Soil & potting mix
Best soil for Tamanu (Calophyllum inophyllum)
Also called Tamanu, Alexandrian Laurel, Beach Calophyllum, Poon Tree, Kamani.
More about tamanu
About Tamanu
Calophyllum inophyllum · also called Tamanu, Alexandrian Laurel · tropical
Tamanu is a large coastal tropical tree prized for its dense, glossy canopy and oil-rich seeds used in skincare. It thrives in full sun, tolerates salt spray and sandy soils, and produces fragrant white flowers followed by round yellow-green drupes. Best suited to humid, frost-free climates with warm temperatures year-round.
Preferred mix: Sandy, well-draining loam; tolerates coastal sandy soils
Watch for — Root rot in heavy soils: In clay or waterlogged soils, roots are prone to fungal rot. Ensure excellent drainage or plant on a raised mound. Symptoms include yellowing leaves and wilting despite moist soil.
Why tamanu needs this mix
Tamanu is an easy-going houseplant — it just wants a free-draining general mix that holds some moisture but never stays soggy.
- Tamanu 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 tamanu 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 tamanu'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 tamanu.
pH — does it matter for tamanu?
Tamanu 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 tamanu 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 tamanu needs — the free-draining mix does the rest.
Refresh tamanu'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 tamanu covers the timing and technique step by step.
Tamanu soil — frequently asked questions
What is the best soil mix for tamanu?
3 parts peat-free houseplant compost : 1 part perlite : 1 part orchid bark or coco chips (optional). Tamanu 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 tamanu?
Plain garden soil or a cheap, claggy compost compacts in the pot and slowly suffocates tamanu's roots. A decent bagged houseplant compost works for tamanu 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 tamanu need a special pH?
Tamanu 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 tamanu?
A decent bagged houseplant compost works for tamanu 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 tamanu?
Refresh tamanu'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 tamanu needs — the free-draining mix does the rest.
Keep reading
- Tamanu care — the full brief (light, water, humidity, problems, pet safety)
- How often to water tamanu — the schedule the mix feeds into
- Repotting tamanu — 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
- Best soil for rambutan
- Best soil for pulasan
- Best soil for salak
- All 8452 soil and potting-mix guides in the Growli library