DIFFICULTY Easy–Moderate

A forgiving choice for newer planted tanks.

LIGHT Very High

Around 10 hours is a useful starting point.

CO₂ Optional

Injection is not normally necessary.

GROWTH Fast

Weekly trimming needs.

PLANT OVERVIEW

About Water Hyacinth

A large floating plant with bulbous stalks and showy flowers.

Water Hyacinth floats on inflated, spongy leaf stalks and produces lavender flowers outdoors, with long feathery roots that shelter fry. It's a powerful nutrient remover but is a banned invasive species in many areas and needs very strong light — better suited to ponds than most aquariums. Check local regulations before keeping it.
Low-tech suitable High-tech suitable Fry cover
CARE PROFILE

What this plant needs.

The useful numbers and practical notes, grouped around how you actually keep the plant.

TANK FIT

Placement + size

Primary placementFloating
Typical height4–12 in
Typical width8 in
Suggested minimum tank20 gal
Suggested tank height6 in+
LIGHT + CO₂

Energy demand

Ideal lightVery High
Photoperiod range8–12 hr
Approx. PAR50–130
Injected CO₂Optional
CO₂ benefitVery Low
NUTRITION

Where it feeds

Root feedingVery Low
Water-column feedingHigh
Overall fertilizer demandModerate
Iron demandHigh
MicronutrientsModerate
WATER

Useful parameter range

Temperature68–84°F
pH6–7.8
GH2–15 dGH
KH1–12 dKH
PLANTING

How to plant it.

Substrate: None — floats at the surface

Leave floating; keep the surface calm and avoid trapping leaves under filter output.

GROWTH + PROPAGATION

What to expect after planting.

Propagation

Division / daughter plants

Acclimation

Sensitive to condensation and heat on the leaf tops; keep a gap under lids.

COMMON PROBLEMS

What usually goes wrong.

Invasive noxious weed banned in many regions; needs intense light and warmth to thrive indoors.