Sonnenerde: Peat-free organic soils with genuine “Living Soil” logic
If you're looking for a substrate that isn't peat-based but rather based on compost, structural materials, and active soil life,
then Sonnenerdeis one of the most exciting options in the DACH market. Depending on the variant, you'll get a
system for seedlings, a “just water” setup, or a
Terra Preta-inspiredsubstrate with biochar and high buffering capacity.
1) Choosing the right Sonnenerde (Quick Guide)
Seedlings & Germination:Organic Seedling Soil – Sonnenerde describes it as a peat-free seedling soil,
which supports intensive root formation through its structure and components.
Complete Cycle / “Just Water”:Organic Hemp Soil – known as a “ready to grow” system,
peat-free and without coir, with active soil life. It is said to greatly simplify feeding:
just add water, avoid waterlogging.
Terra Preta Principle / Long-term Fertility:Organic Black Soil – produced with
biochar, compost, and mineral components, among others; Sonnenerde emphasizes long-term soil fertility and the
carbon storage effect.
Targeted Soil/Earth Improvement:Black Soil Concentrate – according to Sonnenerde, it can upgrade one's own soil
towards Terra Preta (e.g., incorporate or use as a mulch layer).
2) What makes Sonnenerde “different” (and why it's practical)
Peat-free approach:Sonnenerde explicitly describes several products as peat-free.
This fits sustainable setups and reduces the classic “peat standard.”
Visible biological activity:A white fungal mycelium can be normal – Sonnenerde explains this
for several soils with the slow decomposition of horn meal and high microactivity.
Buffer & Error Tolerance:For Organic Hemp Soil, the buffering capacity is mentioned, which can absorb slight
fluctuations – this is often more valuable in everyday life than “maximally complicated.”
Terra Preta Approach:In Black Soil, biochar plays a central role; Sonnenerde also describes
the carbon storage character and the special microbiology.
Source: Details on production, components, and application can also be found in the official
data sheets and certificates from Sonnenerde (see links below).
3) Watering & Handling: 6 rules that help immediately
- Avoid waterlogging:For Organic Hemp Soil, it is explicitly recommended to prevent waterlogging.
“Looks dry” can be deceiving:For Organic Seedling Soil, Sonnenerde points out that it retains water well
and the surface may appear dry faster due to wood fibers.
- Fungus gnat check:Sonnenerde recommends letting the soil dry out once before use.
- Water evenly:better to water in small stages than “flood all at once.”
- Use pot weight:Weight is often the best moisture indicator (especially for highly water-retentive substrates).
- Respect biology:don't constantly “over-correct” – stability beats haste.
4) Official Data Sheets & Certificates (Trust, E-E-A-T)
Sonnenerde provides downloads for various products (e.g., data sheet/certificates).
This is ideal if you want to look up ingredients or application cleanly:
FAQ: Sonnenerde
Is a white fungal mycelium on the soil bad?
In several Sonnenerde soils, this is described as normal: Horn meal is slowly decomposed by fungi,
and this can become visible as a white mycelium – an indication of biological activity.
Which Sonnenerde is most sensible for seedlings?
For starting, the Organic Seedling Soil is the obvious choice. However, Sonnenerde points out that after the transition to
vigorous leaf growth, it becomes too low in nutrients – then a switch to a more nutrient-rich soil is sensible.
Why is “just water” mentioned for some Sonnenerde variants?
For Organic Hemp Soil, the “ready to grow” principle is emphasized: pre-fertilized, biologically active, peat-free –
this greatly simplifies the fertilization logic. Correct watering without waterlogging remains important.
What is the difference between Black Soil and Black Soil Concentrate?
Black Soil is a finished substrate based on the Terra Preta idea. The concentrate is intended to
specifically upgrade one's own soil/substrate towards Terra Preta (e.g., incorporate or mulch).
