How long should I run sprinklers for deep watering?
Written by
Paul Reynolds
Reviewed by
Prof. Martin Thorne, Ph.D.Appropriate sprinkler timing promotes deep, healthy roots while conserving water. Run your sprinklers in each zone for about 15-20 minutes to provide sufficient water to the critical depth of 6-8 inches, where most roots are feeding. This will reduce shallow growth that makes plants susceptible to drought. My lawn completely changed after I learned this process.
Soil Composition Effects
- Sandy soils need 10-minute cycles repeated every hour
- Clay requires slow 25-minute soaks to prevent runoff
- Loam absorbs best with 15-minute steady applications
Plant Root Depth Requirements
- Lawns need 6-inch penetration for healthy turf
- Vegetables require 8-10 inches for optimal yield
- Shrubs thrive with 12-inch deep watering monthly
Use the screwdriver penetration test measurement. Insert the screwdriver 30 minutes after watering. Follow the depth of resistance to show true absorption. My measurement showed I was watering too shallow. Adjust weekly based on the weather. Add 5 minutes during 90°F heating. Take half the time back when rainfall exceeds 0.5 inches.
Incorporate soaker hoses for little wasted water and no overhead watering. They are very inefficient at getting water to the roots. Soaker hoses use 90% less water than sprinklers. Place them through the beds, designing soaker tubes that are spaced every 12 inches apart. Run the soaker for 45 minutes to get intense saturation. You will save on your water bill and get healthier plants.
Time for early morning watering sessions. The ideal times are 4-5 AM when winds and evaporation are minimized. Use programmable timers to help with consistency. Check sprinkler coverage at least once a month to ensure optimal performance. You want to have overlapping patterns to avoid dry spots. My garden's consistent growth and foliage show that coverage is just as important as time.
Regularly maintain your sprinklers. Clean clogged heads every month. Measure output by placing a few tuna cans around the zone. Adjust heads until all cans have collected equal amounts of water. Regular maintenance is crucial for ensuring each plant receives its fair share of water. Healthy gardens are all about the precise distribution of water.
Read the full article: 10 Essential Tips: When to Water Plants
