This tool is a free "planting by moon phase" calendar that helps you schedule sowing within the appropriate lunar phase windows. It divides the moon's cycle into four planting windows: new moon to first quarter for leafy greens, first quarter to full moon for fruiting crops, full moon to last quarter for roots and bulbs, and last quarter to the next new moon for rest. Each day is colored according to the window, and it shows the constellation the moon is in at noon that day. A constellation followed by F indicates a fertile constellation, traditionally considered suitable for sowing and transplanting.
In terms of main capabilities, with JavaScript enabled, it generates a full-month calendar for your time zone, marks each day's window and moon constellation, and gives your next sowing window by crop type. You can select the crop you want to plant, dim the other windows, and highlight the best days—those that fall both within your selected crop's window and in a fertile constellation. It also supports downloading a full year of windows for a crop type to your calendar app, or printing the current month as a moon gardening calendar.
In terms of usage, the page lists four moon windows and fertile/barren constellations. Fertile constellations are used for sowing and transplanting and include Cancer, Scorpio, Pisces, Taurus, Capricorn, and Libra; barren constellations are used for weeding, pest control, and harvesting and include Aries, Gemini, Leo, Virgo, Sagittarius, and Aquarius. The calendar uses the tropical zodiac as printed in almanacs. Biodynamic calendars use sidereal constellations, so their root, leaf, flower, and fruit days fall on different dates, and this calendar does not calculate those.
In terms of use cases, it is suitable for gardeners who follow traditional moon-phase planting methods, choosing sowing days within the limits allowed by weather and soil conditions. Sowing must be coordinated with the weather and cannot go against it: first determine whether sowing is possible based on your last frost date and the soil temperature the crop requires, then let the moon choose days within that time range. Southern Hemisphere gardeners use the same moon phases, but the months are flipped.
In terms of limitations, this calendar does not calculate the biodynamic calendar. No further details are provided about the reminders to prioritize frost and soil, or about gardening knowledge beyond moon phases; pricing, platform, results, and similar details are not provided.
