According to almanac tradition, herbs are leaf crops, and the traditional window for planting them is the first quarter of the Moon, from new moon to first quarter. Narrowed by Moon sign, the 2027 windows fall on April 8-9 and 12-13, May 6 and 9-10, June 6-7, and September 2-5 and 30. This is the old practice of planting by the moon, and no effect on plants has been proven.
What the tradition says about planting herbs
The almanac rule
Gardening almanacs sort crops by where the useful part grows. Leafy crops and crops whose seed sits outside the fruit make up the “leaf” type, and herbs go in that group. The almanac rule is that leaf crops are planted in the first quarter, the stretch from new moon to first quarter. Lettuce, spinach, cabbage, broccoli and celery are the examples the almanacs give for the same type.
The whole phase cycle lasts 29.53 days, and the tradition cuts it into four quarters. Each quarter is assigned a kind of crop, and the fourth is set aside for rest.
| Tradition type | Quarter | Crops the almanacs assign |
|---|---|---|
| Leaf (herbs are here) | First quarter, new moon to first quarter | Leafy crops and crops whose seed is outside the fruit |
| Fruit | Second quarter, first quarter to full moon | Above-ground crops with seed inside the fruit, such as tomatoes, peppers, beans, squash and corn |
| Root | Third quarter, full moon to last quarter | Root crops, bulbs and perennials, such as potatoes, carrots, garlic, onions and beets |
The fourth quarter, from last quarter to new moon, is the almanac’s rest period: weeding, pruning, turning the soil and composting. If you want the phase rule on its own, planting in a waxing moon covers it.
What the Moon can and cannot do
No effect of the Moon on herbs has been proven. The Moon’s tidal pull at the Earth’s surface peaks at about 1.1 millionths of a meter per second squared, roughly one ten-millionth of gravity. That is far too small to move anything as light as a seed or a root. The custom stays on this page as a tradition, and some gardeners like following it.
The sign layer works differently. The Moon makes one orbit against the stars in 27.32 days and passes through the zodiac signs on the way. This convention labels Cancer, Scorpio and Pisces fruitful, Taurus, Libra and Capricorn semi-fruitful, and the other six barren. The windows below combine the quarter rule with a fruitful or semi-fruitful sign.
Traditional herbs planting days, 2026 and 2027
Windows by month
Each row lists the days when the first quarter overlaps a fruitful or semi-fruitful sign, with the Moon’s sign beside them. Every window listed falls in 2027.
| Month | Traditional Days for herbs (Moon sign) |
|---|---|
| April 2027 | April 8-9 (Moon in Taurus), April 12-13 (Moon in Cancer) |
| May 2027 | May 6 (Moon in Taurus), May 9-10 (Moon in Cancer) |
| June 2027 | June 6-7 (Moon in Cancer) |
| September 2027 | September 2-5 (Moon in Libra/Scorpio), September 30 (Moon in Libra) |
How to read the edges
The months above are the ones when gardeners in much of the country plant herbs. That list is an approximation used to choose the rows, and your own state may start earlier or later. Only the rows that fall inside your state’s planting window count for you.
Days are read at noon Eastern time (ET), and the Moon changes sign during the day. Treat the first and last day of each run as soft edges. A run such as September 2-5 shows the Moon in Libra and then in Scorpio, so the sign you see depends on the hour you plant.
Time zones shift the picture a little. Someone in the Pacific time zone is three hours behind ET, so a sign change that lands in the afternoon on the East Coast can fall around midday for them. On a day at the edge of a run, that difference is enough to move you from one sign to the other.
Check your state first: when to plant herbs where you live
The order of decisions matters. Start with your state’s planting calendar for herbs. Frost dates and soil temperature decide whether a crop can go in the ground at all, and the Moon, if you choose to follow it, only picks among the days that are already open to you. It never overrides the calendar of the place where you garden.
Our guide to when to plant herbs where you live is the place for that first step. It owns the practical dates, which this page deliberately leaves out. The table above is a layer you can add afterward, not a substitute.
Gardeners in different states reach different answers, which is why we keep the practical advice in state pages. Our state guides list every state, and a page such as the Ohio planting calendar for herbs shows what a state-level calendar looks like. Find your own state, note the window it gives, and then look at the table in this article.
If a traditional day falls outside your state’s window, skip it. If it falls inside, you have a choice between a few days, and the Moon only helps you pick one if you want a reason to. Nothing here promises a result either way.
A fair way to try it
Plenty of gardeners follow the Moon out of habit, and others are curious but skeptical. A home trial is the only way to judge the custom for your own plot, and it takes very little extra effort.
- Split one planting in two. Put half in on a traditional day from the table, and the other half on an ordinary day within the same week, in the same bed or a matching one.
- Label both halves clearly, with the date and the Moon sign if you want it recorded. Plant labels or a sketch of the bed will do.
- Keep notes on when seedlings appear and what the harvest looks like. A line or two per visit is enough.
- Compare the notes at the end of the season, and repeat the split the next year if you are still curious.
One season will not settle anything. Weather, soil and the plant’s own variation can swamp any difference between the two halves. Several seasons of notes give you a clearer picture, but even then the result applies to your plot and nobody else’s.
Questions about planting herbs by the moon
Does the tradition say to plant herbs in a waxing or a waning moon?
The almanac rule points to a waxing moon, and specifically the first quarter, from new moon to first quarter. Waning phases belong to root crops in the third quarter and to rest tasks in the fourth.
What if a traditional day falls on a frost?
The state calendar wins. The Moon never overrides frost dates or soil temperature, so a traditional day that falls in the wrong conditions simply stays unused. Your state’s planting guide tells you which conditions apply where you live.
Do I need to follow the Moon sign as well?
Only if you want the stricter version of the tradition. The windows in the table combine the quarter rule with a fruitful or semi-fruitful sign, which is a common convention of moon-sign almanacs. Biodynamic gardening in the Maria Thun tradition uses a different grid and calls Cancer, Scorpio and Pisces leaf days. Following the quarter alone is the simpler route, and neither version has been shown to change what a plant does.