It's been five weeks since we planted, and overall the garden is looking great. But a few plants seem to be struggling, and a couple have struggled from the very start. We also noticed something telling: the top of the soil is running warm.

That's usually a sign the soil is losing water faster than the plants can use it. So it was time to up our gardening game with one simple, inexpensive step: adding a layer of mulch on top. We used bark, but as you'll see below, almost any mulch will do the job.

Check it out:

Here's why we love this combo: Mulch and ollas work together like a dream. Thirsty Earth Ollas deliver water slowly and directly to the roots underground, while a layer of mulch on top seals that moisture in — stopping the sun and wind from stealing it before your plants can use it.

The result is less water wasted, no dealing with the hose, and healthier, happier plants pulling exactly what they need from the soil.

It looks tidy and finished, but the real win is underneath the surface.

What mulch actually does for your garden

Mulch isn't just a cosmetic touch. A 2–3 inch layer goes to work the moment it's down — whether it's bark mulch, straw, or shredded leaves.

1. It reduces evaporation from sun and wind

Bare soil loses water two ways: the sun bakes moisture out of the surface, and wind pulls it off the top. A layer of mulch blocks both, so the water you put down stays in the soil and reaches the roots instead of disappearing into the air. That means less frequent watering and steadier moisture between waterings.

2. Mulch insulates the roots

Mulch acts like a blanket for your soil. In hot weather it keeps the root zone cooler and protected from heat stress. When temperatures drop, it helps hold warmth in. That steadier soil temperature is exactly what struggling plants need to recover and put on healthy growth.

3. Mulch breaks down into better soil over time

Organic mulches slowly decompose, adding organic matter back into the bed. Over a season or two that improves soil structure, helping it hold moisture and feed your plants more effectively. So the layer you add today keeps paying off long after it's down.

4. Mulch just looks good

A clean mulch layer makes a garden look finished and cared for. That's a bonus on top of the real benefits below the surface.

How to tell your garden needs mulch

You don't need a soil test to spot the signs. Watch for:

• Warm topsoil. If the surface feels hot to the touch on a sunny day, you're losing moisture fast.
• Plants struggling despite regular watering. Often the water isn't staying in the soil long enough.
• Soil that dries out quickly between waterings or forms a hard crust on top.

If you're seeing any of these a few weeks into the season, a layer of mulch is a quick fix.

How to apply mulch the right way...

Keep it simple:

• Aim for a 2–3 inch layer across the bed. Thinner than that won't hold moisture well; much thicker can keep water from reaching the soil.
• Leave a small gap around stems and trunks. Mulch piled directly against a plant's base can trap moisture and invite rot.
• Apply it after watering so you're locking moisture in, not sealing dry soil.

Types of mulch to choose from

Bark mulch is a popular choice because it looks clean and breaks down slowly, but it's far from your only option. If you have these on hand, they work just as well:

• Bark mulch — tidy, long-lasting, great for visible beds
• Pine needles — light and easy to spread
• Shredded leaves — free if you rake them yourself
• Dry grass clippings — a good use for lawn trimmings
• Straw — inexpensive and ideal for vegetable gardens

Each one does the same core job: cutting evaporation, insulating roots, and breaking down into the soil over time. Use whatever is affordable and available to you.

Make sure your mulch is untreated and has not been sprayed with pesticides though. It can kill your garden.

Pair mulch with deep watering for the biggest water savings

Mulch solves the problem at the surface, stopping water from evaporating before plants can use it. But you still want water getting deep to the roots where it counts.

That's where an olla does the rest of the work. An olla is a buried clay vessel that releases water slowly and directly into the root zone underground, so almost none is lost to evaporation on the way down. Mulch on top, olla below: water goes in, stays in, and reaches the roots. Together they can dramatically cut how often you need to water, which matters most in hot, dry, or windy conditions.

Frequently asked questions

Does mulch really reduce how often I need to water?

Yes. By blocking sun and wind from drying out the surface, mulch helps soil hold moisture longer, so you water less often and more of that water reaches the roots.

How thick should a layer of mulch be?

About 2–3 inches. That's enough to suppress evaporation and insulate roots without blocking water from soaking in.

Will mulch keep my plant roots cooler in summer?

Yes. Mulch insulates the soil, keeping the root zone cooler during heat and helping retain warmth when temperatures drop.

Does mulch improve the soil?

Organic mulches like bark, leaves, and straw break down over time and add organic matter, which improves soil structure and its ability to hold moisture and nutrients.

What kinds of mulch can I use?

Bark mulch, pine needles, shredded leaves, dry grass clippings, and straw all work well and provide the same moisture-retention and insulation benefits.

Can I use mulch and an olla together?

Absolutely. They're complementary. Mulch stops evaporation at the surface and an olla delivers water below ground straight to the roots, giving you the most efficient watering setup.

A few weeks into the season is the perfect time to add mulch and rescue any plants that are struggling. Pair it with deep root watering and you'll spend little to no time with the hose and more time enjoying a healthy garden.