Terracotta or Plastic: Which Pot Is Better?
Walk into any plant shop and you will see two kinds of pot doing most of the work: orange terracotta and plain plastic. People often treat the choice as a matter of looks. It is not. The pot changes how fast the soil dries, and that changes how the plant grows and how often it needs you.
Neither is better for every plant. The right pot is the one that matches what the plant wants from its soil.
How terracotta works
Terracotta is unglazed, fired clay, and it is porous. Water soaks into the walls of the pot and evaporates from the outside, and air moves through the clay to the roots. The result is soil that dries faster and more evenly, especially around the edges of the pot, and roots that get plenty of air.
Terracotta is heavy, which makes tall plants less likely to tip over. It also keeps roots slightly cooler in summer, because evaporation from the walls takes heat with it. On the downside, it breaks if dropped, it can crack in a frost, and over time the outside develops a white crust of mineral salts, which some people love and others scrub off.
How plastic works
Plastic is waterproof. The only way water leaves the soil is through the drainage hole and from the surface, so soil in a plastic pot stays moist much longer than the same soil in clay. Plastic pots are light, cheap, hard to break and easy to clean. Almost every plant you buy arrives in one, and many growers, us included, keep plants in plastic nursery pots for years.
The risk with plastic is the flip side of its strength. Because it holds water, it is much easier to overwater a plant in plastic, especially in a cool room or in winter.
Which plants suit terracotta
Choose clay for plants that like to dry out between drinks and hate sitting in damp soil. Cacti and succulents are the obvious examples. Snake plants love terracotta, and we pot most of ours in it, because the clay pulls water away from the base of the leaves where rot starts. Many herbs, such as rosemary and thyme, also prefer it.
Terracotta is also a kind choice if you know you tend to overwater. It gives you a margin for error that plastic does not.
Which plants suit plastic
Choose plastic for plants that like steady moisture and suffer when they dry out. Ferns, calatheas, peace lilies and most flowering plants fit here. In terracotta, these thirsty plants dry out so fast that you would be watering every day or two in summer.
For the most moisture-hungry plants, a self-watering pot goes a step further than plastic: a reservoir underneath keeps the soil consistently damp for a week or two at a time.
The pot changes your watering
Here is the part that catches people out. If you move a plant from plastic into terracotta, or the other way round, its needs change overnight, even though nothing else has. Keep watering a plant in its new clay pot on the same timetable you used for plastic, and it may go thirsty. Keep watering a plant in its new plastic pot as often as you did in clay, and it may rot.
That is why it makes sense to check the soil before each watering rather than following a fixed day of the week. A finger pushed two inches into the soil tells you more than the calendar ever will. Once you get to know a plant in a given pot, you will learn how often you water it without thinking, but the first few weeks after a change are worth watching closely.
Soil matters too
The pot and the soil work together. A gritty, free-draining mix in terracotta dries very quickly; a dense, peaty mix in plastic stays wet for a long time. For aroids such as monstera and pothos, we like a chunky aroid potting mix in plastic or clay: the bark and perlite keep it airy enough that plastic is safe, and moist enough that clay does not dry it out too fast.
Our verdict
- Plants that like to dry out: terracotta pot.
- Plants that like steady moisture: plastic.
- Plants that like constant moisture, or owners who travel: a self-watering planter.
- Any plant, any pot: a drainage hole. No exceptions.
If you love the look of terracotta but your plant prefers plastic, there is an easy answer. Keep the plant in its plastic nursery pot and slip it inside the clay one as a cover. You get the look of terracotta and the moisture of plastic, and you can lift the inner pot out to water and drain it in the sink.