Water Star
Pogostemon stellatus
Lamiaceae
About
Pogostemon stellatus is a tall marsh stem plant from East and Southeast Asia and northern Australia, whose slender stems carry dense whorls of very narrow leaves; a well-fed shoot spreads 6-14 cm across and looks like a stack of green and pink stars. Stems run from 20 cm to about 60 cm, so a trimmed group belongs at the back of a larger tank, where it makes one of the most striking bushes in the hobby. Colour is a nutrient readout: strong light with lean nitrate and phosphate pushes the tops purple to orange, high nitrate and phosphate turn them plain green, and a shortage of iron or trace elements bleaches the new leaves yellow or white. Several trade forms circulate - the fine-leaved standard plant, the wider 'Broad Leaf' and the orange-pink 'Dassen' - while plants sold as 'Octopus' are usually the related Pogostemon quadrifolius, not this species.
Care
Genuinely demanding, and mis-sold as easy. It needs high light, pressurised CO2, a permanently dosed water column (nitrate, phosphate, potassium, iron and traces) over nutrient-rich substrate, and 24-28 C soft to moderately hard water. Even in good tanks growth stalls now and then, and after replanting or any sudden change in light, CO2 or dosing the leading tip can cripple and throw side shoots instead. Space the stems so light reaches the lower whorls, keep parameters boringly stable, and top-and-replant rather than letting the base go bare. Not a plant for a first low-tech tank.
Frequently asked questions
- What water parameters does a Water Star need?
- Water Star does best at 15–32 °C (59–89.6 °F), pH 5–7.5 and a general hardness of 2–12 °dGH.
- Where should Water Star be placed in the aquarium?
- Water Star works best at the back of the tank and reaches around 60 cm.
- Is the Water Star suitable for beginners?
- Water Star is a demanding species best attempted with some experience — it needs stable, closely watched conditions to thrive.