Echinodorus parviflora tropica

The dark one. Where most swords are a pleasant mid-green, 'Tropica' grows deep, almost black-green leaves with heavily sunken veins running their length, giving the whole plant a quilted, hammered texture. New leaves push out reddish-brown before darkening down. In a tank full of light green foliage it reads as a shadow — which is exactly what a planted layout usually needs and rarely has.

It is also compact by sword standards. This is a cultivar of Echinodorus parviflorus selected for a tight, low rosette rather than the sprawling mass of a full-sized Amazon sword, which makes it usable in tanks where an 'Ozelot' would take over. Slow-growing, undemanding, no CO₂, and entirely comfortable in hard Indian tap water.

Care Snapshot

Scientific name	Echinodorus parviflorus 'Tropica'
Also known as	Tropica Sword, Black Amazon Sword
Family	Alismataceae
Origin	Nursery cultivar; the species is South American
Plant type	Rosette, heavy root system
Placement	Mid-ground specimen; background in small tanks
Size	Roughly 15–25 cm tall and 15–20 cm across
Growth rate	Slow — very little maintenance
Lighting	Low to medium; stronger light deepens the colour
CO2	Not required
Temperature	22–29 °C
pH	6.0–8.0 — wide tolerance
Hardness	Soft to hard — handles Indian tap water well
Substrate	Fine sand or gravel, 5 cm+ deep
Fertilisation	Root tabs essential in inert substrate
Difficulty	Easy — beginner-suitable with root feeding

Which Sword Do You Actually Want?

All three grow on the same terms — no CO₂, root tabs, hard water fine. They differ in size and in what they do visually.

'Tropica' this plant	15–25 cm. Dark, heavily veined, quilted leaves. The compact one, and the one that adds depth and shadow. Best mid-ground specimen for a 60–90 cm tank.
'Vesuvius'	15–25 cm. Narrow leaves twisted into tight corkscrews. Chosen for shape rather than colour. Works in smaller tanks.
'Ozelot'	25–40 cm and 25–30 cm across. Red-brown spotted leaves, red new growth. The big background statement plant — needs a 90 litre tank or larger.

Planting It

• Bury the roots, keep the crown clear. The point where leaves emerge must sit at the substrate surface. A buried crown rots — the one planting mistake that actually kills a sword.
• Give it depth. At least 5 cm of substrate. Far more of this plant sits below the surface than above it.
• Put it against a light background. The dark foliage is the whole point and it disappears against black backing or dark hardscape. Against pale sand, wood or a light background it does real work.
• Leave 15–20 cm of clear space around it. Compact for a sword still means substantial by the standards of most plants.
• Decide the position before planting. Swords resent being lifted and sulk for weeks afterwards.
• Emersed-grown stock will convert. Nursery plants raised out of water shed their original leaves and regrow submersed ones, which are darker and better textured. Expect a transition period rather than instant results.

Getting The Colour And Texture

New leaves emerge reddish-brown and darken to deep green over several weeks, so a healthy plant always shows a gradient from warm new growth at the centre to near-black mature leaves outside. Stronger light produces a shorter plant with deeper colour and more pronounced vein texture; low light gives longer, flatter, plainer mid-green leaves. Both are healthy, but if the dark quilted look is what you bought, more light and a fed root zone is how to get it. New growth that does not match the leaves it arrived with is normal — those leaves were grown for your tank, not the nursery's.

Propagation

Swords throw a long flower stalk or runner carrying daughter plantlets that develop their own leaves and roots while still attached to the parent. Leave each plantlet in place until it has four or five leaves and visible roots, then cut it free and plant it with the crown clear of the substrate. A well-fed plant does this on its own. Dividing the rhizome of a mature specimen is possible but sets the parent back badly, so take plantlets instead.

What It Pairs With

Shrimp-safe and snail-safe, with tough leaves that stand up to Corydoras, loaches and most community fish working around the base, including Angelfish and peaceful cichlids that would shred softer plants. The dark quilted foliage contrasts particularly well with the fresh green of Cryptocoryne wendtii 'Green' or a Pygmy Chain Sword carpet — one dark anchor among lighter foliage is usually all a low-tech layout needs. Goldfish and large aggressive cichlids will still uproot or eat it.

Growing It In Indian Conditions

• Hard, alkaline tap water suits it. No RO, no buffering, no CO₂. Swords are among the small group of genuinely attractive plants that will simply grow in an ordinary Indian tank.
• Summer is survivable. Comfortable to around 29 °C. Growth slows in peak heat but the plant holds its form rather than collapsing the way fine-leaved stems do.
• No heater needed anywhere in India for most of the year.
• Root tabs are a required purchase. Most Indian tanks run plain river sand or gravel, which is precisely the situation in which a sword starves slowly over months. Budget for tabs from the outset rather than after the plant declines.