Repotting guide

When & how to repot Raceme catmint (Nepeta racemosa)

Also called Raceme catmint, Dwarf catmint.

More about raceme catmint

About Raceme catmint

Nepeta racemosa · also called Raceme catmint, Dwarf catmint · herb

A compact, aromatic perennial producing a profusion of small violet-blue flower spikes over grey-green foliage from late spring through summer, with a strong rebloom after cutting back. Highly drought-tolerant once established. Pet-safe and attractive to bees, butterflies, and cats. Ideal for sunny borders, edging, and gravel gardens.

Mature size: 30–45 cm tall, 45–60 cm wide

Watch for — Leggy or sprawling growth: In rich soil or partial shade, stems sprawl and flop. Shear plants by about half immediately after the first flush of flowers (usually late June–July) to promote a tight, compact second flush of growth and blooms.

How to tell raceme catmint needs repotting

Repotting on a calendar is less reliable than reading the plant. For raceme catmint, 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 raceme catmint 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 raceme catmint

Pot on seedlings as they grow; not a perennial repot. Raceme catmintis grown for one season, so the question is really “how often to pot on” — keep moving it up before the roots circle. Low, mounding to spreading herbaceous perennial with aromatic, softly hairy, grey-green ovate leaves and upright racemes of two-lipped, violet-blue flowers from May to August. Shears back to a tighter mound after flowering..

What size pot to step raceme catmint up to

Pot raceme catmint 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 raceme catmint

Pot raceme catmint 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 raceme catmint

Pot on before it is root-bound. Check raceme catmint 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 well-drained, lean to moderately fertile loam, chalk, or sandy soil 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 raceme catmint 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 raceme catmint

Raceme catmint wants well-drained, lean to moderately fertile loam, chalk, or sandy soil. Performs best in free-draining, moderately fertile soil. Overly rich or moist soil causes lax, sprawling growth and reduces drought tolerance. Good drainage is essential, especially in winter. pH 6.0–7.5 is ideal. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting raceme catmint — frequently asked questions

How often should you repot raceme catmint?

Pot on seedlings as they grow; not a perennial repot for raceme catmint. Raceme catmint is a seasonal crop, so you pot it on as a growing plant rather than repotting a perennial. Step seedlings up gradually into well-drained, lean to moderately fertile loam, chalk, or sandy soil 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 raceme catmint need?

When is the best time of year to repot raceme catmint?

Can you put raceme catmint straight into a much bigger pot?

No. Even a fast-growing raceme catmint 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 raceme catmint after repotting?

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