leafy green
EdibleWater Spinach / Kangkong
Ipomoea aquatica
Considered non-toxic to cats and dogs (source: ASPCA (not listed; edible leaves)).
A sunny south-facing window with 6+ hours, or a grow light.
Likes consistently moist soil; don’t let it dry out.
Forgiving and beginner-friendly.
Water spinach (kangkong, ong choy) is a defining green of Philippine, Vietnamese, Thai, and southern Chinese cooking, prized for tender stems that stay crisp in a stir-fry. It loves heat and constant moisture. Note it is a regulated invasive in parts of the US — check local rules before growing.
About Water Spinach / Kangkong
Water spinach (Ipomoea aquatica), known as kangkong or ong choy, is a defining green of Philippine, Vietnamese, Thai, and southern Chinese cooking, prized for hollow stems that stay crisp in a fast stir-fry. It thrives on heat and water in a way few greens do, so a renter with a warm, bright spot can crop it heavily from a 5-litre pot. One caution comes first, though. It is a regulated invasive in parts of the US, so check local rules before growing it.
The key is to keep it wet. Stand the pot in a tray of water through warm weather and give it strong light, and it grows fast and tender. Cut the stems above a leaf node and it regrows hard for repeated harvests. You can even root cut stems in water to start new plants. A first picking comes around 35 to 55 days, sooner in real heat.
What it’s like to grow
Water spinach is easy where it is warm, and its needs are simple: heat, light, and plenty of water. In cool conditions it toughens and slows, which is the main thing to watch. The more important note is legal rather than horticultural. It is restricted or banned in some regions as an invasive, so confirm it is allowed where you live. It is not listed as toxic to cats and dogs.
What to expect
First harvest in about 35–55 days. It’s forgiving, so it’s a good one to learn on. No sunny window? It also does fine under a clip-on grow light.
See what you’ll need to get started ↓♻ Regrow from scraps
Root cut stems in water until they sprout, then plant them in a pot kept very wet.
Tips
- Keep it very wet; stand the pot in a tray of water in warm weather.
- Give it heat and strong light for fast, tender growth.
- Cut stems above a leaf node and it regrows quickly.
Common problems
- Toughening and slowing in cool conditions.
- Restricted or banned in some regions as an invasive — confirm locally.
Common questions
Is Water Spinach / Kangkong toxic to cats and dogs?
Water Spinach / Kangkong is non-toxic to cats and dogs, which makes it a safe pick if you have pets. Source: ASPCA (not listed; edible leaves).
How much light does Water Spinach / Kangkong need?
Water Spinach / Kangkong wants bright light — a south-facing window with six or more hours of sun, or a grow light to make up for it.
How often should I water Water Spinach / Kangkong?
Keep Water Spinach / Kangkong's soil consistently moist. It likes regular water and dislikes drying out, so check it often in warm or dry rooms.
What temperature does Water Spinach / Kangkong need?
Water Spinach / Kangkong is happiest around 20–35 °C. It tolerates brief dips to about 10 °C, but cold drafts and sudden chills set it back.
Does Water Spinach / Kangkong need high humidity?
Water Spinach / Kangkong prefers humid air. Group it with other plants, stand it on a pebble tray, or run a humidifier — dry indoor air tends to brown the leaf tips.
How long does Water Spinach / Kangkong take to grow?
Expect a first harvest about 35–55 days from sowing under good conditions. A fast, heat-loving green that regrows hard after cutting; one pot gives repeated harvests through warm months.
Can I grow Water Spinach / Kangkong without a sunny window?
Yes. Water Spinach / Kangkong does well under an affordable clip-on grow light, so a bright window isn't essential.
How big does Water Spinach / Kangkong get?
A sprawling trailing green; grow several stems in a wide pot kept very wet.
How do I propagate Water Spinach / Kangkong?
Root cut stems in water, then plant in a pot kept very wet; or sow seed.
What pests affect Water Spinach / Kangkong?
Watch for aphids, leaf miners and spider mites. Check new growth and the undersides of leaves often, and treat early with a rinse or insecticidal soap before they spread.
Is Water Spinach / Kangkong easy to grow?
Yes. Water Spinach / Kangkong is forgiving and one of the better plants to learn on.
Gear for Water Spinach / Kangkong
Gear suggestions to get you started — general picks, not paid placements.
Pet-toxicity from the ASPCA. Care details are general guidance, not professional or veterinary advice; only eat plants you can positively identify as the edible plant and part described. Photo: Wee Hong, CC BY-SA 4.0, via Wikimedia Commons (CC-BY-SA). Care info last updated 2026-06-08.