In garden soil, worm activity also enhances the soils porosity, which promotes oxygenation of roots and encourages beneficial aerobic bacteria. Looser soil created by earth worm activity allows plant roots to penetrate further down into the soil to reach more nutrients and resources, which leads to stronger, vibrant, healthier and more productive plants.
Worms tunnel through the soil endlessly wandering about and chowing down on any organic matter they come across, they leave castings in their wake. The castings themselves are basically free fertilizer processed by the bowels of the worm.
Earth Worms thrive in moderately warm soils, in the vicinity of 70 degrees Fahrenheit is optimal. Temperature extremes, too cold or hot or too wet or dry are not conducive to promoting their activities. Worms in gardens are most active when soil is moderately warm and moderately moist. They are moderately moderated organisms.
Encouraging Earthworms in Soil
Tilling is necessary to a certain extent, but it does harm the earth worm population. Avoid excessively deep tilling to avoid damaging earthworm burrows.