Soil & potting mix
Best soil for Green Shiso (Perilla frutescens var. crispa f. viridis)
Also called Green Shiso, Green Perilla, Ao Shiso, Japanese Basil, Green Beefsteak Plant.
More about green shiso
About Green Shiso
Perilla frutescens var. crispa f. viridis · also called Green Shiso, Green Perilla · edible
An aromatic annual culinary herb essential to Japanese and Korean cuisines, prized for its bright green, frilly-edged leaves with a complex flavour blending mint, basil, anise, and citrus. Used fresh in sushi, salads, tempura, and as a garnish. Thrives in warm, humid conditions with regular harvesting to prevent premature bolting. Grows quickly from seed.
Preferred mix: Rich, moist, well-drained loam, pH 5.5–6.5
Watch for — Damping off in cool, wet conditions: Seedlings are susceptible to damping off if sown in cold, waterlogged compost. Sow only when soil temperature is above 18°C, use sterile seed compost, and ensure good drainage and airflow around seedling trays.
Why green shiso needs this mix
Green Shiso is a hungry, thirsty crop — it wants a rich, moisture-retentive but free-draining loam, well fed and never baked dry.
- Green Shiso grows fast and has a big crop to fill, so it draws heavily on both nutrients and water — a lean mix simply cannot keep up.
- Plenty of organic matter holds moisture evenly, which prevents the stress problems (bolting, bitterness, blossom-end rot) that come from a drying-then-flooding cycle.
- It still needs structure: rich does not mean airless, so grit, perlite or leaf mould keeps roots oxygenated.
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 green shiso struggles, and the damage often shows up weeks later as a watering problem. For this species specifically:
- A poor, thin or sandy mix starves green shiso — growth stalls, leaves pale, and yields collapse.
- A heavy, compacted, badly drained soil rots the roots and brings fungal problems despite all the feeding.
- Letting a rich mix dry to dust then drowning it causes the classic moisture-stress disorders this crop is prone to.
Under-feeding and inconsistent moisture. Green Shiso needs genuinely rich soil plus steady watering — most disappointing crops come down to one or both being short.
pH — does it matter for green shiso?
Green Shiso does best around pH 6.0-7.0 (slightly acidic to neutral). It is worth a cheap soil test for an outdoor bed; very acidic soil benefits from a little lime well before planting.
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
For containers a good multipurpose or vegetable compost works for green shiso with extra feed through the season. For beds, the real win is digging in plenty of well-rotted compost or manure — that beats any bag.
Drainage and the pot
Rich but free-draining is the target: raised beds and large containers both deliver it. Mulch heavily to even out moisture and roughly halve how often you water.
Green Shiso is usually grown for a single season, so "repotting" means starting fresh each year — never reuse exhausted, disease-prone compost for the same crop family. When the time comes, our repotting guide for green shiso covers the timing and technique step by step.
Green Shiso soil — frequently asked questions
What is the best soil mix for green shiso?
3 parts compost-amended loam or quality multipurpose compost : 1 part well-rotted garden compost or manure : 1 part perlite or grit (containers) / leaf mould (beds). Green Shiso grows fast and has a big crop to fill, so it draws heavily on both nutrients and water — a lean mix simply cannot keep up.
Can I use normal potting soil for green shiso?
A poor, thin or sandy mix starves green shiso — growth stalls, leaves pale, and yields collapse. For containers a good multipurpose or vegetable compost works for green shiso with extra feed through the season. For beds, the real win is digging in plenty of well-rotted compost or manure — that beats any bag.
Does green shiso need a special pH?
Green Shiso does best around pH 6.0-7.0 (slightly acidic to neutral). It is worth a cheap soil test for an outdoor bed; very acidic soil benefits from a little lime well before planting.
Should I buy a bagged mix or make my own for green shiso?
For containers a good multipurpose or vegetable compost works for green shiso with extra feed through the season. For beds, the real win is digging in plenty of well-rotted compost or manure — that beats any bag.
How often should I refresh the soil for green shiso?
Green Shiso is usually grown for a single season, so "repotting" means starting fresh each year — never reuse exhausted, disease-prone compost for the same crop family. Rich but free-draining is the target: raised beds and large containers both deliver it. Mulch heavily to even out moisture and roughly halve how often you water.
Keep reading
- Green Shiso care — the full brief (light, water, humidity, problems, pet safety)
- How often to water green shiso — the schedule the mix feeds into
- Repotting green shiso — 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
- Why is my plant wilting? Wet vs dry diagnosis
- Underwatered plant — signs and how to rehydrate it
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- All 8452 soil and potting-mix guides in the Growli library