How to Grow Water Spinach

Soil & Growing Conditions

Soil pH range

5 7

Span reflects genuine variation between the cited authorities, not a single agreed figure.

Growth Stages

1. Sowing and germination (BBCH 0): Soak seed overnight in clean water, then sow about 1cm deep under cover from late February into early March; seed needs 16-18°C to germinate (Plantura, Balcony Garden Web).
2. Thinning and establishment (BBCH 1): Thin seedlings once 8-10cm tall to leave 15-20cm between plants; give ample sun, ideally 6-8 hours a day, and keep the roots constantly moist or wet (Balcony Garden Web, Plantura).
3. Rapid vegetative growth (BBCH 3)
4. Cut-and-come-again harvest (BBCH 4): Harvest young tender leaves and shoots from about 4-6 weeks after sowing; take everything except the base leaves, since that hard pruning pushes the plant to sprout and branch for repeat cuts (Plantura, Balcony Garden Web).

Quick Facts

Factor	Value
Soil pH	5 - 7
Optimal growing temp	15-35°C
Drainage	Constantly moist to waterlogged/shallow water
Lifecycle	perennial
Edible parts	leaves, young shoots

At a Glance

Harvest & Storage

When to pick: Grown for its edible leaves and young shoots; cut-and-come-again style harvesting of tender growing tips is standard practice for this trailing vine.

Storage

Best used fresh

Diseases

Water spinach white rust

Albugo ipomoeae-aquaticae

Peer-reviewed (PMC): "White rust caused by Albugo ipomoeae-aquaticae, which happens in almost all the planting areas" of water spinach.

Pests

Aphids

Aphididae (various spp.)

Kangkong (water spinach) is susceptible to common garden pests including aphids.

Slugs

Gastropoda (slugs, various spp.)

Kangkong is susceptible to common garden pests including slugs.

Snails

Gastropoda (snails, various spp.)

Kangkong is susceptible to common garden pests including snails.

Sources

1. Balcony Garden Web - How to Grow Kangkong | Growing Water Spinach

   Soak seeds overnight in clear water before sowing 1cm deep for soil-grown types. Once seedlings emerge and reach 8-10cm tall, thin out the weaker ones to leave 15-20cm between plants. Site in a position receiving ample sunlight, preferably 6-8 hours of direct sun per day. Keep the soil constantly moist. Harvest when leaves and shoots are young and tender, usually 4-6 weeks after sowing, either completely or cut-and-come-again, since secondary shoots form and grow.

2. FAO EcoCrop - Ipomoea aquatica data sheet
3. GBIF - GBIF Backbone Taxonomy: Ipomoea aquatica
4. Infonet Biovision - Alternative hosts of the sweet potato weevil
5. Plantura - Water spinach: growing, harvesting & benefits

   Originates from tropical and subtropical zones, found naturally in streams, ponds, rivers and flooded rice fields; known as phak bung in Thailand and kangkong in Indonesia. Thick, hollow stems with alternating leaves; grows rapidly, potentially to 3m in length, creeping or floating depending on variety. Seeds need 16-18°C to germinate; sow end of February to beginning of March. Demands consistently moist or wet conditions, making hydroponic growing ideal. Harvest after 4-6 weeks under ideal conditions, cut-and-come-again: harvest everything except the base leaves, as radical pruning encourages the plant to sprout and branch.

These 5 sources are specific to this region. The full list of 9 sources behind this guide (Balcony Garden Web, FAO EcoCrop, Florida Department of Agriculture and Consumer Services and others) is in the references of our UK guide to water spinach; they describe the plant itself, which is the same wherever it grows.