How Ground Temperature Kills Trees
How This Scottsdale Community Saved Their Trees
A Scottsdale community was losing trees at an alarming rate. Many older trees had died, and newly planted ones were struggling. To fix the problem, Ryan from Adapted Plant Health stepped in.
The Problem: Desert Heat & Rock Landscaping
The community’s rock ground cover was reaching 140°F in the summer, holding heat all night. This extreme temperature stressed the trees, preventing healthy root growth and leading to widespread tree loss.
How Different Landscape Surfaces Handle Heat
Understanding how ground materials affect temperature helps explain why trees were struggling.
Natural Grass
Day surface temperatures typically 85–100°F when air temps reach 105–115°F. Night temperatures drop to 70–85°F, allowing soil and roots to cool and recover.
Organic Mulch Beds
Day temperatures typically 95–115°F. At night they cool to 75–90°F, moderating heat and protecting soil biology around tree roots.
Decomposed Granite / Landscape Rock
Day temperatures commonly reach 130–160°F under full sun. Night temperatures remain elevated at 95–120°F, storing heat and increasing plant stress.
Artificial Turf
Day surface temperatures often reach 140–170°F in summer conditions. Night temperatures remain around 100–130°F, continuing to radiate heat into the surrounding soil.
Key takeaway: Rock and artificial turf can be 40–70°F hotter than grass or mulch, significantly increasing root zone stress and soil temperature around nearby trees.
The Solution: Mulch
Ryan recommended replacing rock with organic mulch, which:
Keeps soil cooler during the day and allows it to cool at night
Feeds the soil and roots, improving fungal activity for healthier trees
Supports long-term growth and resilience
“Over the next couple of years, these trees will look much stronger and healthier than others in the neighborhood,” Ryan explains.
Why It Matters
Mulch doesn’t just save trees—it improves soil, reduces water loss, and creates a sustainable landscape. For desert communities, small changes like this can make a huge difference.
Adapted Plant Health helps communities evaluate landscaping and implement solutions that save money and improve tree health.
Learn more at adaptivephs.com or call 602-777-7764.
If you have any landscaping questions,
Please contact AMS Landscaping at (602) 944-0421 or go to our website at azlawns.com/contact.
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