Marsh Sowthistle Plant Care

Marsh Sowthistle (Sonchus palustris) belongs to the Asteraceae family within the Sonchus genus. Marsh Sowthistle is native to temperate regions of the Europe, Russia, Central Asia, and Xinjiang in western China. Marsh Sowthistle is also known as Field Sowthistle, Hieracium palustre, Sonchidium palustre.

Marsh Sowthistle displays an upright, branching herbaceous plant growth habit, reaching up to 3 ft tall with a spread of approximately 2 ft. Marsh Sowthistle produces small yellow daisy-like flowers in clusters.

Leaf size: approximately 6 inches.

Sonchus palustris requires watering every 4–7 days. Allow the top layer of soil to dry between waterings to prevent root rot. Reduce watering frequency during winter when growth slows.

Marsh Sowthistle thrives in full sun to partial shade.

Sonchus palustris grows best at temperatures of 50–80°F. Marsh Sowthistle prefers humidity levels of 40–70%.

Well-draining, fertile soil with added compost or organic matter. Good drainage is essential for Marsh Sowthistle to prevent waterlogging, which leads to root rot and fungal issues.

Feed Marsh Sowthistle every 6 months 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.

Repot every 1-2 years in early spring. Choose a pot one size larger than the current container, and ensure it has drainage holes to allow excess water to escape.

Marsh Sowthistle can be propagated through seeds, division of root ball. Similar propagation techniques also apply to species plantarum plant care, which shares the same genus.

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Marsh Sowthistle is susceptible to aphids, caterpillars, slugs. 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.

Marsh Sowthistle grows outdoors in USDA Zone 5a – 9b. It survives winters down to planting zone 5a. Marsh Sowthistle is native to temperate regions of the Europe, Russia, Central Asia, and Xinjiang in western China.