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Description
tropical potting mix recipe Molly's Aroid Mix for Monstera & PhiloQuick answer: what is Molly's Aroid Mix? For: Monstera, Philodendron, Pothos, Anthurium, Alocasia, Syngonium, and every other aroid in the houseplant family. What's in it: chunky fir bark, coco coir, perlite, horticultural charcoal, worm castings. No peat moss, no soil. Why it works: aroids evolved as epiphytes on rainforest trees. Their roots want air pockets, not packed dirt. Regular potting soil suffocates them. How long it lasts: 12 18 months in
Quick answer: what is Molly's Aroid Mix?
- For: Monstera, Philodendron, Pothos, Anthurium, Alocasia, Syngonium, and every other aroid in the houseplant family.
- What's in it: chunky fir bark, coco coir, perlite, horticultural charcoal, worm castings. No peat moss, no soil.
- Why it works: aroids evolved as epiphytes on rainforest trees. Their roots want air pockets, not packed dirt. Regular potting soil suffocates them.
- How long it lasts: 12-18 months in the pot before it needs refreshing. Roughly double the lifespan of standard soil-based mixes.
- Ready to use straight from the bag. No mixing, no DIY, no rinsing.
More plant-specific guidance: Best soil for Monstera, Do orchids need soil?, Potting soil vs potting mix.
Aroids fail in regular potting soil because the soil compacts, holds water, and starves roots of air. Standard "tropical houseplant soil" is too dense for plants like Monstera, Philodendron, and Anthurium that evolved as epiphytes on rainforest trees. They want chunky, fast-draining, air-pocketed substrate, exactly what soil isn't.
Molly's Aroid Mix is engineered for that gap. A blend of orchid bark, perlite, coir, and horticultural charcoal that drains within seconds, holds humidity instead of water, and resists compaction even after months of watering.
What's in the bag
- Orchid bark (chunky): the structural backbone. Air pockets and slow decay mean roots can breathe and grip without rot.
- Coarse horticultural perlite: the drainage workhorse. Stops water from pooling at the root zone.
- Coir fiber and chips: retains the right amount of moisture without becoming soggy. Replaces peat, which compacts.
- Expanded clay (LECA): wicks moisture upward so roots get humidity, not standing water.
- Horticultural charcoal: filters salts and impurities, keeps the mix sweet through repeated watering.
- Worm castings: a slow-release nutrient base. Plants get nitrogen on demand, not in a flush.
- Beneficial microbes (Bacillus pumilus, Rhizophagus irregularis): mycorrhizae extend the root system; bacteria suppress soil-borne pathogens.
- Calcitic + dolomitic limestone: buffers pH to the slightly acidic range aroids prefer (5.8 to 6.5).
20+ organic and mineral ingredients in total. No commercial synthetic fertilizers, low peat content (blended with coconut coir to reduce overall peat usage).
Plants this is for
Designed for aroids and tropical foliage plants: Monstera (especially variegated cultivars that need maximum aeration), Philodendron, Anthurium, Pothos, Alocasia, Aglaonema, Calathea, Syngonium, ZZ plant, Sansevieria, Fiddle Leaf Fig, Palm, Hoya. Anything that wants chunky, fast-draining, humidity-retaining substrate.
Not for: succulents and cacti (use Molly's Succulent Mix) or orchids (use Molly's Orchid Mix).
How to repot
- Choose a pot 1 to 2 inches wider than the current root ball, with drainage holes. Aroids do not want to be over-potted.
- Remove the plant from its current container. Gently shake off old soil from the root system. If the old substrate has compacted into a brick, soak briefly to loosen.
- Add a layer of fresh mix to the bottom of the new pot, about 1 inch thick.
- Position the plant at the same depth it was growing before, then fill around the roots with mix. Tap the pot gently to settle, but do not press down hard. The mix should stay airy.
- Water thoroughly once. Let it drain. Do not water again until the top inch feels dry to touch.
FAQ
Can I mix this with regular potting soil?
You can, but you defeat the purpose. The reason this mix works is its chunkiness and drainage. Adding standard soil compacts the air pockets and brings back the over-watering risk. If you're trying to make a bag stretch further, mix it 1:1 with extra perlite or bark, not soil.
How often do I water with this mix?
Less often than you'd water in regular soil. Most aroids in this mix want watering every 7 to 14 days indoors. Always check the top inch with your finger first. The mix dries from the top down, so the surface drying does not necessarily mean the root zone is dry.
Will this mix work for orchids?
No. Orchids want pure bark with charcoal and almost no organic matter. The aroid mix has too much coir and microbe activity for an orchid's epiphytic root system. Use Molly's Orchid Mix for orchids.
Is the mix already fertilized?
It contains worm castings and beneficial microbes that release nutrients slowly, but no synthetic fertilizer. After the first 2 to 3 months, supplement with a balanced liquid fertilizer (NPK around 3-1-2 for aroids, diluted to half-strength) every 2 to 4 weeks during the growing season.
UPC: 628942910210. Packaged in a heat-sealed resealable bag.
Related care guide
Why our Aroid Mix is built for tropicals.
Plant-specific soil guides
Best soil for Monstera · Philodendron · Pothos · Snake plants · ZZ plants · Fiddle leaf figs
Not sure which mix your plant needs?
Take our free 60-second Soil Finder quiz → Diagnose the problem and get the exact Molly's mix and amount for your plant, plus 10% off.
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