Growing Zones
USDA Hardiness Zones
10These zones indicate the coldest temperatures this plant can typically survive.
What's my zone? →Frost Tolerancetender
Key Features
Maintenancemoderate
Overview
Aponogeton natans is an aquatic perennial in the Aponogetonaceae family, growing from a tuberous rootstock anchored in the bottom substrate of still or slow-moving freshwater. Leaves are floating, oblong-elliptic, 2–6 inches (5–15 cm) long and 0.75–2 inches (2–5 cm) wide, bright green, with a smooth surface and parallel venation characteristic of the genus. Petioles extend from the submerged tuber to the water surface, adjusting in length to the water depth — typically 12–24 inches (30–60 cm). The inflorescence is a single-forked spike (bifid in some populations) that emerges 1–2 inches (2.5–5 cm) above the water surface, bearing small, white, fragrant flowers arranged in a dense cluster along one side of the spike. Fragrance is sweet, vanilla-like, most noticeable on warm days. The species is native to tropical and subtropical Asia, where it grows in ponds, slow rivers, rice paddies, and seasonal pools. Unlike the more commonly cultivated A. distachyos (water hawthorn) from South Africa, A. natans is less cold-hardy and requires water temperatures above 60°F (15°C) for active growth. Tubers go dormant when water temperature drops below 55°F (13°C). In the Pacific Northwest, it is grown as a container aquatic in lined ponds or indoor water gardens, overwintered indoors. Susceptible to aphids on emergent flower spikes and to crown rot if tubers are stored too wet during dormancy.
Native Range
Aponogeton natans is native to tropical and subtropical Asia, including India, Sri Lanka, Bangladesh, and parts of Southeast Asia. It occurs in still and slow-moving freshwater habitats — ponds, ditches, rice paddies, and seasonal pools — from lowlands to approximately 3,000 feet (900 m) elevation.Suggested Uses
Grown in container water gardens, lined half-barrels, and indoor aquatic displays. Effective as a surface cover plant in small ponds, reducing algae by shading the water surface. In tropical and subtropical climates (USDA zones 10–12), planted permanently in ponds and slow streams. In the Pacific Northwest, treat as a tender aquatic — overwinter indoors.How to Identify
Appearance
Size & Dimensions
Height1" - 2"
Width/Spread1' - 2'
Reaches mature size in approximately 1 years
Bloom Information
Flowers appear intermittently from late spring through autumn when water temperatures exceed 65°F (18°C). Each spike emerges above the water surface and opens progressively over 5–10 days. In warm conditions, flowering is nearly continuous. Pollinated by insects visiting the emergent spikes. Small green fruit develop underwater after pollination.Detailed Descriptions
Foliage Description
Bright greenGrowing Conditions
Sun Requirements
Requires 4-8 hours of direct sunlight daily
• Full Sun: 6+ hours of direct sunlight
• Partial Shade: 3-6 hours of direct sunlight
• Full Shade: Less than 3 hours of direct sunlight
Care & Maintenance
Care Guide
Plant tubers 2–3 inches (5–8 cm) deep in a container of heavy loam (not peat-based compost) topped with gravel to prevent clouding, and submerge in still water 6–18 inches (15–45 cm) deep. Site in full sun to partial shade. Water temperature should remain above 60°F (15°C) for active growth. Feed with aquatic plant fertiliser tablets pushed into the substrate every 4–6 weeks during the growing season. In the Pacific Northwest, grow in a container pond or lined half-barrel that can be moved indoors or into a greenhouse before water temperature drops below 55°F (13°C) in autumn. During winter dormancy, store the container in a cool, frost-free location (40–50°F / 5–10°C) with the soil kept barely moist. Resume submersion in spring when water warms.Pruning
Remove dead or yellowing floating leaves throughout the growing season. Cut spent flower spikes at the water surface. During autumn dormancy onset, remove all dead foliage. No other pruning is required.Maintenance Level
moderateContainer Growing
✓ Suitable for container growing
Minimum container size: 5 gallons