Concrete Planter Care in Summer: Prevent Cracks & Discolouration

As someone who handcrafts concrete pots, I know how beautifully durable they are, but even the sturdiest materials need a little extra care in summer. Whether it’s intense sun, sudden downpours or overwatering, the warmer months can take a toll on your planters.

The good news? It doesn’t take much. With a little TLC, you can keep your concrete planters looking their best all season long. Here’s how I care for mine and the tips I always share with customers about concrete planter care.

Concrete Planter Care in Summer: Prevent Cracks & Discolouration

1. Seal to Shield

Concrete is naturally porous, which means it can absorb moisture, minerals and dirt. Over time, this can lead to surface stains or fine cracks, especially during hot, dry spells.

What to do: Apply a breathable, water-repellent sealer in spring. This helps protect your planter from absorbing too much water and prevents UV-related fading. I use H-Seal Concrete Sealer, but you can easily find other options on Amazon or your local hardware store

Tip: Use a non-toxic or food-safe sealer if you’re growing herbs or edible plants.

2. Raise It with Pot Feet

One of the simplest ways to extend the life of your pot is to raise it slightly off the ground. Direct contact with a hot patio or soggy soil can lead to cracking or mould buildup.

What to do: Use pot feet, risers or even a small tile underneath your planter. This improves airflow and helps prevent moisture damage. We have some great options in store: here.

3. Water at the Right Time

Watering your plants in the heat of the day might cool them down, but it’s not ideal for concrete. Pouring cold water into a hot planter can cause stress fractures or spalling (surface flaking).

What to do: Water your pots in the early morning or late evening when temperatures are lower and the concrete isn’t in direct sunlight.

4. Avoid Harsh Cleaners

Over time, planters may develop a build-up of soil, water stains or algae—especially if they’re outdoors. While it’s tempting to scrub them down, aggressive cleaning can damage the finish.

What to do: Wipe the surface with a soft cloth and mild, soapy water. Avoid using bleach or acidic cleaners, as they can discolour the surface or degrade the concrete.

5. Shade & Rotate

Too much direct sunlight can cause discolouration over time, especially on lighter finishes. The sun may also dry out the soil too quickly, causing stress to your plants.

What to do: Move your pots to a partially shaded area during the hottest hours of the day. If they’re heavy or fixed, consider rotating them occasionally to maintain even fading.

Extra Tip: Refresh the Look

If your planter is looking tired, consider a light wax buff, a fresh coat of sealer, or even a gentle limewash. These minor updates can bring out the natural character of the concrete while giving it a soft, matte finish.

Concrete Planter Summer Care FAQs

1. Do I need to seal my concrete planter?

Yes, I recommend doing so, especially if they're kept outdoors. Sealing helps protect against water damage, fading, and staining. It also makes cleaning easier.

2. How often should I reseal my planter?

Once a year is ideal. Spring is the perfect time to clean, dry and reseal your pots before the summer heat kicks in.

3. Can I leave my concrete planter outside all year?

Yes, but in extreme weather (especially frost), bring them indoors or raise them off cold surfaces. Cracks are more likely when water expands in freezing temperatures.

4. Why is my planter turning white or patchy?

This is likely efflorescence—a build-up of salts from water or soil. It’s harmless and can be gently cleaned off with a vinegar-water solution.

5. My pot has a small crack—what should I do?

Hairline cracks are often just surface-level and cosmetic. To prevent further damage, clean the area and apply a sealer. Avoid overwatering.