Lunar & cosmic calendar
Working the vineyard by the rhythm of root, leaf, flower and fruit days.
The biodynamic calendar organises vineyard work by lunar and cosmic rhythms. Each day is classed as a root, leaf, flower or fruit day, and there are ascending and descending sap phases that guide when to apply the preparations, prune, till or harvest.
It is one of the most visible — and most debated — components of biodynamics. Whatever reading one takes, in practice it works as a planning discipline that many growers associate with better tasting results. Working the calendar requires planning and recording the dates.
Effort
Low — mostly planning discipline.
Cost
Very low — it is a matter of organisation.
Time to result
Immediate as a planning method.
What it advances
Contribution by goal — click through for detail and metrics.
Wine expression & quality
It is the component growers most associate with wine expression, by aligning tastings and work with fruit days.
Time horizon: Ongoing
What to measure for this pairing
Demeter certification
Working by the calendar is part of the biodynamic practice valued and documented under Demeter.
Time horizon: Ongoing
What to measure for this pairing
Plant vitality & resilience
It guides the timing of preparation applications and green work, integrating them into a coherent rhythm.
Time horizon: Ongoing
What to measure for this pairing
How it works
It classes days by type (root/leaf/flower/fruit) and sap phase, serving as a guide for choosing when to apply preparations and carry out work.
How to apply
- 1Check the calendar for the day type and sap phase.
- 2Align preparations and work with the appropriate day.
- 3Favour fruit days for tastings and certain operations.
- 4Log the dates to evaluate over time.
What to measure
Frequently asked
Does the biodynamic calendar have a scientific basis?
The effects attributed to lunar/cosmic rhythms are debated and not scientifically settled. Many growers use it as a planning discipline and associate it with better tastings; Demeter certification values working the calendar.
Do I need to follow the calendar for everything?
In practice you prioritise applying the preparations and certain operations and tastings; weather and agronomic conditions always come first.
Related reading
How GrapeFlow helps
Plan and document this practice by plot, with an audit-ready history for Demeter certification.
Phenology & field observations
Budbreak, flowering, veraison and everyday occurrences logged by plot and date — the vineyard’s real calendar, the one any work programme is read against.
Electronic field notebook (Portugal)
In Portugal, every operation — compost, cover, animals, treatments — logged by plot, with the DGADR notebook filling itself and staying certification-ready.
Tasting notes & analyses
Per-lot tastings and analyses over time, to relate the biodynamic programme to how the wine evolves.
Free for 30 days · no credit card