Deep Watering Demystified: Sprinkler Timing, Clay Soil, and Mulch

What "Water Deeply" Means

1.5–2 inches per week, delivered in 2 sessions (not daily). For sprinklers: 12–15 min twice/week, but measure with rain gauge—sprinklers vary wildly.

Clay Soil Specifics (Oregon)

• Clay holds water but drains slowly → root rot risk.
• Amend with compost/manure annually to improve structure.
• Raised beds (12" deep, cedar frames) eliminate clay issues.

Mulch Is Non-Negotiable

• Shredded leaves/bark 3–4".
• Cools soil, retains moisture, feeds microbes.
• Reduces watering 30–50%.

Timing Rules

• Early morning (5–9 AM): deep penetration, low evaporation.
• Never evening (wet leaves = fungus).
• Midday only for emergency cooling.

Recovery from Daily Watering

Mulch now. Fall: build raised beds, double-dig compost. Each year improves.