Manyorchid cultivarscan grow in a one-ingredient medium, while some varieties prefer only certain materials.

Many high-quality orchid growing mixes offer a variety of benefits, depending on the media included.

Choosing Soil for Orchids

There are many components that can go into an effective orchid soil mix.

Potted orchid plant with white flowers suspended in handing planter near window

The Spruce / Phoebe Cheong

If you are unsure, you’re able to purchase a high-quality, pre-made mix designed for orchids.

Cobblestone also works well as an anchor in an orchid pot, helping top-heavyorchids likeDendrobiumstay upright.

Cobblestone does not retain water.

a phalaenopsis orchid

The Spruce / Phoebe Cheong

Cork

Anyone with a vintage bottle of wine is familiar with the watertight qualities of cork.

The larger cork chips offer many crevices for orchid roots to explore.

Lava Rock

You will commonly see this inorganic growing medium used in orchids imported from Hawaii.

Pile coconut coir fibers for orchid growing material closeup

The Spruce / Phoebe Cheong

Lava rock retains water and increases humidity.

Perlite

Perliteis actually the end result of volcanic glass exposed to high heat.

Although perlite doesnt contribute any nutrients to orchid plants, it has excellent water retention and aeration properties.

Pile of brown lava rocks for orchid growing material closeup

The Spruce / Phoebe Cheong

The rock is highly porous and holds up to 50 percent of its weight in water.

It’s also quite lightweight, so it won’t weigh your plant down.

Its big advantage is that it will never break down in your orchid potting mix.

Pile of small white perlite rocks for orchid growing material closeup

The Spruce / Phoebe Cheong

Shredded Bark

Shredded barkfrom trees like fir, cedar, and cypress.

Bark will acidify your orchid mix as it breaks down.

It is also favored for its natural look and pleasant fragrance.

Pile of shredded bark chips for orchid growing material closeup

The Spruce / Phoebe Cheong

Sphagnum Moss

Weed- and pathogen-freesphagnum mossmaintains a moist environment for your orchid roots.

It won’t become soggy, though, which is why it’s a popular choice.

Styrofoam

Orchids that like periods of dryness may thrive when grown in a Styrofoam medium.

Pile of sphagnum moss for orchid growing material closeup

The Spruce / Phoebe Cheong

Simple Styrofoam peanuts can become an eco-friendly growing medium, giving you a chance to recycle the material.

you might also buy special Styrofoam pellets that are produced forepiphytic plants.

Vermiculite

Vermiculite is commonly found at garden stores that sell a variety of potting soil amendments.

Pile of vermiculite gravel for orchid growing material closeup

The Spruce / Phoebe Cheong

The best time to repot an orchid is after it’s done flowering.

Water once the roots and medium are completely dry.

The roots ofPhalaenopsisorchids are silver when dry; green or blue roots are still moist.

When watering, water throughly, allowing the excess water to drip out of the holes of the pot.

Do not water on a set schedule.

Addorchid fertilizerto the water, as described by the product’s manufacturer.

Research what is best for your species of orchid.