Repotting guide

When & how to repot Slow-bolt Cilantro (Coriandrum sativum 'Slow Bolt')

Also called Slow-bolt Cilantro, Coriander, Chinese Parsley.

More about slow-bolt cilantro

About Slow-bolt Cilantro

Coriandrum sativum 'Slow Bolt' · also called Slow-bolt Cilantro, Coriander · herb

A cool-season annual herb bred to delay flowering, giving growers significantly more time to harvest aromatic leaves before the plant sets seed. Thrives in full sun to partial shade in well-drained, fertile soil. Succession-sow every 2–3 weeks for a continuous supply. Bolt-resistance makes it ideal for warmer springs.

Mature size: 30–60 cm tall (12–24 in), 15–20 cm spread (6–8 in)

How to tell slow-bolt cilantro needs repotting

Repotting on a calendar is less reliable than reading the plant. For slow-bolt cilantro, 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 slow-bolt cilantro 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 slow-bolt cilantro

Pot on seedlings as they grow; not a perennial repot. Slow-bolt Cilantrois grown for one season, so the question is really “how often to pot on” — keep moving it up before the roots circle. Upright annual; rosette of broad, lobed lower leaves maturing to feathery, pinnate upper leaves.

What size pot to step slow-bolt cilantro up to

Pot slow-bolt cilantro 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 slow-bolt cilantro

Pot slow-bolt cilantro 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 slow-bolt cilantro

Pot on before it is root-bound. Check slow-bolt cilantro 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 fertile, well-draining loam or sandy loam, ph 6.2–6.8 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 slow-bolt cilantro 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 slow-bolt cilantro

Slow-bolt Cilantro wants fertile, well-draining loam or sandy loam, ph 6.2–6.8. Enrich with compost before sowing. Avoid heavy clay that stays wet, which promotes root rot. Good drainage is essential, whether in ground or containers. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting slow-bolt cilantro — frequently asked questions

How often should you repot slow-bolt cilantro?

Pot on seedlings as they grow; not a perennial repot for slow-bolt cilantro. Slow-bolt Cilantro is a seasonal crop, so you pot it on as a growing plant rather than repotting a perennial. Step seedlings up gradually into fertile, well-draining loam or sandy loam, ph 6.2–6.8 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 slow-bolt cilantro need?

When is the best time of year to repot slow-bolt cilantro?

Can you put slow-bolt cilantro straight into a much bigger pot?

No. Even a fast-growing slow-bolt cilantro 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 slow-bolt cilantro after repotting?

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