Soil & potting mix
Best soil for Lacecap Hydrangea (Hydrangea macrophylla 'Mariesii Perfecta')
Also called lacecap hydrangea, Blue Wave hydrangea.
More about lacecap hydrangea
About Lacecap Hydrangea
Hydrangea macrophylla 'Mariesii Perfecta' · also called lacecap hydrangea, Blue Wave hydrangea · flowering
'Mariesii Perfecta', long sold as Blue Wave, is a classic lacecap hydrangea with flat flowerheads of tiny fertile florets ringed by showy sterile sepals. Flowers turn blue on acidic soil and pink on alkaline. It is a rounded deciduous shrub for part shade, blooming on old wood in summer, and prefers moist, fertile soil.
Preferred mix: Moist, fertile, humus-rich, free-draining loam
Watch for — Wilting in heat: Large leaves wilt fast in sun and dry soil. Site in part shade, mulch, and water deeply and consistently; midday wilt that recovers overnight is usually just heat stress.
Why lacecap hydrangea needs this mix
Lacecap Hydrangea 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.
- Lacecap Hydrangea 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 lacecap hydrangea 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 lacecap hydrangea — 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 lacecap hydrangea 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 lacecap hydrangea?
This is the whole game: Lacecap Hydrangea 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 lacecap hydrangea; 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 lacecap hydrangea covers the timing and technique step by step.
Lacecap Hydrangea soil — frequently asked questions
What is the best soil mix for lacecap hydrangea?
3 parts ericaceous (acidic) compost : 1 part composted pine bark or pine needles : 1 part perlite or coarse grit. Lacecap Hydrangea 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 lacecap hydrangea?
Ordinary multipurpose or garden compost is far too alkaline for lacecap hydrangea — expect classic yellowing, weak growth and a slow decline over a season or two. Bagged ericaceous compost is the correct, easy base for lacecap hydrangea; 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 lacecap hydrangea need a special pH?
This is the whole game: Lacecap Hydrangea 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 lacecap hydrangea?
Bagged ericaceous compost is the correct, easy base for lacecap hydrangea; 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 lacecap hydrangea?
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
- Lacecap Hydrangea care — the full brief (light, water, humidity, problems, pet safety)
- How often to water lacecap hydrangea — the schedule the mix feeds into
- Repotting lacecap hydrangea — 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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