Repotting guide

When & how to repot Calabrese Broccoli (Brassica oleracea var. italica 'Calabrese')

Also called calabrese, green broccoli, Italian broccoli.

More about calabrese broccoli

About Calabrese Broccoli

Brassica oleracea var. italica 'Calabrese' · also called calabrese, green broccoli · edible

Calabrese is the familiar green broccoli, grown for a large central blue-green head followed by smaller side shoots. A fast summer-to-autumn brassica, it needs full sun, firm fertile soil and steady moisture, and resents transplant check. Cut the central head before the buds open, then keep picking the side shoots for several weeks.

Mature size: 45-60 cm tall, 45-60 cm spread; central head 10-20 cm across

Watch for — Premature buttoning: Tiny, useless heads form early when seedlings are stressed by cold, drought, or root-bound transplant check. Grow plants on without checks, harden off carefully, and keep moisture and feeding steady.

How to tell calabrese broccoli needs repotting

Repotting on a calendar is less reliable than reading the plant. For calabrese broccoli, 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 calabrese broccoli 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 calabrese broccoli

Pot on seedlings as they grow; not a perennial repot. Calabrese Broccoliis grown for one season, so the question is really “how often to pot on” — keep moving it up before the roots circle. Annual brassica grown for immature flower buds; an upright plant producing one large central dome of green buds, then a flush of smaller side-shoot heads after the main head is cut..

What size pot to step calabrese broccoli up to

Pot calabrese broccoli 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 calabrese broccoli

Pot calabrese broccoli 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 calabrese broccoli

Pot on before it is root-bound. Check calabrese broccoli 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 soil, 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 calabrese broccoli 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 calabrese broccoli

Calabrese Broccoli 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 deter clubroot. Plenty of organic matter and firm planting support steady growth and prevent the wind-rock that causes early heading. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting calabrese broccoli — frequently asked questions

How often should you repot calabrese broccoli?

Pot on seedlings as they grow; not a perennial repot for calabrese broccoli. Calabrese Broccoli 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 calabrese broccoli need?

When is the best time of year to repot calabrese broccoli?

Can you put calabrese broccoli straight into a much bigger pot?

No. Even a fast-growing calabrese broccoli 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 calabrese broccoli after repotting?

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