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Repotting guide

When & how to repot Cavolo Nero (Brassica oleracea var. palmifolia 'Cavolo Nero')

Also called cavolo nero, black kale, Tuscan kale, dinosaur kale.

More about cavolo nero

About Cavolo Nero

Brassica oleracea var. palmifolia 'Cavolo Nero' · also called cavolo nero, black kale · edible

Cavolo nero is an Italian kale with long, narrow, deeply puckered blue-black leaves on an upright palm-like stem. Hardy and slow to bolt, it crops from late summer through winter and sweetens after frost. Grow in full sun in firm, fertile, alkaline-leaning soil, water steadily, net against cabbage pests, and pick leaves from the base.

Mature size: 60-90 cm tall, 45-60 cm spread

Watch for — Clubroot: Distorted, swollen roots and stunted, wilting plants signal this soil-borne disease in acidic, waterlogged beds. Lime the soil, improve drainage, and practise long brassica rotation.

How to tell cavolo nero needs repotting

Repotting on a calendar is less reliable than reading the plant. For cavolo nero, watch for these signs:

For the underlying biology of a pot-bound root system and why it stalls a plant, see our guide to spotting and fixing a root-bound plant.

How often to repot cavolo nero

Pot on seedlings as they grow; not a perennial repot. Cavolo Nerois grown for one season, so the question is really “how often to pot on” — keep moving it up before the roots circle. Upright, non-heading kale forming a single tall stem topped by a palm-like tuft of long, strap-shaped, blistered leaves; picked from the bottom up over a long season as the stem lengthens..

What size pot to step cavolo nero up to

Pot cavolo nero on gradually — a seedling jumped straight into a huge pot sits in cold, wet, airless soil and stalls. Step up one or two sizes at a time as the roots fill each container, finishing in a large final pot or the ground. The aim is roots that never circle and never check.

Not sure of the exact diameter? Our pot size calculator takes the current pot and root spread and tells you the right next size — it deliberately recommends a single step up, never a big jump.

The best time of year to repot cavolo nero

Pot cavolo nero on through the active growing season, whenever roots fill the current container — there is no single date, just "before it becomes root-bound". Avoid potting on during a cold snap.

Step-by-step: repotting cavolo nero

  1. Pot on before it is root-bound. Check cavolo nero regularly; move it up as soon as roots reach the edge of the cell or pot, not after they have circled.
  2. Step up one or two sizes. Choose the next container up — not a giant one. Cold, wet, unused soil around a small root system stalls seedlings.
  3. Knock it out gently. Support the stem, tip the pot, and ease the rootball out without breaking it. A little teasing of circled roots at the base is fine.
  4. Pot into rich mix. Set it into fresh firm, fertile, well-drained soil, ph 6.5-7.5 at the same depth (tomatoes are the exception — they can go deeper to root along the stem).
  5. Water in and grow on. Water well, keep it in good light, and resume feeding once it is established and growing again.

Aftercare

Water cavolo nero in well and keep it in bright light; a freshly potted-on seedling can wilt for a day while roots settle, so do not overcompensate by drowning it. Do not fertilise for about 1 week — fresh mix already carries nutrients and feeding freshly disturbed roots scorches them.

The right soil mix for cavolo nero

Cavolo Nero wants firm, fertile, well-drained soil, ph 6.5-7.5. Wants rich, firm ground on the alkaline side, like all brassicas; lime acidic soils to suppress clubroot. Dig in compost, then firm well so the tall stems resist wind-rock over winter. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting cavolo nero — frequently asked questions

How often should you repot cavolo nero?

Pot on seedlings as they grow; not a perennial repot for cavolo nero. Cavolo Nero is a seasonal crop, so you pot it on as a growing plant rather than repotting a perennial. Step seedlings up gradually into firm, fertile, well-drained soil, ph 6.5-7.5 so the roots never circle the cell, ending in a large final container. A root-bound transplant stalls and never fully recovers.

What size pot does cavolo nero need?

Pot cavolo nero on gradually — a seedling jumped straight into a huge pot sits in cold, wet, airless soil and stalls. Step up one or two sizes at a time as the roots fill each container, finishing in a large final pot or the ground. The aim is roots that never circle and never check. Use our pot size calculator to size it from the plant's current pot and root spread.

When is the best time of year to repot cavolo nero?

Pot cavolo nero on through the active growing season, whenever roots fill the current container — there is no single date, just "before it becomes root-bound". Avoid potting on during a cold snap.

Can you put cavolo nero straight into a much bigger pot?

No. Even a fast-growing cavolo nero should only go up one pot size at a time. A vastly oversized pot holds a reservoir of wet soil the roots cannot reach, which stays cold and soggy and rots the roots — the opposite of what you wanted.

Should you fertilise cavolo nero after repotting?

Not immediately. Wait about 1 week after repotting cavolo nero. Fresh mix already contains nutrients, and feeding freshly cut or disturbed roots burns them. Resume your normal feeding routine once you see new growth.

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