What To Do If You Find Potted Plant Stains On Your Concrete Patio

You've decided to shake up your container garden layout for the season, which involves moving the plants around your concrete patio or porch. When you lift the first one up, you uncover a frustrating problem — under the pot is a dark stain. If you garden in planters, you've probably encountered these ugly rings on your concrete surfaces. It's an annoying issue to encounter when you're trying to refresh a tired outdoor living space. Nobody wants to see ugly stains when they're relaxing in their backyard. You don't need to hire a professional cleaning crew to tackle these marks. They're usually just a natural byproduct of watering your potted plants. You can clean your concrete patio in three simple steps — a scrub, some mild acid if needed, and a few preventative measures.

When you water your container garden, moisture can accumulate underneath the pots. Excess liquid can drip out from the drainage holes. Instead of evaporating, it can get trapped underneath the pot, where it sits, soaking into the porous concrete patio. Whether you use municipal water or well water to water your plants, it can contain soil runoff (like tannins), minerals, and fertilizer residue — all of which can cause that dreaded ring-shaped stain. It's especially prevalent if a planter has been sitting in the same spot for months on end. Fortunately, you can treat this kind of stain pretty easily with the right cleaning tools and supplies on hand.

Sometimes concrete stains from planters have more bark than bite. You might be able to get rid of them with a hard jet of water from your garden hose. If that doesn't cut it, you'll need to add a little elbow grease. Here's an easy way to clean concrete: grab a stiff scrubbing brush (non-metal to avoid rust stains or scratches), along with some hot water mixed with mild dish soap. Scrub the area and rinse it with fresh water.

If the stain refuses to budge, it could be mineral-based. You'll need to use a mild acid, like white vinegar, on the mark. Saturate the stain and leave it to sit for at least two hours, giving the acid time to act on the minerals. Once the hour is up, scrub the mark and flush the area clean. You can get rid of rust stains on concrete with this DIY method: mix two parts water with one part oxygenated bleach, let the mixture sit on the mark for 10 to 15 minutes, then scrub and rinse. Alternatively, a quick blast from a pressure washer would likely banish these stubborn blemishes.

Once your patio looks like new again, it's time to figure out how to keep pot plant stains from returning. Start by creating better airflow under your pots — lift them off the ground using Bosmere Terra Cotta Pot Toes or similar risers. Alternatively, place a tray or saucer underneath each planter to catch excess water. Just remember to empty them after you finish watering your container garden or you risk root rot and mosquitoes.