Water Spinach.

At a glance

Care level

Easy

Plant type

Aquatic vegetable

Light

Full sun to partial shade

Indoor light

Bright indirect

Water

Every 1 to 2 days

Mature size

3 to 10 feet

Growth rate

Fast

Hardiness

USDA 10 to 12

Bloom time

Summer to early autumn

Care

Keep the soil saturated or grow the plant directly in water to mimic its natural wetland habitat. Watch for yellowing leaves, which often signal a need for more nutrients or better light. Ensure the water stays fresh to prevent any issues with stagnation.

Watering

The soil must remain consistently waterlogged or submerged.

Feeding

Use a balanced liquid fertilizer to keep the foliage lush.

Pruning

Trim the stems regularly to encourage bushier growth and prevent it from becoming too leggy.

Repotting

Repot if the plant becomes root bound in its container or if you are moving it to a larger water feature.

Soil

Rich, loamy, or aquatic soil

Soil pH

5.5 to 7.0

Temperature

15 to 35°C

Humidity

70 to 95%

Safety

People

The plant is generally considered safe for consumption when cooked, though raw ingestion is discouraged due to potential waterborne pathogens.

Children

Ensure children do not play in the water where this plant grows, as it may harbor bacteria or parasites.

Contact allergens

Contact with the sap may cause mild skin irritation in sensitive individuals.

Airborne allergens

Pollen may cause mild reactions in those with severe seasonal allergies.

Edibility

Water spinach must be cooked thoroughly to eliminate the risk of parasites like Fasciolopsis buski that can thrive in contaminated water.

How to identify it

• Long, arrow shaped leaves
• Hollow, floating stems
• Trumpet shaped white or pink flowers
• Creeping or trailing growth habit

Height

0.1 to 0.3m

Spread

1 to 3m

Leaves

green, deciduous

Flowers

white, lavender, 3 to 5cm

Fruit

brown, Summer to autumn

Common problems

• White rust — Fungal infection causing white pustules on the undersides of leaves.
• Aphids — Small insects that suck sap from new growth.

Growing it

Propagation

cuttings, seed

When to plant

spring, summer

Keep this plant isolated in its own container to prevent it from outcompeting other species in your garden.

Grows well with

• Water hyacinth — They share similar aquatic growing requirements.

Similar species

• Sweet potato — They are closely related and share similar leaf shapes.

Science

Family

Convolvulaceae

Genus

Ipomoea

Order

Solanales

Class

Magnoliopsida

Native range

Tropical and subtropical regions of Asia.

Conservation

It is considered an invasive species in many parts of the United States and should be grown with caution.

It thrives in marshes, ponds, and slow moving water where it can spread rapidly across the surface.

Value to wildlife

nectar source

Pollinators

bees, butterflies

Uses

culinary vegetable, aquatic groundcover

Taxonomy resolved against GBIF.

Questions people ask

Can I grow this in a regular pot?

Yes, but it requires a very large container kept constantly saturated with water.

Is it invasive?

Yes, it is highly invasive in many warm climates and should never be released into natural waterways.

Where the name comes from

The genus name Ipomoea comes from Greek words meaning worm and likeness, referring to the twining habit of the vines.

Good to know

• It is also known as water morning glory.
• The stems are hollow, which helps the plant float.
• It grows incredibly fast in warm, wet conditions.
• It is a member of the Convolvulaceae family.