, helping restore normal new leaf expansion and steady growth at the tips. It’s important because zinc is needed in tiny amounts but strongly affects growth regulation, and zinc sulfate is unique for its predictable solubility and fast correction compared to slower zinc sources.

Manganese sulfate supplies manganese, a micronutrient that helps plants run key photosynthesis and enzyme processes, so new growth stays properly green and growth doesn’t quietly stall. It’s unique because it delivers manganese in a simple, fast-available form that responds strongly to root-zone conditions, so getting pH and balance right matters as much as adding the nutrient.

Yucca extract helps water spread and soak into growing media more evenly, reducing dry pockets and channeling so roots can access moisture and dissolved nutrients consistently. It’s unique because its main benefit is improving water behavior rather than directly feeding the plant like most inputs.