How to Make Organic Compost at Home: A 30-Day Monitoring Framework

In short: Home composting means mixing “greens” (vegetable scraps, fruit peel, fresh grass) with “browns” (dry leaves, straw, sawdust) at roughly 1:2–1:3, keeping the pile as moist as a wrung-out sponge and turning it every 1–2 weeks. A microbial starter speeds things up. Compost is mature after about 1–3 months, when it is crumbly, dark, smells earthy and no longer heats up.

What to add and what to avoid

Add	Avoid
Greens: vegetable scraps, fruit peel, tea and coffee grounds, fresh grass	Meat, fish, bones, oil (smell, rodents)
Browns: dry leaves, straw, uncoloured paper, untreated sawdust	Diseased plants, seeding weeds, pet faeces, plastic, metal

Building the pile

1. Site: a ventilated bin, pit or mesh frame in shade, protected from direct rain.
2. Layers: 10–15 cm browns, then 5–10 cm greens, alternating; sprinkle starter between layers.
3. Moisture: a squeezed handful should feel damp but not drip.
4. Cover: tarp or banana leaves to keep in moisture and heat.

The first 30 days

Days	Normal signs	What to do
1–7	Pile warms up clearly	Check moisture
8–14	Hot, material settles	First turn; add water if dry
15–21	Cooling, softer, darker	Second turn
22–30	Slightly warm, little smell	Turn and leave to finish

Troubleshooting

• Smelly, slimy: too wet or too many greens → add browns and turn.
• Not heating: too dry or too few greens → add water and fresh material.
• Flies: finish each addition with a layer of browns.

FAQ

How long until it is ready?

Usually 1–3 months. Mature compost is crumbly, dark, earthy and the original materials are no longer recognisable.

Is immature compost a problem?

It can harm roots and germination. Let it finish before use.

References: US EPA – Composting at Home.

Further reading

• Fermented fish liquid fertilizer
• Fermented banana peel liquid
• Organic mint: the three-pillar model