Soil & potting mix
Best soil for Scarletta Leucothoe (Leucothoe fontanesiana 'Scarletta')
Also called Scarletta leucothoe, Scarletta fetterbush, Scarletta dog hobble.
More about scarletta leucothoe
About Scarletta Leucothoe
Leucothoe fontanesiana 'Scarletta' · also called Scarletta leucothoe, Scarletta fetterbush · flowering
A compact, award-winning cultivar of drooping leucothoe, 'Scarletta' (syn. 'Zeblid') is celebrated for its brilliantly scarlet new foliage in spring, transitioning to deep, shiny green in summer then rich bronze-purple in winter. Denser and more symmetrical than the species, it suits smaller gardens, containers, and mixed borders in dappled shade and acidic soil.
Preferred mix: Moist, humus-rich, acidic; pH 4.5–6.0
Watch for — Loss of scarlet colour: Deep shade prevents the intense spring flush of red. Position where new growth receives some morning light. Nutrient-deficient acidic soils can also reduce colour intensity; ensure adequate ericaceous fertiliser.
Why scarletta leucothoe needs this mix
Scarletta Leucothoe 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.
- Scarletta Leucothoe 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 scarletta leucothoe 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 scarletta leucothoe — 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 scarletta leucothoe 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 scarletta leucothoe?
This is the whole game: Scarletta Leucothoe 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 scarletta leucothoe; 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 scarletta leucothoe covers the timing and technique step by step.
Scarletta Leucothoe soil — frequently asked questions
What is the best soil mix for scarletta leucothoe?
3 parts ericaceous (acidic) compost : 1 part composted pine bark or pine needles : 1 part perlite or coarse grit. Scarletta Leucothoe 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 scarletta leucothoe?
Ordinary multipurpose or garden compost is far too alkaline for scarletta leucothoe — expect classic yellowing, weak growth and a slow decline over a season or two. Bagged ericaceous compost is the correct, easy base for scarletta leucothoe; 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 scarletta leucothoe need a special pH?
This is the whole game: Scarletta Leucothoe 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 scarletta leucothoe?
Bagged ericaceous compost is the correct, easy base for scarletta leucothoe; 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 scarletta leucothoe?
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
- Scarletta Leucothoe care — the full brief (light, water, humidity, problems, pet safety)
- How often to water scarletta leucothoe — the schedule the mix feeds into
- Repotting scarletta leucothoe — 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
- Best soil for streptocarpus caulescens
- Best soil for sinningia concinna
- Best soil for sinningia tubiflora
- All 8452 soil and potting-mix guides in the Growli library