Gardening by the moon in 2027: what works, and your planting dates

Gardening by the moon means timing your sowing, planting, pruning and harvesting to the lunar cycle. The traditional rule is simple: sow crops that grow above ground while the Moon is waxing, from new moon to full moon, and root crops while it is waning, from full moon back to new. Good research has not found that the Moon changes how your plants grow, but the calendar can still give your garden a useful rhythm, and in 2027 that rhythm starts with the new moon of January 7.

This article covers where the practice comes from, how the biodynamic version works, what studies have actually found, and the 2027 planting windows month by month for gardens in both hemispheres.

What does gardening by the moon mean?

Farmers have watched the Moon for as long as they have worked the land. Roman writers such as Pliny the Elder already gave moon advice for farm work, and almanacs carried the habit into the modern age. The Old Farmer’s Almanac still prints the classic version, which splits the month in two.

• Waxing moon (new to full): sow and plant annual flowers and crops that you harvest above ground, such as lettuce, spinach, cabbage, beans, corn, tomatoes and squash.
• Waning moon (full to new): plant root crops, bulbs, biennials and perennials, such as carrots, beets, onions, potatoes and spring-flowering bulbs.

Other moon calendars go further and time pruning, weeding and harvesting by the phase as well.

The reasoning handed down with the rule borrows from the sea. If the Moon can lift oceans, the story goes, it must pull moisture upward in the soil while it waxes, so seeds swell and sprout, and let it sink toward the roots while it wanes. Increasing moonlight is said to encourage leaves and stems, and fading moonlight roots and tubers.

How does the biodynamic moon calendar work?

In the 20th century the idea grew a far more detailed branch. Biodynamic farming began with eight lectures that Rudolf Steiner gave at Koberwitz, then in Germany and now Kobierzyce in Poland, in 1924. Later practitioners built sowing calendars on it, and the best known came from the German author Maria Thun (1922 to 2012).

A biodynamic calendar looks less at the phase and more at the zodiac constellation the Moon is passing in front of. The Moon passes all twelve zodiac constellations in a sidereal month of 27.32 days, so the type of day changes every two or three days. Each day is assigned to one part of the plant:

1. Root days for carrots, beets, radishes, potatoes and onions.
2. Leaf days for lettuce, spinach, cabbage and leafy herbs.
3. Flower days for broccoli, cauliflower and flowers.
4. Fruit days for tomatoes, beans, peas, squash and fruit trees.

Mainstream science describes this part of biodynamics as astrological. Many growers follow it anyway because it gives every task in the garden a set day.

Does planting by the moon actually work?

The most thorough look at the question came from a team at the University of Valencia, who in 2020 published a review in the journal Agronomy of more than 100 publications, from agronomy and plant physiology textbooks to research papers dating back to 1946. They found no reliable, science-based evidence for any link between lunar phases and plant physiology that would justify moon-timed farming, and they concluded that physics does not support one either.

The physics is easy to picture. Tides happen because the Moon pulls a little harder on the near side of the Earth than on the far side, and across an ocean basin thousands of kilometers wide that difference moves enormous amounts of water. Across a seed tray or a vegetable bed the difference is vanishingly small, far smaller than the effect of a watering can or a warm afternoon. You can read more about how tides really work in full moon tides and spring tides.

There are a few intriguing laboratory findings, and they deserve a fair hearing:

• Root growth rhythms. Peter Barlow and Joachim Fisahn reviewed experiments in which the growth rate of thale cress roots kept in constant light appeared to rise and fall in step with the lunisolar tide. In their own words, the evidence for a lunar influence on root growth, or on any plant system, is correlative and therefore circumstantial.
• Moonlight. A 2025 study in Plant, Cell and Environment exposed Indian mustard plants to three nights of full moonlight or darkness and found lasting changes in their proteins and metabolites, along with enhanced growth. The authors called for more research. It is one lab study, and it tested light, not sowing dates.

That second point shows why sowing dates are hard to connect to moonlight. Full moonlight at ground level is only about 0.1 to 0.3 lux (more in how bright is moonlight), and any seedling that lives longer than a month sees a full moon whichever week you sowed it.

The value of a moon calendar is not in the moonbeams but in the gardener: it brings you back to your beds every two weeks, and attention is what plants respond to.

Why do so many gardeners still swear by it?

Because something real does happen, just not in the sky. A moon calendar turns vague intentions into dates. Instead of sowing everything on the first warm weekend, you sow in two-week waves, which spreads your harvest and spreads the risk of a cold snap. You walk the garden more often, so you notice aphids, dry soil and bolting lettuce sooner. Many people keep notes, and a garden with a notebook improves year after year.

If you are curious, test it yourself in 2027. Sow half a row of the same seed in a waxing window and the other half two weeks later in a waning window, keep everything else the same, and write down germination and harvest. Repeat it in a few months. It will not settle the science, but you will learn more about your own soil than any calendar can tell you.

Gardening by the moon 2027: month by month

The windows below come straight from the new and full moons of 2027. Waxing windows run from a new moon to the next full moon, waning windows from a full moon to the next new moon. A date can shift by a day in your time zone (the April 6 new moon, for example, is April 7 in the UK, India and Australia), so check the local times on the new moon calendar and the full moon calendar. The seasonal notes are broad strokes for temperate gardens; in the tropics and monsoon regions, follow your wet and dry seasons instead.

Month	Waxing: above-ground crops	Waning: roots, bulbs, perennials	Northern gardens	Southern gardens
January	Jan 7 to 22	Jan 22 to Feb 6	Plan, prune dormant fruit trees	Harvest, quick summer salads
February	Feb 6 to 20	Feb 20 to Mar 8	Early sowings indoors	Sow autumn brassicas
March	Mar 8 to 22	Mar 22 to Apr 6	Sow under cover, early potatoes	Autumn: harvest and store
April	Apr 6 to 20	Apr 20 to May 6	Peas, salads, onions	Garlic and spring bulbs
May	May 6 to 20	May 20 to Jun 4	Plant out after last frost	Broad beans, clear beds
June	Jun 4 to 19	Jun 19 to Jul 4	Succession sowing	Winter: bare-root trees
July	Jul 4 to 18	Jul 18 to Aug 2	Harvest, sow autumn greens	Prune, plan spring
August	Aug 2 to 17, Aug 31 to Sep 15	Aug 17 to 31	Harvest, sow winter salads	Seeds indoors, seed potatoes
September	Sep 30 to Oct 15	Sep 15 to 30	Harvest and store, spring bulbs	Spring sowings outdoors
October	Oct 29 to Nov 14	Oct 15 to 29	Plant garlic, mulch	Tomatoes after frost risk
November	Nov 28 to Dec 13	Nov 14 to 28	Bare-root trees, rest beds	Beans, corn, squash
December	From Dec 27	Dec 13 to 27	Plan next year	Summer harvest, succession sowing

Two full moons stand out for harvest. In the northern hemisphere it is the Harvest Moon of September 15 (September 16 in the UK, India and Australia), followed by the Hunter’s Moon of October 15. South of the equator the full moon of March 22 plays that role. To keep the windows in view, hang the printable moon calendar 2027 in your shed, or add the full moons to your phone with the calendar subscription. Then sow on the dates that suit you, and let the weather have the final say.