Moon Phase Gardening Calendar: Planting by the Moon
This moon phase gardening calendar explains the old farming tradition of planting by the moon, tied to whether the moon is waxing (growing brighter) or waning (growing dimmer). It's still followed by plenty of home gardeners today. Here's what the tradition actually says, and how honest we can be about whether it does anything.
The basic rule: waxing vs. waning
Waxing moon (new moon to full moon): plant annual flowers and vegetables that produce their harvest above ground, like corn, tomatoes, watermelon, and zucchini. The traditional reasoning is that increasing moonlight each night encourages plants to put their energy into leaves and stems.
Waning moon (full moon to new moon): plant root vegetables, bulbs, and perennial or biennial flowers, like carrots, onions, and potatoes. The tradition holds that as moonlight decreases, plant energy shifts downward into root and tuber development.
Where this idea comes from
The tradition rests on two claimed mechanisms: that the moon's gravitational pull affects soil moisture the same way it affects ocean tides (so seeds are said to absorb more water during the waxing phase), and that the lunar cycle influences the direction a plant puts its growth energy. Some traditions break this down further into all four lunar quarters rather than just waxing and waning, but the core above/below-ground split is the version most home gardeners use.
Does it actually work?
Being direct about this: there's no widely accepted, controlled scientific study confirming that moon-phase timing changes garden yields. Soil quality, sunlight, water, and timing relative to your local frost dates matter far more than which lunar quarter you planted in. That said, it's a long-running tradition that plenty of gardeners still enjoy following, and there's no real downside to timing routine planting around it if you find it a useful structure -- just don't expect it to override the fundamentals.
Using this with a moon phase calendar
If you want to plan around this tradition, check the Moon Phase Calendar tool for any month to see which days fall in the waxing or waning half of the cycle before you plant.
The planting rules above reflect the version of this tradition most commonly published by gardening almanacs, not a scientifically validated agricultural practice. We haven't found controlled-study evidence either confirming or fully debunking a yield effect, and say so plainly rather than overstating either direction.
Sources: The Old Farmer's Almanac, Planting by the Moon Phase, Farmers' Almanac, Why Do We Garden By The Moon?.