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Pogostemon stellatus
Pogostemon stellatus
Care level: Hard
Pogostemon stellatus is a stem plant from Asia and Australia with narrow leaves set in star-shaped whorls, each whorl up to 10cm across. Under strong light the shoot tips take on purple and reddish tones, which makes a healthy group one of the most striking sights in a planted tank. It is also one of the hardest stem plants to keep: it needs intense light, added CO2 and a steady, balanced supply of nutrients, and it shows quickly when any of them is missing.
Intense aquarium lighting. In weak light it thins out and stays green.
Water
Freshwater with added CO2 and stable conditions. It reacts badly to sudden changes.
CO2 & Feeding
Not applicable; this is a fully submerged aquarium plant.
Substrate
A nutrient-rich planted substrate, backed up by regular liquid fertiliser.
Size
Stems 20-60cm long and up to 10cm wide.
Growth speed
Medium
Tank Placement
Background
Common mistake
Putting this plant in a low-tech tank is the usual mistake. Without intense light and added CO2 it does not merely grow slowly, it declines. Choose it only for a tank that already runs strong lighting, CO2 and regular fertilising.
Care by Season
Spring
No seasonal rhythm in a heated tank; growth depends on light, CO2 and nutrients.
Summer
Keep conditions steady in hot weather; a tank that overheats or runs short of CO2 can stop the plant.
Autumn
No seasonal change indoors; carry on as usual.
Winter
No seasonal change in a heated tank.
Growing & Maintenance
Planting
Plant single stems a few centimetres apart in a nutrient-rich substrate, in the background or middle of the tank, under strong light.
Fertilising
Dose a complete liquid fertiliser regularly, including iron and other micronutrients, and keep the CO2 supply steady.
Trimming
Trim the tops when the stems near the surface, a few stems at a time rather than the whole group.
Propagation
Replant cut tops as cuttings, and take side shoots from trimmed stems.
Pests & Diseases
Common problems
Small, stunted shoot tips
Most likely cause: A growth stop, set off by a drop in CO2, a nutrient shortage or a sudden change.
What to do: Restore stable conditions and cut off the stunted tips so that side shoots can take over.
Pale new leaves
Most likely cause: A lack of micronutrients, mainly iron.
What to do: Dose a complete fertiliser regularly.
Green, thin growth with no colour
Most likely cause: Light that is too weak.
What to do: Increase the light, and the CO2 and nutrients with it.
Lower leaves dropping
Most likely cause: The stems shade one another.
What to do: Plant the stems further apart and thin the group.
Stems melting from the base
Most likely cause: Conditions the plant cannot cope with, usually too little light and CO2.
What to do: Save healthy tops as cuttings and improve the conditions before replanting.
Pests & Diseases
Algae on the leaves
Signs: Green or dark tufts on the leaf edges and older whorls, often after growth has slowed.
Treatment: Remove the worst leaves, check the CO2 and nutrient supply, and keep algae-eating shrimp or snails to clean new growth.
Leaf drop after planting
Signs: A new plant sheds leaves in its first weeks in the tank.
Treatment: Nursery plants are often grown above water and replace those leaves with underwater ones. Leave the stems in place and remove what dies.
FAQ
Why has my Pogostemon stellatus stopped growing?
This species is known for stopping abruptly, with small, stunted shoot tips, sometimes even when conditions look good. The usual triggers are a drop in CO2, a shortage of nutrients or a sudden change in the tank. Restore stable conditions, trim off stunted tips and give it time; side shoots usually take over.
Does it need CO2?
Yes. It needs intense light and added CO2 to grow well, and it will not hold its shape or colour without them.
Why are the new leaves pale?
Pale shoot tips point to a lack of micronutrients, iron in particular. Dose a complete fertiliser regularly, as this plant reacts to shortages sooner than most.
How do I get the purple colour?
Strong light is the main factor, together with a balanced supply of nutrients. In weaker light the plant stays green and grows thinner.
How do I trim and propagate it?
Cut the stem tops and replant them as cuttings; the lower part sends out side shoots. Avoid cutting the whole group back hard at once, which can set off a growth stop.
Where does it go in the tank?
In the background or as a group in the middle of a large tank, with space around it. The whorls are wide, so stems planted too close together shade one another.
