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November 15, 2022 2 min read

Worm Castings Application Rates and Instructions 

Important: Keep castings moist until ready to use by misting lightly with water.  This keeps the beneficial microbes alive and happy! 

TYPE OF PLANT OR AREA 

NEW PLANTING 

ESTABLISHED PLANTS 

ONGOING CARE

Garden  

Vegetables,  

Annuals, and  

Perennials

Place ½ -1 cup worm castings in the planting hole and mix with soil when the plant is set out.

Work 1-2 cups worm  

castings into the top 2 to 3  inches of soil around each plant. Water well.

Side dress plants during 

the growing season at a rate of ½ cup per plant or 1 cup per linear foot of row once every 2  months.

Raised Bed 

Vegetables, 

Annuals, and  

Perennials

Mix 1 part worm castings with 3 parts soil as a  

planting medium. Add plants and water well.

Work ½ cup worm castings into the top 2-3 inches of soil around each plant and water well.

Side dress each plant with ¼ cup worm castings each month during the growing season. Work into top few inches of soil & water well.

Planters 

and 

Potted Plants

Mix 1 part worm castings with 4 parts soil as a  

planting medium. Add plants and water well.

Work 1-2 inches of worm castings into the top few inches of soil. Water well.

Side dress each plant with 2-3  Tbsp of worm castings every  2-3 months. Work into the top few inches of soil. Water well.

Trees 

Shrubs 

Berry Bushes

Mix 1 part worm castings to 3 parts soil. Place plant in hole and water well.

Apply 2 lbs worm castings  per inch of trunk diameter.  Work evenly into the soil  

around the root area. Water well.

Apply 1-2 lbs worm castings per inch of trunk diameter around the drip edge of the plant. Work into the soil. Apply in early spring and fall.

Lawns

Apply 20-30 pounds of worm castings per 1000  square feet. Work lightly into the top of the lawn and  water well.

Apply 15-20 pounds per  1000 square feet as a top dressing.

Top dress lawns at the rate of  10-15 pounds per 1000 square feet in early spring and  

fall. Water well.

Amending Garden  Soil

Apply 1-2 inches of worm castings on the garden area, then work gently into the soil. Moisten well. 

Compost Piles 

Spread a thin layer of castings between each new layer of material to be composted.  Moisten well. 

Germinating or  Sowing Seeds

In Garden Beds: 

Line planting row with ½ -1 inch worm castings and mix with soil. Place seeds in-furrow, cover with soil and water well.

In Seed Trays or Planting, Pots: 

Use 1 part worm castings to 4 parts seed starting mix. Place seeds, cover with soil, and keep moist.


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