Soil & potting mix
Best soil for Tat Soi 'Yukina Savoy' (Brassica rapa var. narinosa 'Yukina Savoy')
Also called Yukina Savoy, savoy tatsoi, Japanese savoy mustard.
More about tat soi 'yukina savoy'
About Tat Soi 'Yukina Savoy'
Brassica rapa var. narinosa 'Yukina Savoy' · also called Yukina Savoy, savoy tatsoi · edible
'Yukina Savoy' is an upright, cold-hardy Asian green, a heat-tolerant tatsoi type with thick, blistered (savoyed) dark-green leaves on pale stems. Mild and slightly mustardy, it crops fast in cool weather, resists bolting better than flat tatsoi, and sweetens after light frost. Harvest as cut-and-come-again baby leaf or as full rosettes.
Preferred mix: Fertile, moisture-retentive loam, pH 6.0-7.5
Watch for — Downy / club root: Crowded, wet rosettes invite downy mildew; acidic or waterlogged ground risks clubroot. Space plants, water at the base, and rotate brassicas on a 3-4 year cycle.
Why tat soi 'yukina savoy' needs this mix
Tat Soi 'Yukina Savoy' hates drying out, so it wants a mix that stays evenly moist — but it still needs perlite so "moist" never tips into "waterlogged".
- Tat Soi 'Yukina Savoy' comes from damp, shaded forest floors and has fine roots that scorch and brown the moment the rootball dries — the mix has to hold a steady reserve.
- Coir and compost give that reserve, while perlite keeps enough air that the constantly-moist mix does not turn anaerobic.
- Even moisture also keeps its thin leaves from crisping at the edges, which is this plant’s most visible stress signal.
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 tat soi 'yukina savoy' struggles, and the damage often shows up weeks later as a watering problem. For this species specifically:
- A free-draining, gritty mix dries too fast for tat soi 'yukina savoy' — you get crispy brown edges and frond or leaf drop within days of one missed watering.
- A pure, airless peat mix swings the other way: it holds water but suffocates the fine roots and rots the crown.
- Letting the mix dry to the point it shrinks from the pot is very hard to re-wet evenly and stresses the plant badly.
Using a sharp, fast-draining "houseplant" or cactus-leaning mix that lets tat soi 'yukina savoy' dry out. It needs a moisture-retentive but still airy blend.
pH — does it matter for tat soi 'yukina savoy'?
Tat Soi 'Yukina Savoy' prefers a slightly acidic mix (around pH 5.5-6.5); a peat-free compost-and-coir blend sits there naturally, so routine pH testing is unnecessary.
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
A good peat-free houseplant compost works for tat soi 'yukina savoy' straight from the bag if you mix in some perlite for air. The DIY ratio above gives a more reliable moisture-to-air balance.
Drainage and the pot
Use a pot with a drainage hole but a less-porous material (plastic or glazed) so it does not dry too fast. Bottom-watering keeps the mix evenly moist without sogging the crown.
Peat-free mixes slump and compact as they hold moisture, so refresh tat soi 'yukina savoy''s mix every 12-18 months to keep air in the rootball even if the pot size is unchanged. When the time comes, our repotting guide for tat soi 'yukina savoy' covers the timing and technique step by step.
Tat Soi 'Yukina Savoy' soil — frequently asked questions
What is the best soil mix for tat soi 'yukina savoy'?
3 parts peat-free houseplant compost : 1 part coco coir : 1 part perlite. Tat Soi 'Yukina Savoy' comes from damp, shaded forest floors and has fine roots that scorch and brown the moment the rootball dries — the mix has to hold a steady reserve.
Can I use normal potting soil for tat soi 'yukina savoy'?
A free-draining, gritty mix dries too fast for tat soi 'yukina savoy' — you get crispy brown edges and frond or leaf drop within days of one missed watering. A good peat-free houseplant compost works for tat soi 'yukina savoy' straight from the bag if you mix in some perlite for air. The DIY ratio above gives a more reliable moisture-to-air balance.
Does tat soi 'yukina savoy' need a special pH?
Tat Soi 'Yukina Savoy' prefers a slightly acidic mix (around pH 5.5-6.5); a peat-free compost-and-coir blend sits there naturally, so routine pH testing is unnecessary.
Should I buy a bagged mix or make my own for tat soi 'yukina savoy'?
A good peat-free houseplant compost works for tat soi 'yukina savoy' straight from the bag if you mix in some perlite for air. The DIY ratio above gives a more reliable moisture-to-air balance.
How often should I refresh the soil for tat soi 'yukina savoy'?
Peat-free mixes slump and compact as they hold moisture, so refresh tat soi 'yukina savoy''s mix every 12-18 months to keep air in the rootball even if the pot size is unchanged. Use a pot with a drainage hole but a less-porous material (plastic or glazed) so it does not dry too fast. Bottom-watering keeps the mix evenly moist without sogging the crown.
Keep reading
- Tat Soi 'Yukina Savoy' care — the full brief (light, water, humidity, problems, pet safety)
- How often to water tat soi 'yukina savoy' — the schedule the mix feeds into
- Repotting tat soi 'yukina savoy' — when and how to refresh the mix
- Soil pH guide — test it and adjust it safely
- Underwatered plant — signs and how to rehydrate it
- Why is my plant wilting? Wet vs dry diagnosis
- Should I water my plant? The simple check first
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- All 5561 soil and potting-mix guides in the Growli library