Soil & Potting

How to Make an Aroid Soil Mix

Step-by-step recipe for a chunky, well-aerated aroid soil mix that keeps monsteras, philodendrons, and pothos thriving without rotting their roots.

Aroids are the family that includes monstera, philodendron, pothos, anthurium, alocasia, and many of the most popular houseplants. In the wild most of them grow as climbers or epiphytes, their roots clinging to bark and buried in loose forest debris rather than dense soil. Standard bagged potting mix packs too tightly around these roots, holding water and choking the oxygen they crave.

A proper aroid mix recreates that loose, chunky forest floor: it holds some moisture but is full of air pockets and drains fast. Making your own is cheap, easy, and gives you far better results than any single bagged product. This guide gives you a reliable recipe and the steps to mix it.

Step by step

  1. 1
    Gather your ingredients

    Collect orchid bark (fine to medium grade), perlite or pumice, coco coir or a quality potting mix, worm castings, and optional horticultural charcoal. Have a large tub or bucket to mix in.

  2. 2
    Hydrate the coco coir

    If using a compressed coir brick, soak it in warm water until it expands and crumbles apart. Squeeze out excess so it is damp, not dripping. Skip this step if using a ready-to-use bagged mix.

  3. 3
    Measure and combine the chunky base

    Add roughly equal parts bark and perlite or pumice to your tub. These two ingredients create the air pockets and drainage that define an aroid mix, so do not skimp on them.

  4. 4
    Add the moisture-holding component

    Mix in an equal part of coco coir or potting mix. This holds just enough moisture between waterings so the mix is airy without drying out within a day.

  5. 5
    Stir in nutrients and charcoal

    Add a couple of handfuls of worm castings per gallon of mix for slow, gentle feeding, plus optional charcoal to keep the mix fresh. Combine everything thoroughly by hand until evenly blended.

  6. 6
    Test the texture and pot up

    Grab a handful and squeeze. It should feel light and crumbly and fall apart easily, not form a tight muddy ball. Pot your aroid and water until it runs freely from the drainage hole.

Why aroids need a chunky mix

Aroid roots are adapted to grip and breathe, not to sit in dense soil. They thrive when surrounded by large gaps that let air circulate and water drain through quickly. In a chunky mix, you can water generously and frequently without the roots ever staying soggy, which is exactly the rhythm these plants like during active growth.

The payoff is faster growth, bigger leaves, and far fewer cases of root rot. Many growers find that a plant that was sulking in dense potting soil takes off within weeks of being moved into a proper aroid mix, simply because the roots can finally breathe.

The core ingredients

A classic aroid mix has four components. Orchid bark provides chunky structure and air gaps. Perlite or pumice keeps the mix light and draining. Coco coir or peat holds a little moisture so the mix does not dry out instantly. Worm castings or a handful of compost add gentle nutrition. Some growers add horticultural charcoal to keep the mix sweet and resist souring.

A simple, forgiving ratio is one part potting mix, one part orchid bark, and one part perlite, with a couple of handfuls of worm castings stirred in. If you want to build entirely from scratch, try 30 percent coco coir, 30 percent bark, 30 percent perlite or pumice, and 10 percent worm castings. Exact ratios are flexible; the goal is roughly half chunky material and half moisture-holding material.

Quick tips
  • Make a big batch and store it dry in a sealed bin; it keeps for months and is ready whenever you repot.
  • Adjust the ratio per plant: more bark for alocasia and anthurium, a bit more coir for moisture-loving philodendrons.
  • Because the mix is lean, feed lightly with a balanced fertilizer during the growing season.

Plants in this guide

Monstera DeliciosaHeartleaf PhilodendronAnthurium

Related guides

How to Choose the Right Potting SoilA practical guide to picking the right potting mix for houseplants, from all-purpose bags to specialty aroid and succulent blends, and how to read the label.What Is Well-Draining Soil?Plain-English explanation of well-draining soil for houseplants: what it means, why nearly every care guide demands it, and how to tell if yours qualifies.How to Repot a Houseplant Without Killing ItRepotting refreshes tired soil and gives roots room to grow. Learn when to repot, how to choose the right pot size, and the step-by-step method that avoids transplant shock.

FAQ

Can I just use regular potting soil for my monstera?

You can, but plain potting soil packs tightly and holds water around aroid roots, raising the risk of rot and slowing growth. Even a quick fix of stirring extra perlite and bark into bagged mix makes a noticeable difference. A dedicated chunky aroid mix gives the best results.

What is the difference between aroid mix and succulent mix?

Both drain well, but aroid mix holds more moisture and organic matter because aroids like to stay lightly damp, while succulent mix is grittier and dries out fast for desert plants. Aroid mix leans on bark and coir; succulent mix leans on pumice and sand.

How often should I water plants in an aroid mix?

Because the mix drains fast and dries more evenly, you can usually water more often than with dense soil, often when the top inch or two feels dry. Always check moisture by feel rather than a fixed schedule, since light, pot size, and season all change how fast it dries.