Soil & potting mix
Best soil for MacGillivray's Wax Plant (Hoya macgillivrayi)
Also called MacGillivray's wax plant, Red hoya, MacGillivray's hoya.
More about macgillivray's wax plant
About MacGillivray's Wax Plant
Hoya macgillivrayi · also called MacGillivray's wax plant, Red hoya · tropical
Hoya macgillivrayi is a fast-growing, twining climber endemic to the Iron Range and McIlwraith Range of Cape York Peninsula, Queensland, Australia, where it scrambles through rainforest at the forest edge. It produces some of the largest flowers in the genus — up to 6 cm across — in rich burgundy red, with a glorious citrus-and-gardenia fragrance that can last up to three weeks; the most important care tip is to keep it slightly pot-bound and reduce watering in winter to encourage prolific flowering. The ASPCA lists the Hoya genus as non-toxic to cats and dogs.
Preferred mix: Loose, peaty, free-draining mix
Why macgillivray's wax plant needs this mix
MacGillivray's Wax Plant is an easy-going houseplant — it just wants a free-draining general mix that holds some moisture but never stays soggy.
- MacGillivray's Wax Plant 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 macgillivray's wax plant 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 macgillivray's wax plant'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 macgillivray's wax plant.
pH — does it matter for macgillivray's wax plant?
MacGillivray's Wax Plant 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 macgillivray's wax plant 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 macgillivray's wax plant needs — the free-draining mix does the rest.
Refresh macgillivray's wax plant'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 macgillivray's wax plant covers the timing and technique step by step.
MacGillivray's Wax Plant soil — frequently asked questions
What is the best soil mix for macgillivray's wax plant?
3 parts peat-free houseplant compost : 1 part perlite : 1 part orchid bark or coco chips (optional). MacGillivray's Wax Plant 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 macgillivray's wax plant?
Plain garden soil or a cheap, claggy compost compacts in the pot and slowly suffocates macgillivray's wax plant's roots. A decent bagged houseplant compost works for macgillivray's wax plant 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 macgillivray's wax plant need a special pH?
MacGillivray's Wax Plant 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 macgillivray's wax plant?
A decent bagged houseplant compost works for macgillivray's wax plant 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 macgillivray's wax plant?
Refresh macgillivray's wax plant'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 macgillivray's wax plant needs — the free-draining mix does the rest.
Keep reading
- MacGillivray's Wax Plant care — the full brief (light, water, humidity, problems, pet safety)
- How often to water macgillivray's wax plant — the schedule the mix feeds into
- Repotting macgillivray's wax plant — 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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