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Fertilising guide

How to fertilise Shrimp Plant (Justicia brandegeeana)— schedule & NPK

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.

Growth habit: Lax, branching evergreen shrub with arching stems bearing overlapping brick-red to salmon bracts tipped with small white flowers.

What fertiliser shrimp plant actually wants — and why

Shrimp Plant is an easy, light foliage feeder — a half-strength balanced liquid feed through the growing months keeps it green without forcing weak, sappy growth.

A balanced general houseplant feed (roughly even N-P-K) is exactly right — it is grown for foliage, so steady, moderate nitrogen for healthy leaves is the goal, not a bloom or root formula.

For the language behind the three numbers on the bottle — what nitrogen, phosphorus and potassium each do — see the NPK ratio explained entry. The short version for shrimp plant: match the feed to the job the plant is doing right now, not to a generic “plant food” on the shelf.

How often to feed shrimp plant, and which months

Feeding only earns its keep while the plant is in active growth and can use the nutrients — pour feed into a dormant or low-light plant and it simply builds up as root-burning salt. For shrimp plant:

Apply a balanced liquid fertiliser at half strength every two to three weeks during spring and summer; withhold feed in winter. Treat that as sparingly through the growing season between spring through early autumn (roughly March to September); ease off in autumn and stop entirely in the low light of winter.

The dormant-season rule matters more than the exact interval: skip feeding entirely when shrimp plant is resting. For the wider context on indoor feeding rhythms across the seasons, the houseplant fertiliser schedule walks through the year month by month.

What strength to mix for shrimp plant

Half strength is the safe default for shrimp plant — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.

Feeding always goes onto already-damp soil, never dry roots — water shrimp plant first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the shrimp plant watering schedule.

Signs you are over-feeding shrimp plant

Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for shrimp plant:

Signs you are under-feeding shrimp plant

If the symptoms point at watering, light or roots rather than nutrition, the full shrimp plant care brief covers soil, humidity and the common problems for this species.

Flushing and leaching the salts

Flush the pot of shrimp plant with plain water until it runs freely from the base every couple of months in the feeding season — it washes out the fertiliser salts that cause brown tips.

Organic vs synthetic feeds for shrimp plant

Organic options

A diluted seaweed or worm-casting feed, or fish emulsion if you can tolerate the smell indoors. UK: Westland or Baby Bio Organic, dilute seaweed; US: Espoma Indoor! or Neptune's Harvest fish & seaweed. Slow, gentle and hard to overdo.

Synthetic / liquid feeds

A general-purpose houseplant liquid at half strength — UK: Baby Bio, Westland Houseplant Feed or Phostrogen; US: Miracle-Gro Indoor Plant Food or Schultz. Convenient and fast-acting; the only risk is overdoing it.

Brand names are examples, not endorsements, and UK and US ranges differ — check the label’s own NPK and dilution rate, since formulations change.

Fertilising shrimp plant — frequently asked questions

What fertiliser does shrimp plant need?

A balanced general houseplant feed (roughly even N-P-K) is exactly right — it is grown for foliage, so steady, moderate nitrogen for healthy leaves is the goal, not a bloom or root formula. Shrimp Plant is an easy, light foliage feeder — a half-strength balanced liquid feed through the growing months keeps it green without forcing weak, sappy growth.

How often should I feed shrimp plant?

Apply a balanced liquid fertiliser at half strength every two to three weeks during spring and summer; withhold feed in winter. Apply a balanced liquid fertiliser at half strength every two to three weeks during spring and summer; withhold feed in winter. Treat that as sparingly through the growing season between spring through early autumn (roughly March to September); ease off in autumn and stop entirely in the low light of winter.

What strength of feed for shrimp plant?

Half strength is the safe default for shrimp plant — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.

What does over-feeding shrimp plant look like?

Brown, crispy leaf tips and edges with no sign of underwatering. A white, crusty salt deposit on the soil surface or pot rim. Weak, pale, stretched new growth that flops. Lower leaves yellow and drop while the soil is correctly watered. Feeding shrimp plant year-round on a fixed schedule, including dark winter months, is the most common mistake — it cannot use the nutrients in low light and the surplus simply burns the roots and crusts the soil.

Should I flush the soil of shrimp plant?

Flush the pot of shrimp plant with plain water until it runs freely from the base every couple of months in the feeding season — it washes out the fertiliser salts that cause brown tips.

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