Peat Moss Vs. Coco Coir: Pros And Cons To Consider

Peat moss vs. coco coir. How do these two soil amendments compare? Many gardeners were told by their parents and grandparents that adding peat moss to garden and potting soil improves the soil structure. But today ecologists tell us that peat moss is being harvested for this use at non-sustainable rates. Coco coir, (aka coco dust, coco fiber, or coconut coir mulch) is proposed as an alternative.

So let’s look at coco fiber vs. peat moss. Will coco coir actually do the job? The simple answer is yes, but read on for the details.

Peat Moss vs. Coco Coir

The question of coco coir vs. peat moss is more than an issue of which is more effective as a soil amendment. There are bigger things at play here.

Let’s start by looking at these two materials and where they come from. That’s critical because the main advantage of coco coir is that it is not endangered. Peat takes hundreds of years to form and plays a vital role in a wetland's ecosystem. Coco coir is often tossed as detritus.

Peat Moss Pros and Cons

We all are aware of the value of wetlands as ecosystems. They support a multitude of plant and animal life. Peat comes from peat bogs, which are a special kind of wetlands. Occupied by peat mosses, peat bogs acidify the wet soil to the point that only acid-loving plants can thrive there, including unique, carnivorous plants like pitcher plants and Venus fly-traps.

Bacterial decomposition is slowed by the acidity, so as the centuries pass, layers of peat moss are squeezed and compressed into the substance called peat. But there is a limited amount of peat, and more of it is being extracted and used commercially than is being produced.

When peat is extracted from the bog and added to garden soil, it improves the structure of the soil. However, take note: peat does not act as a fertilizer or add any nutrients. Rather, it amends the soil, making it lighter so that air can enter, and the soil can be moist without getting soggy. This helps plants to grow.

Peat moss aerates soil well and is easy to buy in commerce, since it comes from Canada. On the other hand, it is extremely acidic, and once it is wet, it is hard to wet again.

Coco Coir Pros and Cons

So where does coco coir come from? It may not surprise you that it comes from coconut palm trees. Coconuts are harvested and husked before being sold commercially. During this process, the longer fibers are sold for use in upholstery stuffing, rope, and brushes. What about the short fibers? This substance used to be considered detritus and tossed, but today is used in gardening as coconut coir or coco peat. Coir, then, is a renewable resource and its new role in gardening makes constructive use out of a waste product.

Coir holds moisture well and rehydrates easily. Like peat, it is low in nutrients, but works well as a soil amendment. It is less acidic, closer to neutral in pH value. On the down side, it is shipped from overseas and is more difficult to buy in bulk.

Which One Is Better?

Comparing coco coir vs peat moss in terms of practicality for horticulture, both products work well. Coir wets more easily than peat, drains well, and withstands compression better than peat. In addition, it has none of the peat bog detritus that peat has.

But given the differences in ecological impact, there can be no question that in the peat moss vs. coco peat balance, it is far better to buy coco coir than peat.