Repotting guide

When & how to repot Shrimp Plant (Justicia brandegeeana)

Also called Shrimp Plant, Mexican Shrimp Plant, Shrimp Bush, False Hop.

More about shrimp plant

About Shrimp Plant

Justicia brandegeeana · also called Shrimp Plant, Mexican Shrimp Plant · tropical

Native to Mexico, Justicia brandegeeana is an evergreen shrub grown for its arching chains of overlapping salmon-pink bracts that closely resemble a shrimp, which persist almost year-round when given adequate light. It thrives in bright indirect light with evenly moist, well-drained soil and performs best when pinched back regularly to prevent legginess. The most important care fact is that it will bloom most prolifically and maintain compact growth when given high light and pruned after each flowering flush. According to the ASPCA, Justicia brandegeeana is considered non-toxic to cats and dogs.

Mature size: 60–90 cm (24–36 in) tall and wide in a container; up to 1.2 m (4 ft) outdoors in frost-free climates.

Watch for — Leggy, non-blooming stems: Insufficient light causes long, weak stems with few bracts; pinch out shoot tips regularly and move the plant to a brighter position to restore a compact, free-flowering habit.

How to tell shrimp plant needs repotting

Repotting on a calendar is less reliable than reading the plant. For shrimp plant, watch for these signs:

Roots poking out of the drainage holes or coiling visibly around the inside of the pot.
You are watering far more often than you used to because the rootball dries out within a day or two.
Water runs straight through and out the bottom without soaking in.
Top growth has slowed or new shrimp plant leaves are noticeably smaller than older ones despite good light.

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 shrimp plant

Every 12–18 months — sooner if roots show fast. Shrimp Plant's growth habit — lax, branching evergreen shrub with arching stems bearing overlapping brick-red to salmon bracts tipped with small white flowers. — sets the pace. Native to Mexico, Justicia brandegeeana is an evergreen shrub grown for its arching chains of overlapping salmon-pink bracts that closely resemble a shrimp, which persist almost year-round when given adequate light. It thrives in bright indirect light with evenly moist, well-drained soil and performs best when pinched back regularly to prevent legginess. The most important care fact is that it will bloom most prolifically and maintain compact growth when given high light and pruned after each flowering flush. According to the ASPCA, Justicia brandegeeana is considered non-toxic to cats and dogs.

What size pot to step shrimp plant up to

Step up one pot size — about 2–3 cm (an inch) wider. Shrimp Plant grows fast, so it will fill that space within a season, but jumping several sizes at once still backfires: the unused soil stays soggy and rots even a vigorous root system. One size at a time, every year or so, is the rhythm.

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 shrimp plant

Early spring, just as new growth restarts, is the ideal window for shrimp plant. The plant is moving into its strongest growth phase and re-roots into fresh soil quickly. Avoid repotting in winter dormancy or, for flowering plants, while it is in bud or bloom — recovery is slowest then and you risk dropping the flowers.

Step-by-step: repotting shrimp plant

Time it for spring. Repot shrimp plant in early spring as growth restarts so it re-roots quickly into the fresh soil.
Choose one size up. Pick a pot about 2–3 cm wider with drainage holes. One step only — a much bigger pot stays soggy and rots roots.
Ease the plant out. Water lightly the day before, then tip shrimp plant out and gently loosen any roots circling the bottom of the rootball.
Repot at the same depth. Put a layer of fresh well-drained loam-based or peat-free multi-purpose compost in the new pot, set the plant so its soil line is unchanged, and backfill, firming lightly.
Water and pause feeding. Water once to settle the soil. Hold off fertiliser for about a month — fresh mix already has nutrients and feeding now burns new roots.

Aftercare

Water shrimp plant once to settle the soil, then let the surface dry before watering again — fresh mix around the roots stays wetter than the old compacted ball, so the commonest post-repot mistake is overwatering. Keep it out of direct sun for a week or two while roots re-establish. Do not fertilise for about 4 weeks — fresh mix already carries nutrients and feeding freshly disturbed roots scorches them.

The right soil mix for shrimp plant

Shrimp Plant wants well-drained loam-based or peat-free multi-purpose compost. A loam-based mix (e.g. John Innes No. 2) with added perlite improves drainage and suits both pot and border cultivation. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting shrimp plant — frequently asked questions

How often should you repot shrimp plant?

Every 12–18 months — sooner if roots show fast for shrimp plant. Repot shrimp plant roughly every 12–18 months, in early spring as growth restarts. It grows fast and circles its pot quickly, so step up one size (about 2–3 cm wider) into fresh well-drained loam-based or peat-free multi-purpose compost. Don't jump several sizes — that soggy excess soil is what rots vigorous roots.

What size pot does shrimp plant need?

When is the best time of year to repot shrimp plant?

Can you put shrimp plant straight into a much bigger pot?

No. Even a fast-growing shrimp plant 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 shrimp plant after repotting?

Not immediately. Wait about 4 weeks after repotting shrimp plant. Fresh mix already contains nutrients, and feeding freshly cut or disturbed roots burns them. Resume your normal feeding routine once you see new growth.