Soil & potting mix
Best soil for Super King Ixora (Ixora coccinea 'Super King')
Also called Super King Ixora, Super King Flame of the Woods.
More about super king ixora
About Super King Ixora
Ixora coccinea 'Super King' · also called Super King Ixora, Super King Flame of the Woods · tropical
Super King Ixora is a vigorous cultivar of Ixora coccinea selected for its exceptionally large flower clusters of brilliant red-orange blooms. More free-flowering and bolder than the species, it is a popular landscape shrub across tropical and subtropical regions, commonly used as a hedge or specimen. It requires acidic soil and full sun for best performance.
Preferred mix: Acidic, humus-rich, free-draining garden loam or container mix
Watch for — Interveinal chlorosis: 'Super King' is especially sensitive to high soil pH causing iron chlorosis — new leaves yellow while veins stay green. Test pH and amend with sulfur or acidifying fertiliser. Apply chelated iron chelate at 4-6 week intervals until colour returns. Use only soft or rainwater for irrigation.
Why super king ixora needs this mix
Super King Ixora is a true acid-lover — it physically cannot take up iron above about pH 5.5, so an ericaceous mix is not optional, it is survival.
- Super King Ixora has evolved on acidic, peaty ground and depends on soil fungi that only function in acid conditions — raise the pH and it starves even in "rich" soil.
- In a too-alkaline mix iron and manganese lock up chemically, so the youngest leaves yellow between green veins (lime-induced chlorosis) and the plant fades out.
- Its fine, shallow roots also want an open, free-draining structure, not a heavy clay or claggy compost.
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 super king ixora struggles, and the damage often shows up weeks later as a watering problem. For this species specifically:
- Ordinary multipurpose or garden compost is far too alkaline for super king ixora — expect classic yellowing, weak growth and a slow decline over a season or two.
- Hard tap water slowly pushes the pH up too, undoing a good mix; rainwater is strongly preferred for watering.
- Lime, mushroom compost or wood ash anywhere near this plant is actively harmful.
Planting super king ixora in standard compost or limey garden soil. Without an acidic (ericaceous) medium it will yellow and fail no matter how well you water and feed it.
pH — does it matter for super king ixora?
This is the whole game: Super King Ixora needs pH 4.5-5.5. Test it, use ericaceous compost (and an ericaceous feed), and water with rainwater where you can to keep the pH from creeping up.
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
Bagged ericaceous compost is the correct, easy base for super king ixora; just open it up with bark and grit per the ratio above. Do not try to acidify ordinary compost by guesswork — it rarely holds.
Drainage and the pot
Containers are often easier than open ground because you control the pH completely. Use a pot with good drainage and an ericaceous mix; never let it sit waterlogged.
Top up or refresh the ericaceous mix yearly and test the pH each spring — it naturally drifts upward over time, especially if watered with tap water. When the time comes, our repotting guide for super king ixora covers the timing and technique step by step.
Super King Ixora soil — frequently asked questions
What is the best soil mix for super king ixora?
3 parts ericaceous (acidic) compost : 1 part composted pine bark or pine needles : 1 part perlite or coarse grit. Super King Ixora has evolved on acidic, peaty ground and depends on soil fungi that only function in acid conditions — raise the pH and it starves even in "rich" soil.
Can I use normal potting soil for super king ixora?
Ordinary multipurpose or garden compost is far too alkaline for super king ixora — expect classic yellowing, weak growth and a slow decline over a season or two. Bagged ericaceous compost is the correct, easy base for super king ixora; just open it up with bark and grit per the ratio above. Do not try to acidify ordinary compost by guesswork — it rarely holds.
Does super king ixora need a special pH?
This is the whole game: Super King Ixora needs pH 4.5-5.5. Test it, use ericaceous compost (and an ericaceous feed), and water with rainwater where you can to keep the pH from creeping up.
Should I buy a bagged mix or make my own for super king ixora?
Bagged ericaceous compost is the correct, easy base for super king ixora; just open it up with bark and grit per the ratio above. Do not try to acidify ordinary compost by guesswork — it rarely holds.
How often should I refresh the soil for super king ixora?
Top up or refresh the ericaceous mix yearly and test the pH each spring — it naturally drifts upward over time, especially if watered with tap water. Containers are often easier than open ground because you control the pH completely. Use a pot with good drainage and an ericaceous mix; never let it sit waterlogged.
Keep reading
- Super King Ixora care — the full brief (light, water, humidity, problems, pet safety)
- How often to water super king ixora — the schedule the mix feeds into
- Repotting super king ixora — when and how to refresh the mix
- Soil pH guide — test it and adjust it safely
- Root rot — how the wrong soil starts it, and how to save the plant
- Underwatered plant — signs and how to rehydrate it
- Should I water my plant? The simple check first
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- All 6887 soil and potting-mix guides in the Growli library