5-8 Plots need 1/20th the water of rows – 5 min. flooding Published May 4, 2011 at 800 × 600 in Gardening Made Easy – For Moderate to Arid Climates ← Previous / Next → Plots Need 1/20th the Water of Rows Targeted watering and better water containment make for a much more efficient garden. Put a hose timer on your hose bib, and keep water from jetting out with an airater.