Will Pea Sized Rock Keep Outdoor Potted Plants Moist?

It is a common belief that adding pea sized rocks to the bottom of outdoor potted plants helps in keeping the soil moist. But, is this really true?

The Argument for Pea Sized Rocks

Advocates of using pea sized rocks for outdoor potted plants argue that the rocks create air pockets which allow excess water to drain from the soil. This, in turn, prevents the roots from becoming waterlogged and rotting. Additionally, the rocks act as a barrier preventing soil from blocking the drainage holes thus allowing the excess water to flow out freely.

The Argument Against Pea Sized Rocks

While adding pea sized rocks to the bottom of potted plants may seem like a good idea, horticulture experts believe that it does not necessarily keep the soil moist. In fact, the rocks at the bottom of the pot may actually keep the roots too dry as they create a barrier between the soil and the water. Also, if the soil becomes too compact, the water will not be able to flow through the rocks.

Alternative Options

Instead of adding pea sized rocks, soil experts suggest the use of coffee filters, landscape fabric or even paper towels to cover the drainage holes in pots. These materials will prevent the soil from escaping and still allow the excess water to flow through. Additionally, using high-quality soil with added organic amendments or water absorbing crystals can help in holding onto moisture in the soil.

The Bottom Line

While adding pea sized rocks to outdoor potted plants may seem like a good idea, it is not necessarily the best solution for keeping the soil moist. It is important to consider other options and to choose high-quality soil to help maintain moisture in the pots. Ultimately, the key to keeping plants healthy is to provide them with proper care, including the right amount of water, sunlight and nutrients.