Soil & potting mix
Best soil for Amorphophallus hewittii (Amorphophallus hewittii)
Also called Hewitt's amorphophallus.
More about amorphophallus hewittii
About Amorphophallus hewittii
Amorphophallus hewittii · also called Hewitt's amorphophallus · tropical
Amorphophallus hewittii is a rare tuberous aroid from Borneo, prized by collectors for its strikingly marbled snakeskin petiole and dramatic single umbrella leaf. Like its relatives it grows from a dormant corm, demands warm, humid, free-draining conditions in leaf, and rests dry through dormancy. All parts carry irritating calcium oxalate.
Preferred mix: Loose, humus-rich, very free-draining loam
Watch for — Tuber rot: Wet, cold or poorly drained soil — especially during dormancy — rots the corm. Use a very free-draining mix and keep the dormant tuber dry.
Why amorphophallus hewittii needs this mix
Amorphophallus hewittii is an easy-going houseplant — it just wants a free-draining general mix that holds some moisture but never stays soggy.
- Amorphophallus hewittii is adaptable, but like most houseplants it still needs air at the roots — a mix that drains freely while holding a working moisture reserve.
- A little perlite or bark stops ordinary compost compacting into an airless block over time, which is the slow, common cause of decline.
- It is not fussy about pH or special ingredients; getting the air-to-moisture balance right is what matters.
For the full picture on what makes up a good mix, see our guide to the main types of soil and potting media — it explains why each ingredient above behaves the way it does.
What goes wrong with the wrong mix
The wrong soil is one of the most common reasons amorphophallus hewittii struggles, and the damage often shows up weeks later as a watering problem. For this species specifically:
- Plain garden soil or a cheap, claggy compost compacts in the pot and slowly suffocates amorphophallus hewittii's roots.
- A pure peat mix that dries to a hard, water-repelling block is hard to re-wet and stresses the plant.
- No drainage hole turns even a good mix into a stagnant, root-rotting sump.
Reusing tired, compacted old compost or skipping the perlite. A free-draining mix in a pot with a hole solves most "why is it struggling" cases for amorphophallus hewittii.
pH — does it matter for amorphophallus hewittii?
Amorphophallus hewittii is not fussy about pH — a slightly acidic to neutral mix (around pH 6.0-7.0), which a standard peat-free compost provides, is perfectly fine. No testing needed.
If you want to check or adjust it, the soil pH guide walks through testing and the safe ways to nudge a mix more acidic or more alkaline.
DIY mix vs a bagged one
A decent bagged houseplant compost works for amorphophallus hewittii as long as you mix in perlite for air. The simple DIY ratio above is cheap and more reliable than a budget bag alone.
Drainage and the pot
A pot with a drainage hole and a saucer you empty after watering is all amorphophallus hewittii needs — the free-draining mix does the rest.
Refresh amorphophallus hewittii's mix every 18-24 months; even good compost slumps and compacts, and fresh, airy mix is often the simplest fix for a tired plant. When the time comes, our repotting guide for amorphophallus hewittii covers the timing and technique step by step.
Amorphophallus hewittii soil — frequently asked questions
What is the best soil mix for amorphophallus hewittii?
3 parts peat-free houseplant compost : 1 part perlite : 1 part orchid bark or coco chips (optional). Amorphophallus hewittii is adaptable, but like most houseplants it still needs air at the roots — a mix that drains freely while holding a working moisture reserve.
Can I use normal potting soil for amorphophallus hewittii?
Plain garden soil or a cheap, claggy compost compacts in the pot and slowly suffocates amorphophallus hewittii's roots. A decent bagged houseplant compost works for amorphophallus hewittii as long as you mix in perlite for air. The simple DIY ratio above is cheap and more reliable than a budget bag alone.
Does amorphophallus hewittii need a special pH?
Amorphophallus hewittii is not fussy about pH — a slightly acidic to neutral mix (around pH 6.0-7.0), which a standard peat-free compost provides, is perfectly fine. No testing needed.
Should I buy a bagged mix or make my own for amorphophallus hewittii?
A decent bagged houseplant compost works for amorphophallus hewittii as long as you mix in perlite for air. The simple DIY ratio above is cheap and more reliable than a budget bag alone.
How often should I refresh the soil for amorphophallus hewittii?
Refresh amorphophallus hewittii's mix every 18-24 months; even good compost slumps and compacts, and fresh, airy mix is often the simplest fix for a tired plant. A pot with a drainage hole and a saucer you empty after watering is all amorphophallus hewittii needs — the free-draining mix does the rest.
Keep reading
- Amorphophallus hewittii care — the full brief (light, water, humidity, problems, pet safety)
- How often to water amorphophallus hewittii — the schedule the mix feeds into
- Repotting amorphophallus hewittii — when and how to refresh the mix
- Soil pH guide — test it and adjust it safely
- Should I water my plant? The simple check first
- Overwatered plant — signs and recovery
- Root rot — how the wrong soil starts it, and how to save the plant
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