September is a busy time for anyone who tends their own plot: the mass harvest is underway, bushes are being pruned, and the soil is being prepared for winter. To keep the harvested vegetables stored longer and help perennial plants survive the cold, garden work is best coordinated with natural biorhythms. The lifestyle project Styler (RBC-Ukraine) has published a lunar sowing calendar for September 2026, breaking down day by day what can be done in the garden and what is better left for later.

Harvesting and Pruning: When the Sap Moves Down to the Roots

According to the calendar, the best time for harvesting root crops and potatoes, as well as for autumn pruning of roses and fruit trees, falls on the phases when the plant's sap moves down toward the roots. During this period, any cuts are less traumatic for the plant, so pruning goes "more easily" and heals better before winter.

Days of Rest and Sowing Green Manure

During periods of complete rest, plants become maximally vulnerable, so any work with garden shears, shovels, or hoes should be put off entirely. On the other hand, this is a great window for sowing winter crops and green manure — mustard and rye — as well as for actively feeding the soil with natural fertilizers that will have time to "work" before the cold sets in.

Key Dates for September 2026

The most favorable days, according to Styler, are September 1, 3, 12, 13, 18, 19, 21, 24, and 28: on these days, the authors claim, sown green manure will grow quickly and the harvested produce will not rot. September 4, 5, 15, 16, 22, and 23 are considered neutral — they can be devoted to routine tasks such as clearing fallen leaves and preparing compost. September 7, 10, 11, 14, and 26 are declared unfavorable, when the risk of damaging the root system is especially high.

Late Vegetables: Tomatoes and Onions

Particular attention should be paid in September to late vegetables. For green tomatoes to ripen successfully at home, and for harvested onions to keep until spring without sprouting, they should be picked exclusively during the waning Moon and in dry weather. Before storing, onions are recommended to be dried in the sun or in a well-ventilated room for several days, avoiding contact of the vegetables with moist soil.

Contradictory Data

It is important to bear in mind that lunar sowing calendars are not a single standard: different publications and astrologers group "lucky" and "forbidden" days differently, relying on their own schools of calculation, so the lists of favorable and unfavorable dates in various articles may not match. Moreover, from the standpoint of evidence-based agronomy, the influence of the Moon's phases on yield and plant growth has not been confirmed by scientific research, and the recommendations of such a calendar are advisory rather than mandatory. Thus, one view treats the September dates as a strict schedule of work, while the other sees them as a traditional guide that should be combined with agronomy and weather, not replaced by it.