Pogostemon erectus

Quick facts

Max height

40 cm

Growth rate

moderate

Difficulty

intermediate

Placement

midground, background

Propagation

stem cuttings

Water parameters

Temperature

20–28°C

pH

6.0 to 7.5

Hardness

2 to 15 dGH

Light and nutrients

Lighting

medium

CO2

not required, but boosts growth and color

Substrate

any

Feeding

feeds from both water column and roots (liquid ferts plus root tabs)

Substrate

What this plant roots into (or attaches to). The substrate affects both plant nutrition and water chemistry; see each linked page for full effects.

This plant feeds primarily from the water column, so substrate choice matters more for its fish-tank compatibility than for plant nutrition.

With fish

Plant-eating fish

safe with plant-eating fish (tough leaves or unpalatable)

Diggers (corydoras, loaches)

fine - root system or attachment style handles it

Root-disturbing fish

sensitive to root disturbance, plant where roots stay undisturbed

Habitat

Native to India, found growing in marshes, ditches, and shallow water in the Western Ghats and surrounding lowlands. The species (Pogostemon erectus) is an upright stem plant with dense whorls of fine, needle-like leaves arranged along a straight, vertical stem. The conifer-like appearance (it resembles a miniature cypress or pine tree) is distinctive and unlike any other common aquarium stem plant. Under good conditions, the bright green, densely packed leaf whorls create a striking vertical accent. Introduced to the aquascaping hobby in the 2000s from Indian collections, it has become popular for its unique vertical texture. The genus Pogostemon includes many terrestrial species, some used as herbs (P. cablin is the source of patchouli oil). Only a few species in the genus are suited to fully submerged aquatic growth. P. erectus is the most commonly available aquatic Pogostemon alongside P. helferi (downoi) and P. stellatus (octopus plant).

Care notes

Moderate care. Requires moderate to high light for the dense, compact growth that makes the plant attractive. Under low light, the lower leaf whorls shed and the stem becomes bare and leggy. CO2 injection is recommended: with CO2 at 20-30 ppm, growth is steady and the leaf whorls stay tight and green. Without CO2, growth is slower and the lower portions thin out more quickly. Plant stems individually or in small groups of 3-5, spaced 3–5 cm apart so each stem has room for its whorls. Trim tops to maintain height; the cut stems produce side shoots but less reliably than easier stem plants. Rich substrate and regular fertilization (especially nitrogen and iron) support the dense leaf production. Temperature: 22–28°C. pH 6.0-7.5. Soft to moderately hard water. The vertical, conifer-like growth pattern creates a unique textural element in aquascapes, providing visual contrast against rounded-leaf plants and flowing mosses. Best used as a midground accent or a narrow background column. Available from specialty aquatic plant retailers, typically as tissue culture.

Further reading

• How to cycle a fish tank
• Water chemistry for fishkeepers: pH, GH, KH, and what they mean