Black truffle & summer truffle
Tuber melanosporum & Tuber aestivum
You don't grow the truffle, you plant the tree that bears it: an oak or a hazel whose roots have been married to the fungus in the nursery. A patience of several years, on chalky soil.
Full sun
Chalky, well-drained
Role in permaculture
A perennial agroforestry crop on poor, dry chalky lands, often unsuitable for other production: truffle trees structure the landscape and turn marginal soils to account over the very long term.
Growing this mushroom
- Method
- Certified mycorrhized host trees (inoculated truffle growing)
- Substrate
- The soil itself, via the tree: chalky, well-drained, aerated, poor in organic matter, with a basic reaction (pH of about 7.5 to 8.5). The summer truffle (Tuber aestivum) tolerates a wider range of soils and a cooler climate than the black truffle (Tuber melanosporum), more strictly Mediterranean.
- Where to place it
- Documented host trees: holm oak (Quercus ilex), downy oak (Quercus pubescens), hazel (Corylus avellana), also hornbeam and lime depending on the species. Full sun, filtering chalky soil; in a Mediterranean to dry-continental climate for the black truffle, a little further north for the summer truffle.
- Period
- Planting in autumn or late winter. Harvest: black truffle from December to March; summer truffle from May-June to September.
- Level
- Advanced (a long-term project)
Steps
- Obtain certified young mycorrhized trees, in France, INRAE / CTIFL certification attests that mycorrhization by the right Tuber species has been checked under the microscope.
- Plant in well-drained chalky soil, in full sun, with wide spacing for aeration; avoid heavy, waterlogged soils.
- Maintain: light surface tillage, moderate summer watering in dry years, control of competing herbaceous plants, monitoring of the 'brûlé' (the ring where grass disappears, a sign the mycelium is at work).
- Harvest with a dog or a truffle fly once production is established. Note: it's long and uncertain, often on the order of 6 to 10 years before the first truffles, with no guarantee of regularity.
Precautions
At harvest, rule out the confusions: 'deer truffles' (Elaphomyces) are not edible; the black truffle can be confused with Tuber brumale (less fragrant) and, on the market, with the Chinese truffle (Tuber indicum), a source of fraud. Reliable identification goes through the smell, the cut (flesh and veins), and the use of a truffle dog.
Sources: Fédération Française des Trufficulteurs (FFT), fft-truffes.fr, principe, arbres-hôtes, entretien · INRAE / CTIFL, certification des plants truffiers mycorhizés · MycoDB, fiches Tuber melanosporum et Tuber aestivum
Good companions
Traditional companion planting (benefit not demonstrated)
Nutritional & medicinal properties
For educational purposes. Not a substitute for medical advice. Effects depend on the form, the dose and personal context.
Precautions & contraindications
Do not eat a 'deer truffle' (Elaphomyces): to recognise a true truffle and avoid fraud, see the cultivation section.
Species & varieties
The best-known species and varieties in France.
Species
Key takeaways
- • Prefers full sun exposure.
- • Ideal soil: chalky, well-drained.
- • Classic companion: Hazel.