Using worm soil will improve your crops and overall garden health.
To get the most out of my worm soil, I practice crop rotation. Fresh-from-the-pile worm soil is used in early spring to plant members of the nightshade family. After these are harvested, I follow up in the same rows with a fall crop from the mustard family, without adding any additional worm soil. The following spring, I again use the same rows — and worm soil — to grow vegetables from the gourd family. I continue in this way until my using worm soil is exhausted, at which point I renew the row with fresh worm soil and begin again with the nightshade family.
The chart in the image gallery is a list of some common garden plants, arranged according to family and species. It's the family designation you want to keep in mind when planning your crop rotation. Plant this year's tomatoes where last year's peppers stood, and you're asking for disappointment; both are members of the nightshade family, and so require the same soil nutrients.