Soil & potting mix
Best soil for Red Clockvine (Thunbergia coccinea)
Also called Red Clockvine, Scarlet Clockvine, Scarlet Thunbergia.
More about red clockvine
About Red Clockvine
Thunbergia coccinea · also called Red Clockvine, Scarlet Clockvine · tropical
Thunbergia coccinea is a stunning tropical vine from the Indian subcontinent bearing pendant racemes of scarlet-orange tubular flowers with a yellow throat from autumn through spring. Fast-growing and hummingbird-attracting, it excels on pergolas and large trellises in warm climates or as a spectacular conservatory climber in cooler regions.
Preferred mix: Fertile, well-draining loam amended with organic matter
Why red clockvine needs this mix
Red Clockvine is an easy-going houseplant — it just wants a free-draining general mix that holds some moisture but never stays soggy.
- Red Clockvine 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 red clockvine 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 red clockvine'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 red clockvine.
pH — does it matter for red clockvine?
Red Clockvine 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 red clockvine 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 red clockvine needs — the free-draining mix does the rest.
Refresh red clockvine'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 red clockvine covers the timing and technique step by step.
Red Clockvine soil — frequently asked questions
What is the best soil mix for red clockvine?
3 parts peat-free houseplant compost : 1 part perlite : 1 part orchid bark or coco chips (optional). Red Clockvine 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 red clockvine?
Plain garden soil or a cheap, claggy compost compacts in the pot and slowly suffocates red clockvine's roots. A decent bagged houseplant compost works for red clockvine 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 red clockvine need a special pH?
Red Clockvine 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 red clockvine?
A decent bagged houseplant compost works for red clockvine 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 red clockvine?
Refresh red clockvine'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 red clockvine needs — the free-draining mix does the rest.
Keep reading
- Red Clockvine care — the full brief (light, water, humidity, problems, pet safety)
- How often to water red clockvine — the schedule the mix feeds into
- Repotting red clockvine — 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 comparettia falcata
- Best soil for ionopsis utricularioides
- Best soil for lepanthes telipogoniflora
- All 8452 soil and potting-mix guides in the Growli library