Biggest Watering Mistakes During Colorado Heat Waves

Colorado summers can be beautiful, but they can also be incredibly tough on plants. Hot afternoons, low humidity, intense sunshine, and dry winds can make even experienced gardeners question whether they're watering enough.

Ironically, one of the biggest mistakes we see during heat waves isn't underwatering—it's watering the wrong way.

If your garden is struggling through the hottest weeks of summer, avoiding these common watering mistakes can make all the difference.

Mistake #1: Watering Every Afternoon

When temperatures climb into the 90s, it's tempting to grab the hose every afternoon when your plants begin to droop.

The problem is that many plants naturally wilt during the hottest part of the day as a way to conserve water. This temporary wilting doesn't necessarily mean they need more water. If the plant perks back up after the sun goes down or early the next morning, it's doing exactly what nature intended.

Watering every afternoon can actually create several problems:

  • Much of the water evaporates before reaching the roots.

  • Wet foliage during intense sun can increase plant stress.

  • Frequent shallow watering encourages roots to stay near the surface, making plants even less drought tolerant.

Instead of reacting to afternoon wilting, check your plants again in the evening or the following morning. If they're standing tall again, they likely don't need additional water.

Mistake #2: Watering a Little Every Day

One of the healthiest things you can do for your plants is encourage deep roots.

Giving plants a quick drink every day only wets the top inch or two of soil. Since that's where the water stays, roots never have a reason to grow deeper.

Deep roots are the secret to surviving Colorado's dry climate.

Instead, water thoroughly and less frequently. A deep soaking encourages roots to grow farther into the soil where temperatures stay cooler and moisture lasts longer.

As a general guideline:

  • Newly planted perennials may need watering every two to three days during extreme heat.

  • Established perennials often only need watering once or twice per week.

  • Native Colorado plants typically require even less once established.

Always let the soil—not the calendar—tell you when it's time to water.

Mistake #3: Watering at the Wrong Time of Day

Timing matters almost as much as the amount of water you apply.

Morning is Best

The ideal time to water is early in the morning, usually between 5:00 and 9:00 a.m.

Morning watering allows moisture to soak into the soil before temperatures rise while giving leaves plenty of time to dry throughout the day.

Evening is Second Best

If mornings aren't possible, watering after the sun has gone down is the next best option.

Avoid watering in the middle of the afternoon whenever possible. During the hottest hours, evaporation rates are highest, meaning more water is lost before your plants can use it.

Mistake #4: Giving Every Plant the Same Amount of Water

Not every plant has the same watering needs.

A small one-gallon perennial has a much smaller root system than a mature shrub or young tree.

Here are some general guidelines:

Newly Planted Perennials (1 Gallon)

  • Water slowly for 30 to 60 seconds with a gentle hose or watering can.

  • Check soil moisture every couple of days during heat waves.

Mature Perennials

  • Deep soak for one to two minutes every five to seven days, depending on weather and soil type.

Shrubs

  • Water slowly for five to ten minutes, allowing moisture to penetrate well below the surface.

Young Trees

  • Deep water for 15 to 30 minutes using a slow trickle around the drip line rather than directly against the trunk.

Remember, these are starting points. Sandy soils dry faster than clay soils, and containers require more frequent watering than plants growing in the ground.

Mistake #5: Assuming Cracked Soil Means You Need More Water

Seeing cracks in your garden can be alarming, but cracked soil doesn't always mean your plants are thirsty.

Colorado's clay soils naturally shrink as they dry, creating cracks during long periods of hot weather.

Before reaching for the hose, check the soil a few inches below the surface.

Simply stick your finger or a trowel into the ground about three to four inches deep.

  • If the soil is still cool and slightly moist, your plants likely have enough water.

  • If it's dry all the way down, it's time for a deep watering.

Water based on soil moisture—not just what the surface looks like.

Bonus Tip: Mulch Is Your Best Friend

One of the easiest ways to reduce watering is by adding two to three inches of organic mulch around your plants.

Mulch helps:

  • Keep soil temperatures cooler.

  • Reduce evaporation.

  • Prevent rapid drying.

  • Improve soil health as it breaks down.

  • Reduce weeds that compete for water.

Just be sure to keep mulch a few inches away from the stems and trunks of your plants to prevent rot.

Final Thoughts

Colorado summers can be challenging, but healthy plants are often more resilient than they appear.

Rather than watering every time a plant looks stressed during the afternoon, focus on deep, consistent watering, checking soil moisture below the surface, and watering during the coolest parts of the day.

At Finding Nectar Nursery, we grow plants selected for Colorado's climate and encourage gardeners to work with nature instead of against it. If you're ever unsure whether a plant is simply heat-stressed or truly struggling, stop by the nursery or send us a photo. We're always happy to help you keep your garden thriving through even the hottest days of summer.

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