Soil & potting mix
Best soil for Full Moon Maple (Acer shirasawanum 'Aureum')
Also called golden full moon maple.
More about full moon maple
About Full Moon Maple
Acer shirasawanum 'Aureum' · also called golden full moon maple · flowering
Golden full moon maple is a slow, refined deciduous tree with rounded, fan-pleated chartreuse-gold leaves that glow through summer and flush orange-red in autumn. Unlike palmate Japanese maples its foliage holds bright golden colour well, but only in dappled light. It needs shelter, even moisture, and free-draining acidic soil to avoid scorch.
Preferred mix: Moist, humus-rich, free-draining acidic to neutral loam
Watch for — Sun scorch and bleaching: The golden leaves burn and fade in strong sun. Plant in dappled shade with shelter from wind, and keep soil evenly moist to reduce stress.
Why full moon maple needs this mix
Full Moon Maple 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.
- Full Moon Maple 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 full moon maple 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 full moon maple — 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 full moon maple 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 full moon maple?
This is the whole game: Full Moon Maple 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 full moon maple; 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 full moon maple covers the timing and technique step by step.
Full Moon Maple soil — frequently asked questions
What is the best soil mix for full moon maple?
3 parts ericaceous (acidic) compost : 1 part composted pine bark or pine needles : 1 part perlite or coarse grit. Full Moon Maple 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 full moon maple?
Ordinary multipurpose or garden compost is far too alkaline for full moon maple — expect classic yellowing, weak growth and a slow decline over a season or two. Bagged ericaceous compost is the correct, easy base for full moon maple; 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 full moon maple need a special pH?
This is the whole game: Full Moon Maple 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 full moon maple?
Bagged ericaceous compost is the correct, easy base for full moon maple; 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 full moon maple?
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
- Full Moon Maple care — the full brief (light, water, humidity, problems, pet safety)
- How often to water full moon maple — the schedule the mix feeds into
- Repotting full moon maple — 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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