| Most at risk | Anything planted in the last 12 months |
| Check soil | Daily during active heat advisories |
| Best watering time | Early morning, deep and slow |
| Fertilize now? | No — wait until the heat breaks |
A Heat Dome Is Sitting Over Most of the Country Right Now
The National Weather Service has been warning since this weekend that dangerous, record-setting heat is expanding across the eastern two-thirds of the U.S., with heat indices reaching 100–110°F in places like Ohio, North Carolina, and Washington, D.C. That's landing on top of a summer where nearly every U.S. state is already showing some level of drought, according to the University of Nebraska-Lincoln's drought monitor.
Why New Plants Are at Risk
A tree or shrub that's been in the ground for a season or more has had time to push roots out beyond its original root ball. A plant that went into the ground this spring hasn't done that yet — its entire root system may still be confined to roughly the size of the pot it came in.
The Critical Window
The next several days, while the heat dome sits over the central and eastern U.S., are the window that actually determines whether a recently planted tree or shrub survives the summer.
What to Actually Do
Check soil moisture daily, not on a schedule
Push a finger 2–3 inches into the soil near the root zone. If it's dry at that depth, water — regardless of when you last watered.
Water deeply, early, and slowly
Morning watering gives roots time to absorb moisture before the heat of the day, and reduces evaporation loss.
Hold off on fertilizer
Fertilizing a heat-stressed plant pushes it to produce new growth it doesn't have the water reserves to support.
Mulch if you haven't already
A 2–3 inch mulch layer over the root zone meaningfully slows soil moisture loss.
Frequently Asked Questions
How do I know if my new plant is heat-stressed?
Wilting during the heat of the day that doesn't recover by evening, leaf edges browning or curling, and dry soil 2–3 inches down.
Should I water in the middle of the day during a heat wave?
Early morning is better; midday watering loses more to evaporation.
How long does heat dome stress take to show up?
Often within 2–4 days of the root zone drying out.
