Seasonal strategy and maintenance

Winter and spring are your filling seasons. November through March delivers 60–70% of annual UK rainfall. Your butts should be brimming by April, ready for the long dry season ahead. This is when you stop using mains water entirely — every drop you capture now is a drop you do not pay for in July. If your system overflows repeatedly in winter, you need more storage: another butt, a second IBC, a buried tank if you have the budget and space.

Summer is drawdown season. From late May to early September, expect your reserves to halve every 10–14 days even with occasional showers. Prioritise: water seedlings and containers first (they die fastest), then soft fruit and salad crops, then established plants only if they wilt. Let your lawn go brown — it will recover. Let your roses tough it out — they have deep roots. Save the rainwater for crops that directly feed you. By late August your butts may run dry; this is normal. The autumn rains arrive in September, and the cycle begins again.

Winter maintenance is simple but essential. In November, disconnect hoses and taps; drain any low-lying pipes that might freeze. Leave butts one-quarter full — ice can expand and crack plastic, but a partial fill flexes safely. Remove and scrub lids; check for cracks, leaks or loose connectors. If a butt has accumulated a sludge layer (decomposed leaf matter), tip it out, scrub with a stiff brush and white vinegar, rinse, and refill. A well-maintained butt lasts 15–20 years. Neglected, it fails in five.