Greenhouse Watering: Methods, Timing, and Automation

Watering is the greenhouse’s most critical daily task. Done wrong, crops fail. Done right, it’s efficient and rewarding.

When to Water

• Evening preferred—less evaporation, foliage dries before night.
• Soilless mixes dry faster; monitor closely.
• Water by need, not calendar. Mature plants drink more; seedlings need mist.
• Reduce in dormant months (Dec–Jan).
• Wet floors on hot days to raise humidity.

Methods

• Hand-watering – Finger-test or moisture probes; break stream with cloth for gentle flow.
• Overhead spray tubes – One- or two-sided; suspend from roof.
• Capillary mats + gutter reservoir – Low-cost sub-irrigation.
• Drip/mist kits – Adjustable valves, timer-ready.

Automation

Timers or sensor controllers free you for work or travel. “Gardeners are always optimistic… never satisfied.” —Vita Sackville-West