What Is Aldrovanda?

Aldrovanda vesiculosa, the waterwheel plant, is a remarkable free-floating aquatic carnivorous plant closely related to Venus flytraps. It grows entirely submerged, producing whorls of tiny snapping traps along a continuously extending stem -- the traps close in 10 milliseconds, one of the fastest movements in the plant kingdom.

Once widespread across Europe, Asia, Africa, and Australia, it has become increasingly rare in the wild due to habitat loss and water pollution. It is now primarily maintained in cultivation by dedicated growers. Growing Aldrovanda successfully requires very clean, low-nutrient water, strong light, and stable conditions.

Setting Up an Aldrovanda Container

Aldrovanda requires a dedicated aquatic setup with clean, low-nutrient water.

Container Options

• Shallow aquarium or large bowl -- 6-12 inches deep works well
• Outdoor tub -- excellent for summer growing with natural sunlight
• Heated indoor tank for year-round growing

Water Preparation

• Use only distilled, rainwater, or RO water
• Slightly acidic pH (5.5-6.5) is ideal
• Optional: add a small amount of dried leaf litter to encourage microfauna
• Gentle water movement or occasional stirring helps oxygen levels

Light Requirements

Aldrovanda needs bright light to full sun for 6-10+ hours per day. Strong light is essential for photosynthesis, active trap function, and compact, healthy growth. Insufficient light results in pale, stretched stems and inactive traps.

Outdoor summer growing in full sun is ideal. When growing under artificial light, use high-output LEDs positioned close to the water surface.

Companion Plants

Growing Aldrovanda with companion aquatic plants can improve conditions significantly:

• Water hyacinth or water lettuce -- absorb excess nutrients and provide some shade from intense direct sun. Do not let them crowd out light entirely.
• Small submerged plants -- help oxygenate water and support microfauna populations

Microfauna in the water -- protozoa, rotifers, small crustaceans -- are the primary food source for Aldrovanda's tiny traps. Healthy microfauna populations are supported by some organic material and companion plants.

Dormancy

Dormancy requirements depend on the origin of your plant:

• Tropical forms -- grow year-round with no cold period required
• Temperate forms -- form dormant turions (compact winter buds) that sink to the bottom in cold weather and re-emerge in spring

If you have a temperate form, allow the turions to sit at the bottom of the container through winter at 35-50°F. They will re-sprout when temperatures rise in spring.

Best Aldrovanda for Beginners

• Tropical Aldrovanda -- easiest to grow, no dormancy required
• Temperate forms -- require winter dormancy but very hardy otherwise

Common Problems & Fixes

Sudden Disintegration / Rapid Decline

Water quality failure. Perform an immediate water change with fresh distilled water. Check for contamination sources -- mineral buildup, tap water accidentally added, or stagnation.

No Growth or Extremely Slow Growth

Almost always insufficient light. Move to a sunnier position outdoors or upgrade to a stronger grow light positioned very close to the water surface.

Traps Not Closing

Insufficient light or the plant is stressed by poor water quality. Address both simultaneously.

Turions Not Sprouting in Spring

Temperature may still be too cold. Aldrovanda turions typically sprout when water temperatures reach 65°F+. Give them time and patience.