Thalia Dealbata

About this plant

Thalia dealbata is a bold marginal aquatic plant with tall, long-stalked leaves and slender stems of purple flowers. It brings a tropical-looking shape to the sunny edge of a pond. Grow it in a planting basket of fertile loamy soil, with up to 15 cm of water over the soil surface. Protect the plant from freezing during winter; the foliage may die back in cooler conditions.

Growing and care

• Light: Full sun
• Mature height: 1.5–2.5 m
• Watering: Aquatic plant; keep roots wet and never allow the basket to dry out.
• Seasonal interest: Bold leaves and purple flower stems
• Hardiness / temperature: RHS H2: protect from freezing in winter
• Soil: Fertile, loamy aquatic planting soil
• Humidity: Normal outdoor humidity with good air circulation
• Feeding: Mulch or feed in spring according to growth and soil fertility
• Pruning: Remove dead, damaged or crossing growth in the appropriate season
• Potting and repotting: Container plants should be repotted when rootbound
• Safety: Species-specific toxicity has not yet been verified. Do not ingest and check before placing near children or pets.