Vermicompost, Worm Castings

Yes, our vermicompost is analyzed every 6 months; see the product page.

We offer vermicompost in bags for home gardeners and in 551 lb (250 kg) or 1,102 lb (500 kg) bulk bags for larger needs. Bulk bags can be ordered directly on our website.

Good to know: vermicompost is a living product, so its moisture content varies. It's packed down in the bag and loosens up as you use it; a 5.3-gallon (20-liter) bag weighs about 14.3 lb (6.5 kg). You can also pick it up at our depot in Lons, open Monday through Thursday.

Vermicompost is concentrated, so a little goes a long way:

• repotting: 30% mixed with potting soil or garden soil (25% for houseplants);
• seed starting: 1/3 vermicompost to 2/3 seed-starting mix, or pure as a thin top layer;
• vegetable garden and lawn: 1.6 oz per sq ft (500 g/m²) for maintenance or before sowing;
• flower beds: about 1 oz per sq ft (300 g/m²), twice a year;
• trees and shrubs: 3.3–6.6 lb (1.5–3 kg) per planting hole;
• potting mix for acid-loving plants: add 15%.

The simplest method is top-dressing: sift a 0.4–0.8 in (1–2 cm) layer of vermicompost over the top of the pot. Each time you water, the nutrients gradually work their way down to the roots over several weeks. You can repeat this about once a month, depending on your plants.

When repotting, mix 30% vermicompost into the potting soil. Spring is the ideal time to give your plants a boost; in the fall, it's better to let them rest before winter. Since it's odorless, vermicompost is perfect for houseplants.

Keep vermicompost in its bag or in a closed but not airtight container, in a cool, dry place, protected from rain and sun. It needs to breathe a little: it contains living microorganisms that need some air.

Stored properly, our vermicompost keeps for a long time, up to 2 years according to our guide. If it has dried out a bit or formed clumps, simply crumble it by hand before using it.