Growli
Let's go

Plant care

Grisebach's Sword Plant (Narrow-leaf Sword) care

Echinodorus grisebachii

Also called Narrow-leaf Sword, Small Amazon Sword, Echinodorus parviflorus.

RHS N/AUSDA N/AToxic to petsIndoor 15-30 cm tall

Watering rhythm

Medium indirect light (a couple of metres from a window)

Submerged aquatic — 20-30% weekly water changes keep nutrients and water quality stable.

Jump to schedule→Get smart reminders in the app

Light

Medium indirect light (a couple of metres from a window)

Soil

Nutrient-rich aquarium substrate at least 5 cm deep

Humidity

N/A (submerged aquatic)

Temp

22-28°C

Pet safety

Toxic to pets

Mature size

15-30 cm tall

Care at a glance

Light

Picture the indirect light an east-facing window gives mid-morning — that's the brightness grisebach's sword plant grows fastest in. Grows well in moderate aquarium lighting (20-50 PAR). Higher light encourages more compact, vigorous growth and deeper green colouration. Low light results in pale, elongated leaves. CO2 supplementation is not required but helps. You'll know it's right when new leaves come out the same size and colour as the established ones. Smaller, paler new leaves = move closer to the window.

Watering

Aim for submerged aquatic — 20-30% weekly water changes keep nutrients and water quality stable. for grisebach's sword plant, but treat that as a starting point rather than a rule. A south-facing summer windowsill will dry the pot twice as fast as a north-facing winter room. Lift the pot; if it feels noticeably lighter than it did wet, water it. Adaptable to soft or hard water, pH 6.5-8.0. Stable tropical temperatures and low ammonia levels are more important than precise parameters. A moderate current is beneficial.

Soil and pot

Grisebach's Sword Plant grows best in nutrient-rich aquarium substrate at least 5 cm deep. Plant roots deeply in an aqua soil, laterite-enriched substrate, or plain gravel supported by root tabs. The roots are extensive and demand a deep substrate layer for best growth. A pot with a working drainage hole is non-negotiable for this species — even free-draining mix will turn soggy in a closed planter. If you love the look of a decorative pot without a hole, use it as a cachepot around an inner nursery pot you can lift out to water.

Humidity and temperature

Grisebach's Sword Plant sits happiest at around N/A (submerged aquatic) humidity and 22-28°C (72-82°F). Fully submerged in freshwater aquariums. Can be grown emersed in very humid conditions with roots in shallow water. If you keep the room above 22 year-round and avoid placing the plant near a cold draught, a hot radiator, or an air-conditioning vent, you have already handled the two biggest indoor stressors.

Fertilising

Feed grisebach's sword plant sparingly. Root tabs placed beneath the plant every 8-12 weeks are the most effective method. Liquid fertiliser supplements are also beneficial, particularly for iron and micronutrients. CO2 injection is optional. Skip fertiliser entirely on a stressed, recently-repotted, or actively wilting plant — fertiliser salts make damage worse, not better. Wait for a round of healthy new growth before resuming a feeding rhythm.

Common problems

Below are the issues we see most often on grisebach's sword plant in the Growli community. Each is annotated with the most common cause so you know where to start.

  • Yellowing leaves — Indicates iron or nutrient deficiency. Add root tabs and supplement with a liquid iron fertiliser.
  • Leaf holes or tears — Often caused by goldfish or herbivorous cichlids. Choose tank mates accordingly.
  • Outgrowing the tank — In good conditions, sword plants grow quickly and may need periodic trimming of older outer leaves.
  • Algae on older leaves — Remove heavily affected leaves and ensure adequate nutrient levels to encourage faster, healthier new growth.

Companion plants

Grisebach's Sword Plant pairs well with Vallisneria spiralis, Hygrophila polysperma, and Cryptocoryne lutea. These are species with similar light and water needs, so you can group them in the same room or on the same shelf and water as a batch.

Propagation

Produces adventitious plantlets on submerged flower stalks. Allow plantlets to develop 3-5 leaves and a root system before detaching and planting in the substrate. Can also be propagated by dividing the crown. Propagation is the cheapest, most satisfying way to expand a collection — and it doubles as insurance against losing a mature plant to an accident. Take a backup cutting once the parent is established and healthy.

Toxicity to pets

Grisebach's Sword Plant is toxic to pets. Echinodorus grisebachii is a member of the Alismataceae family, which is closely related to Araceae and shares irritant properties. As a precaution, Echinodorus species are generally considered toxic to pets if large quantities are ingested, causing gastrointestinal irritation. If you keep cats, dogs, or curious children in the house, weigh placement carefully — a high shelf or a hanging planter is enough for casual safety. For severe ingestion incidents, call your local vet and the ASPCA Animal Poison Control Center (in the US, 888-426-4435).

Pet-safety status is sourced from the ASPCA Toxic and Non-Toxic Plant List, which catalogues the most-asked-about plants for cats, dogs, and horses.

Grisebach's Sword Plant care — frequently asked questions

What is the common name for Echinodorus grisebachii?

Echinodorus grisebachii is most commonly called Grisebach's Sword Plant, but it is also known as Narrow-leaf Sword, Small Amazon Sword, Echinodorus parviflorus. The names refer to the same species, so care instructions for Grisebach's Sword Plant apply identically to anything sold as Narrow-leaf Sword.

How much light does grisebach's sword plant need?

Grisebach's Sword Plant grows best in medium indirect light (a couple of metres from a window). Grows well in moderate aquarium lighting (20-50 PAR). Higher light encourages more compact, vigorous growth and deeper green colouration. Low light results in pale, elongated leaves. CO2 supplementation is not required but helps.

How often should I water grisebach's sword plant?

Water grisebach's sword plant submerged aquatic — 20-30% weekly water changes keep nutrients and water quality stable.. Adaptable to soft or hard water, pH 6.5-8.0. Stable tropical temperatures and low ammonia levels are more important than precise parameters. A moderate current is beneficial. The finger-test (or lifting the pot to feel its weight) beats a fixed weekly calendar because pot size, light, and season all change how fast the soil dries.

Is grisebach's sword plant toxic to cats and dogs?

Grisebach's Sword Plant is toxic to pets. Echinodorus grisebachii is a member of the Alismataceae family, which is closely related to Araceae and shares irritant properties. As a precaution, Echinodorus species are generally considered toxic to pets if large quantities are ingested, causing gastrointestinal irritation.

What USDA hardiness zone does grisebach's sword plant grow in?

Grisebach's Sword Plant is rated for USDA zone N/A (aquatic, tropical) and RHS hardiness N/A. Outside that range, grow it as a container plant that overwinters indoors before the first hard frost.

Grisebach's Sword Plant deep-dive guides

Every aspect of grisebach's sword plant care, each with its own calibrated guide:

Featured in these plant shortlists

Grisebach's Sword Plant qualifies for 4 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

Related guides

Grisebach's Sword Plant is also known as Narrow-leaf Sword, Small Amazon Sword, and Echinodorus parviflorus.