Monsoon Season Turf Care: What to Do Before and After a Henderson Storm

Henderson gets very little rain and what it gets arrives badly: monsoon cells between roughly July and September that drop an inch in twenty minutes over an area with almost no absorbent ground. That volume moving that fast is a mechanical event for a turf lawn, not a watering.

What a monsoon cell actually does

• Moves infill. Sheet flow across the lawn carries infill to the low edge. On graded lots in Anthem and MacDonald Highlands a single significant storm can visibly redistribute it.
• Carries silt in. Runoff from uphill hardscape, gravel, and open dirt arrives loaded with fine sediment and deposits it directly into your infill.
• Exposes drainage failure. A lawn that drains fine under a hose can be overwhelmed. This is when homeowners discover a base problem that has existed for years.
• Reactivates pet odor. Heavy water plus heat is the exact condition that releases ammonia from crystallised uric acid. The smell after the first big storm of the season is a reliable annual event.
• Lifts edges and opens seams. Water getting under a marginal edge can pull it up, and once an edge is lifted the wind finishes the job.

Before the season: a June checklist

1. Clear every seam and perimeter of organic debris. Debris dams water and turns sheet flow into pooling.
2. Check that edges and nails are secure. A marginal edge in June is a repair in August.
3. Check infill depth, particularly at the top of any slope. Storm flow takes the thinnest areas first.
4. Deal with pet odor before July rather than after. Treating a lawn while it is dry is easier and cheaper than treating one that has just been reactivated.
5. Look at where water enters your yard. A downspout or a neighbour’s hardscape discharging onto your turf is the root cause of most repeated silt problems, and it is usually fixable with a splash block.

After a significant storm

1. Wait for it to drain, then check for spots still holding water after an hour. That is your drainage problem, and it is now visible.
2. Look for infill piled at the downhill edge and thin patches uphill. Redistribution should happen before the next cell, not at the end of the season.
3. Walk the perimeter for lifted edges and opened seams. Small now, expensive later.
4. Check for silt deposits, which read as a grey or tan film across the lawn. Extract it before it works down into the infill.
5. Smell the pet zones. Post-storm ammonia is normal and it means the crystals are still there, not that the treatment failed.

Where this bites hardest in Henderson