In a way, the calendar hones what folklore and farmer's hunches suggest. To Wildfeuer, the world is, perhaps, more spiritual than many see it. Likewise, each plant. Root crops like radishes are earth. Leaf plants like lettuce are water.
Flowers are air.
Fruit, which requires warmth to mature, is fire. The moon charts the course. So with the moon in fiery Aries, start tomatoes. With the moon in earthy Taurus, plant radishes. Mainstream horticulture has not exactly embraced the notion.