Soil & potting mix
Best soil for Turnip 'Purple Top White Globe' (Brassica rapa var. rapa 'Purple Top White Globe')
Also called Purple Top White Globe turnip, garden turnip.
More about turnip 'purple top white globe'
About Turnip 'Purple Top White Globe'
Brassica rapa var. rapa 'Purple Top White Globe' · also called Purple Top White Globe turnip, garden turnip · edible
'Purple Top White Globe' is the classic heirloom turnip with smooth white roots flushed bright purple at the shoulder. Fast and reliable, roots reach 8-12 cm and mature in about 50-55 days, sweetening after frost. Both the root and the nutritious greens are eaten. Sow direct in full sun in cool spring or autumn weather.
Preferred mix: Fertile, moisture-retentive, free-draining loam
Watch for — Clubroot: Brassica root disease causing swollen, distorted roots and wilting; lime soil to raise pH, improve drainage and rotate brassicas on a 3-4 year cycle.
Why turnip 'purple top white globe' needs this mix
Turnip 'Purple Top White Globe' hates drying out, so it wants a mix that stays evenly moist — but it still needs perlite so "moist" never tips into "waterlogged".
- Turnip 'Purple Top White Globe' 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 turnip 'purple top white globe' 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 turnip 'purple top white globe' — 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 turnip 'purple top white globe' dry out. It needs a moisture-retentive but still airy blend.
pH — does it matter for turnip 'purple top white globe'?
Turnip 'Purple Top White Globe' 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 turnip 'purple top white globe' 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 turnip 'purple top white globe''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 turnip 'purple top white globe' covers the timing and technique step by step.
Turnip 'Purple Top White Globe' soil — frequently asked questions
What is the best soil mix for turnip 'purple top white globe'?
3 parts peat-free houseplant compost : 1 part coco coir : 1 part perlite. Turnip 'Purple Top White Globe' 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 turnip 'purple top white globe'?
A free-draining, gritty mix dries too fast for turnip 'purple top white globe' — you get crispy brown edges and frond or leaf drop within days of one missed watering. A good peat-free houseplant compost works for turnip 'purple top white globe' 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 turnip 'purple top white globe' need a special pH?
Turnip 'Purple Top White Globe' 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 turnip 'purple top white globe'?
A good peat-free houseplant compost works for turnip 'purple top white globe' 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 turnip 'purple top white globe'?
Peat-free mixes slump and compact as they hold moisture, so refresh turnip 'purple top white globe''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
- Turnip 'Purple Top White Globe' care — the full brief (light, water, humidity, problems, pet safety)
- How often to water turnip 'purple top white globe' — the schedule the mix feeds into
- Repotting turnip 'purple top white globe' — 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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