Red Wiggler Worms for Composting: A Beginner's Guide

Red wigglers (Eisenia fetida) are best known to our customers as fish and amphibian feeders — but they're also the world's premier composting worm, converting kitchen scraps into worm castings, one of the richest natural fertilizers there is.

The bin

Any opaque plastic container around 40–60L works: drill small drainage holes in the base, air holes near the top, and sit it on a tray. Keep it in shade — a garage, under a sink, or a shaded stoep. Worms work best between 15–25°C; Highveld summers mean shade is non-negotiable and winter means keeping the bin off cold concrete.

Bedding

Fill two-thirds with moist bedding: shredded newspaper and cardboard, coco peat, or a mix. Wrung-out-sponge damp is the target — dripping wet drowns worms, dry bedding kills them. Add a handful of soil for grit, then introduce your worms and give them a few days to settle before heavy feeding.

What to feed (and what never to)

Yes: fruit and veg scraps, coffee grounds and filters, tea leaves, crushed eggshells, aged garden waste. No: meat, dairy, oily food (rot and pests), citrus and onion in quantity (too acidic), and anything salty. Bury food under the bedding surface in a different corner each time, and only add more once the last feeding is mostly gone — overfeeding is the number one beginner mistake and the cause of smelly bins.

A healthy bin has no smell

Earthy is correct; sour or rotten means too much food or too much moisture. Fix by stopping feeding, adding dry shredded paper, and fluffing the bedding for air.

Harvesting castings

After 3–6 months the bedding transforms into dark, crumbly castings. Push everything to one side, add fresh bedding and food to the other, and within a couple of weeks the worms migrate over — scoop the finished castings from the vacated side. Use them as a top dressing, in potting mix, or brewed into a compost tea. (Want the benefits without the wait? We sell ready-made worm castings fertilizer too, alongside our insect frass fertilizer.)

Population

Wigglers self-regulate to the space and food available, roughly doubling every few months in good conditions. Surplus worms feed fish, frogs, newts and chickens — or seed a second bin.

Ready to start? Live red wigglers ship nationwide in counts from 50 to 1,000.