Vermicast (worm castings) – Use in Hot Summer Months

Vermicast are excellent to use in the hot summer months—but with a few considerations to maximize their benefits:

Why Worm Castings Work Well in Summer

• Won’t burn plants – Unlike synthetic fertilizers, castings are gentle and safe, even in heat.
• Improves moisture retention – Castings help soil hold water longer, which is crucial in hot weather.
• Boosts microbial activity – Even in high temperatures, the biology in castings can help support plant resilience and soil structure.
• Supports stressed plants – Summer heat stresses plants; worm castings provide a steady, natural source of nutrients to help recovery and growth.

Tips for Summer Application:

• Apply early morning or late afternoon to avoid evaporation loss.
• Mulch after application – Top with straw, leaves, or wood chips to protect microbes and retain moisture.
• Water in after use – Helps activate nutrients and move microbes into the root zone.
• Use as a top dressing or mix into soil lightly – Avoid deep digging during hot months to prevent root stress.

Good Summer Uses:

• Around tomatoes, peppers, melons, cucumbers, corn, squash, herbs, flowers, and young trees.
• In containers and raised beds where soil can dry and heat up fast.
• As part of a compost tea to water plants and boost their immunity.