Repotting guide

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

Also called Lacinato kale, Tuscan kale, Dinosaur kale, Black kale.

More about 'cavolo nero' kale

About 'Cavolo Nero' Kale

Brassica oleracea var. palmifolia 'Nero di Toscana' · also called Lacinato kale, Tuscan kale · edible

Cavolo nero is the Tuscan 'black' kale prized for its long, strappy, blue-black blistered leaves and deep, sweet flavour after frost. Exceptionally hardy and easy, it crops over a long cool season from late summer into winter. Grow in full sun and firm, fertile soil, picking leaves from the bottom up so the plant keeps producing for months.

Mature size: 60-90 cm tall and 45-60 cm wide

How to tell 'cavolo nero' kale needs repotting

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

Roots circling the bottom of the module or pot, or poking out of the drainage holes.
The seedling dries out within a day and growth has visibly stalled.
Roots are white and matted in a tight spiral when you tip the plant out.
It has outgrown its current container for the stage of the season — pot 'cavolo nero' kale on before it becomes hard root-bound.

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' kale

Pot on seedlings as they grow; not a perennial repot. 'Cavolo Nero' Kaleis grown for one season, so the question is really “how often to pot on” — keep moving it up before the roots circle. Upright, columnar, non-heading kale forming a tall central stem topped with a rosette of long, narrow, heavily savoyed leaves; develops a palm-like 'tree' silhouette as lower leaves are picked..

What size pot to step 'cavolo nero' kale up to

Pot 'cavolo nero' kale 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' kale

Pot 'cavolo nero' kale 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' kale

Pot on before it is root-bound. Check 'cavolo nero' kale regularly; move it up as soon as roots reach the edge of the cell or pot, not after they have circled.
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.
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.
Pot into rich mix. Set it into fresh firm, fertile, well-drained loam, ph 6.5-7.5 at the same depth (tomatoes are the exception — they can go deeper to root along the stem).
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' kale 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' kale

'Cavolo Nero' Kale wants firm, fertile, well-drained loam, ph 6.5-7.5. Thrives in rich, moisture-retentive ground enriched with compost or well-rotted manure. Firm the soil before planting so tall plants do not rock. Near-neutral pH helps suppress clubroot. 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' kale — frequently asked questions

How often should you repot 'cavolo nero' kale?

Pot on seedlings as they grow; not a perennial repot for 'cavolo nero' kale. 'Cavolo Nero' Kale 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 loam, 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' kale need?

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

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

No. Even a fast-growing 'cavolo nero' kale 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' kale after repotting?

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