Birch
Betula pendula
Botanical family: Betulaceae
Betula pendula, the tree with white bark and light foliage that trembles in the wind. First to settle on bare ground, it opens the way to the forest.
Full sun
All soils, even poor, sandy, or acid
Self-sufficient once established
Very hardy (-30 °C)
Overwinters in your zone
Wind-pollinated (catkins, spring flowering)
Role in permaculture
A pioneer tree par excellence: it colonises bare ground, lightens and improves the soil under its light crown (which lets the light through), feeds an exceptional insect fauna, and gives in spring a sweet sap to drink or to ferment. The nurse that prepares the establishment of the forest garden.
Companions
No companion planting is documented for this plant: no recommended neighbour, no neighbour to avoid.
Seasons & availability
Sap tapped from the trunk in late winter, in February and March, a traditional spring tonic drink; young leaves picked in spring for infusions.
Available: February, March, April, May.
Guidance for the oceanic / temperate climate; it may vary with your region, altitude, exposure and growing method.
Sources
- Plants For A Future, « Betula pendula » (pfaf.org/user/Plant.aspx?LatinName=Betula+pendula)
- Plantes & Santé, « La sève de bouleau en self-service ! » (plantes-et-sante.fr/articles/zero-dechet/4930-la-seve-de-bouleau-en-self-service)
Nutritional & medicinal properties
For educational purposes. Not a substitute for medical advice. Effects depend on the form, the dose and personal context.
Precautions & contraindications
Birch pollen is strongly allergenic (hay fever, cross-allergy with apple); diuretic use is not advised in cases of kidney or heart failure without medical advice.
Species & varieties
The best-known species and varieties in France.
Species
Keep in mind
Its pollen, released abundantly in March-April, is strongly allergenic (classed 'high' by the RNSA): to be avoided in close planting near dwellings, especially in town. A tree of light and of short life, it is naturally relayed by the species of the mature forest, that's its pioneer role.
A note on rigour: many companion pairings are gardening folklore; this note sums up what the sources say, where there are any.
Before you forage
This plant is often gathered from the wild. Only pick what is abundant, never a protected species, and never uproot a whole plant (roots) without the landowner's permission. Rules vary by country and region, check locally.
Key takeaways
- • Prefers full sun exposure.
- • Ideal soil: all soils, even poor, sandy, or acid.