Quick Reference
A lawn as an organism needs between an inch to an inch and a half of water per week — including rainfall.
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1 – 1.5" / week
Established Michigan lawn
(rainfall + irrigation)
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5am – 10am
Ideal watering window
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Never Evening
Evening watering invites fungus
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The Pizza Rule
Think of it like a pizza. By the end of the week you need to have a whole pizza — an inch to an inch and a half. It doesn't matter how you slice it. You can do two big slices (2×/week) or three medium slices (3×/week). Just get your whole pizza by Sunday.
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Joe's Personal Schedule
Half inch per watering, 3 days a week in summer (Mon/Wed/Fri). Spring and fall: 2 days a week. His system takes 36 minutes per zone to output half an inch — yours may be 22 minutes or 40 minutes. The tuna can test tells you YOUR number.
Soil Type Guide
🏖️ Sandy Soil
- Frequency
- 5 times per week
- Mist Heads
- 5 – 8 minutes per zone
- Rotary Heads
- 20 – 30 minutes per zone
🧱 Clay Soil
- Frequency
- Every other day
- Mist Heads
- 5 – 8 minutes per zone
- Rotary Heads
- 20 – 30 minutes per zone
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Drought / 90°F+ days
Add an extra watering day to the schedule above.
Seasonal Schedule (Michigan)
| Season | Frequency | Notes |
|---|
| Spring |
Normal schedule |
Soil absorbing well after thaw |
Summer
Jun – Aug |
Increase frequency |
Water 1.5× normal in heat waves |
| Fall |
Every other day |
Reduce as temps drop |
| Winter |
None |
Do not water when ground is frozen |
Deep & Infrequent — Why It Works
🌱
If you water 15 minutes every day, that's the same total output as 30 minutes every other day — but the every-other-day approach pushes water deeper into the soil. When the top inch evaporates, the roots have to stretch down to find water below. That builds deeper roots and drought tolerance. Shallow daily watering keeps roots near the surface where they're vulnerable to heat.
Signs Your Lawn Needs Water
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🌀
Grass blades curl into a V or tube shape — drought stress, water immediately
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👣
Footprints stay visible in the lawn — too dry, add a watering day
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Dark green stripe along sidewalk/driveway edge — that's what properly watered grass looks like. The concrete channels water back to that strip.
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📉
Grass looks dull or grayish-blue instead of bright green — drought stress starting
Why Morning Watering Matters
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Always water in the morning — 5am to 10am. If you water at night, that grass stays wet for 8–12 hours. The longer grass stays wet, the more fungal disease develops. Morning watering lets the sun dry the blades through the day.
Sprinkler Head Starting Points
| Head Type | Starting Point |
|---|
| Rotary heads |
25 – 30 min per zone, every other day |
| Mist heads |
10 – 15 min per zone, every other day |
| Manual / hose sprinkler |
Use tuna can test to calibrate |
🥫
These are starting points only. Run the tuna can test to get your exact number.
New Sod Watering
New Install Only
1
Week 1 — Water 2–3 times per day
Rotary: 15 min/zone · Mist: 5–8 min/zone
2
End of Week 2 — Reduce to once per day
Continue same run times per zone
3
After establishment — 3–4 times per week
Target ~1 inch per week total
✂
First mow: wait until 3.5 inches tall
Typically 14–21 days after install
☀️
During hot/dry weather, water more frequently to prevent new sod from drying out.
Application Timing
| Product Applied | Wait Before Watering | Notes |
|---|
Pre-emergent granular
Round 1 |
Water within 2–3 days |
Requires 1 inch of water to activate |
Grub prevention
Round 2, Acelepryn |
Water within 2–3 days |
Critical — must be watered in |
| Liquid herbicide |
Wait 24 hours |
Let product dry on leaf blades first |
| After ANY application |
Re-enter when dry |
~1–2 hours for liquid applications |
⚠️
Grub prevention is the #1 callback item
Always tell customers: "Water this in within 2–3 days or it won't work."
Tech Tips — Educating Your Customer
Talking points for the door or door hanger:
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"Place a tuna can or rain gauge in the lawn — when it has 1 inch of water, you're done for the week."
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"Water in the morning so the lawn has all day to dry — evening watering invites fungus."
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"Deep, infrequent watering builds deeper roots than light daily watering."
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"If grass blades curl into a V-shape, that's drought stress — water immediately."
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👣
"Footprints that stay visible in the lawn = lawn needs water."
🥫 Sprinkler Cup Test
- Place 4–6 tuna cans or rain gauges around the lawn
- Run sprinklers for 30 minutes
- Measure water collected — multiply to determine time needed for 1 inch
- Compare amounts between zones to find uneven coverage
Mowing Reference
📏
Mowing Height
3 – 3.5"
Cool season grass (Michigan)
⬆️
Best Practice
Highest Setting
Green & weed-free results
- Mow before application, or wait until product is watered in and dried
- Granular fertilizer will not be scattered by the mower
- New sod: wait until 3.5 inches tall before first mow (14–21 days)
✂️
Mowing Height Affects Water Needs
Grass cut at 3–3.5 inches shades the soil — the blades act almost like a mulch barrier, reducing evaporation and retaining soil moisture. Grass cut at 2 inches or less needs significantly more water and is more susceptible to heat stress and drought damage.