Zosterella Plant Care

Zosterella (Heteranthera zosterifolia) belongs to the Pontederiaceae family within the Heteranthera genus. Zosterella is native to tropical and subtropical America and Africa. Zosterella is also known as Star grass.

Zosterella displays a spreading aquatic plant growth habit, reaching up to 1 ft tall with a spread of approximately 4 ft. Zosterella produces small, delicate blue or purple flowers.

Leaf size: approximately 3 inches.

Heteranthera zosterifolia requires watering every 7–10 days. Allow the top layer of soil to dry between waterings to prevent root rot. Reduce watering frequency during winter when growth slows.

Zosterella thrives in full sun to partial shade.

Heteranthera zosterifolia grows best at temperatures of 72–82°F. Zosterella prefers humidity levels of 60–80%. A pebble tray or humidifier helps maintain adequate moisture around the plant.

Rich, loamy soil with good drainage. Good drainage is essential for Zosterella to prevent waterlogging, which leads to root rot and fungal issues.

Feed Zosterella every month during the growing season (spring and summer) with a balanced fertilizer diluted to the strength on the label.

Pause feeding in autumn and winter, when growth slows, and never fertilize dry soil — water first.

The PlantoScan app can remind you when to water and when to fertilize each plant.

Best kept in aquatic containers or ponds. Choose a pot one size larger than the current container, and ensure it has drainage holes to allow excess water to escape.

Zosterella can be propagated through division, seeds. Similar propagation techniques also apply to water star grass plant care, which shares the same genus.

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Zosterella is susceptible to aphids, spider mites. Inspect the foliage regularly, especially along leaf undersides and stems. Treat infestations promptly with insecticidal soap or neem oil to prevent spread.

Yellow leaves, brown tips or drooping? See common plant problems and how to fix them.

Zosterella grows outdoors in USDA Zone 10a – 11b. It survives winters down to planting zone 10a. Zosterella is native to tropical and subtropical America and Africa. In cooler regions, grow Zosterella as a houseplant or bring it indoors before the first frost.