- Herbaceous perennial
- USDA hardiness zones:
- Full sun
A frost-tender aquatic perennial that is winter hardy to USDA Zones 9-11 where it can be quite invasive. In St. Louis, it will generally not survive winter and is often grown as an annual. It is easily grown on still water in full sun. Needs hot summer weather and full sun to bloom. Scatter small bunches of plants on the water surface after last frost date. Plants spread quickly in optimum conditions by stolons that radiate outward from the mother plant. Remove excess plants as needed. Several plants may be lifted in fall before frost for overwintering in containers of wet, sandy loam in bright light at indoor temperatures of 60-70 degrees F. However, many St. Louis gardeners prefer to grow water hyacinth as an annual by simply repurchasing new plants each spring.
Size and growth:
- 0.5 to 0.75 feet
- 0.5 to 1.5 feet
Bloom / flowers:
- June - September
- Lilac to lavender
Lavender, Water plant, Natural, Showy flowers, and Annual
Tropical South America, widely naturalized throughtout tropics and subtropics
Free floating aquatic perennial for water gardens or ponds.
No serious insect or disease problems. An invasive species in mild winter climates.