Repotting guide

When & how to repot Autumn King Carrot (Daucus carota subsp. sativus 'Autumn King')

Also called Autumn King carrot, long carrot.

More about autumn king carrot

About Autumn King Carrot

Daucus carota subsp. sativus 'Autumn King' · also called Autumn King carrot, long carrot · edible

'Autumn King' is a large, vigorous maincrop carrot producing long, broad, deep-orange roots that hold their quality late into the season and stand well in the ground for winter lifting. It needs deep, light soil to reach full length. A cool-season biennial grown as an annual, it matures in roughly 110-120 days — slower but heavy-yielding and good for storage.

Mature size: Roots 20-30 cm long and broad-shouldered; foliage 35-45 cm tall.

Watch for — Carrot root fly: The long maincrop roots are in the ground for months, giving the fly time to do real damage. Use insect mesh or 60 cm barriers and lift on time.

How to tell autumn king carrot needs repotting

Repotting on a calendar is less reliable than reading the plant. For autumn king carrot, 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 autumn king carrot 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 autumn king carrot

Pot on seedlings as they grow; not a perennial repot. Autumn King Carrotis grown for one season, so the question is really “how often to pot on” — keep moving it up before the roots circle. Robust ferny foliage above a long, stout, gently tapering taproot — the largest of these carrot types..

What size pot to step autumn king carrot up to

Pot autumn king carrot 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 autumn king carrot

Pot autumn king carrot 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 autumn king carrot

Pot on before it is root-bound. Check autumn king carrot 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 deep, light, stone-free sandy loam 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 autumn king carrot 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 autumn king carrot

Autumn King Carrot wants deep, light, stone-free sandy loam. Fine, low-fertility, well-drained soil, pH 6.0-6.8, dug deeply so the long roots can extend without obstruction. Avoid stones and fresh manure that cause forking. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting autumn king carrot — frequently asked questions

How often should you repot autumn king carrot?

Pot on seedlings as they grow; not a perennial repot for autumn king carrot. Autumn King Carrot is a seasonal crop, so you pot it on as a growing plant rather than repotting a perennial. Step seedlings up gradually into deep, light, stone-free sandy loam 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 autumn king carrot need?

When is the best time of year to repot autumn king carrot?

Can you put autumn king carrot straight into a much bigger pot?

No. Even a fast-growing autumn king carrot 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 autumn king carrot after repotting?

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