Which universal soil to choose? Or Brun vs. Vilmorin

March 2026: the garden emerges from its lethargy, and every pot and planter needs a solid base to flourish. Universal potting soil is undoubtedly the world's best-selling product, but did you know that behind this term lie radical differences in composition? Between the historic performance of peat and the ecological commitment of "peat-free", Multitanks has selected three champions from Or Brun and Vilmorin to transform your garden into a fertile paradise.

Or Brun Universal: The seaweed-enriched formula

For those looking for spectacular flowering, Universal Potting Soil Or Brun 20L is an absolute reference. Its composition is a veritable nutrient cocktail: blond peat for lightness, wood fiber for aeration and, above all, the addition of horse manure composted with seaweed from the Vendée coast.

With a pH of 6.1 and a natural fertilizer NPK 5-3-8, this substrate guarantees up to twice as many flowers. Its water-holding capacity (581 mL/L) is a major asset for balconies exposed to the wind, reducing the frequency of watering while nourishing the plant over the long term.

Vilmorin Universal: balance and reliability

A long-standing alternative, Universal Potting Soil Vilmorin relies on a stable, versatile structure. It's the ideal potting soil for daily repotting of indoor plants and outdoor beds. It offers an excellent compromise between drainage and retention, avoiding the root asphyxia often seen with entry-level potting soils.

Ecological innovation: "Père François" peat-free potting soil

For gardeners concerned about their environmental footprint, Père François peat-free potting soil (Or Brun ) is a revolution. By replacing peat (whose extraction is regulated to protect wetlands) with renewable plant matter and noble composts, this potting soil proves that ecology can rhyme with efficiency. Suitable for use in organic farming, it's perfect for those who want a healthy vegetable garden that respects biodiversity.

Planting rule: "3 times" volume

Whatever the potting soil you choose, your plants' recovery depends on the space you give them. The recommendation Or Brun is clear: choose a pot or dig a hole approximately 3 times the volume of the current root ball.

Never forget the essential drainage layer at the bottom of the pot. For small pots, use clay balls Vilmorin. For heavier planters or outdoor beds, pozzolan is excellent, as it does not degrade over time and stabilizes the structure perfectly.

Watering: the essential finishing touch

Once you've finished repotting with your gardening tools, a generous watering is essential to bring the potting soil into contact with the roots. For optimum management, especially in summer, install a micro-irrigation system at the foot of your planters to ensure that the organic fertilizer contained in your Or Brun potting soil is distributed evenly to the roots.

Conclusion

Choosing a quality universal potting soil is the best investment you can make for your garden this March. Whether it's the algae-doped performance of the classic version or the eco-consciousness of the peat-free version, your plants will thank you with vibrant colors and renewed vigor. Grab your gloves, the season's just beginning!