Kangkong is a perennial grown for its leaves, ready to start cutting about 45 days after sowing. It's hardy across USDA zones 9 through 12 and grows just as well in a container as in the ground. Its flowers are a modest draw for honeybees, even though the leaves are the prize. Once it comes in, a single planting keeps producing for six weeks or so, so you harvest over time rather than all at once.
Zones
9-12
pH Range
4.3-7.5
Sun
Full Sun
Days to Maturity
45
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What Kangkong is
Kangkong grows as a perennial and reaches around a foot and a half at maturity. It's also well suited to containers.
How to grow Kangkong
Kangkong grows in USDA zones 9 through 12 and is ready to harvest about 45 days after planting. Kangkong does best in full sun — at least 6 hours of direct sun a day — and soil from pH 4.3 to 7.5, on consistently moist ground. It needs around 1,500 growing degree days to mature and a growing season of at least 30 frost-free days, which is why climate matters as much as soil.
USDA Zones
9-12
USDA PHZM 2023
Soil pH
4.3 - 7.5
USDA PLANTS Database
Sun
Full Sun
plant_species_v5.csv
Drainage
poorly (saturated >50% of year)
plant_species_v5.csv
Frost Tolerance
50°F
plant_species_v5.csv
Days to Maturity
45 days
plant_species_v5.csv
GDD Required
1500+
plant_species_v5.csv
Mature Height
1.5 ft
plant_species_v5.csv
Frost-Free Days
30+
plant_species_v5.csv
Start the season right
Plant kangkong in full sun with at least 6 hours of direct sun, once the soil has warmed and frost risk has passed.
Match the soil
Kangkong prefers pH 4.3 to 7.5 (USDA PLANTS Database). A quick soil test from your local Extension lab tells you whether to add lime or sulfur to land in band.
Water steadily
Keep the root zone evenly moist through establishment. Match watering to the plant's drainage preference and your local rainfall.
Harvest at maturity
Kangkong is ready about 45 days after sowing (University Extension production guides). Cut the outer leaves as you need them — frequent harvest keeps new growth coming.
Good to know
Good news for pet owners — kangkong isn't known to be toxic to dogs or cats. (Source: ASPCA.)
Kangkong offers low value to bees and other pollinators. (Source: Xerces Society, Pollinator Partnership.)
Where Kangkong thrives
Kangkong is hardy across USDA zones 9 through 12. Zone is only the starting point, though: the soil pH, drainage, and frost dates on your specific land decide how well it actually does.
Zones 9–12·Where Kangkong growsOpen map →
On USDA hardiness-zone overlap, Kangkong can grow in these states:
See if Kangkong will thrive on your land
Zone averages are a start. Your exact soil pH, drainage, sun exposure, and frost dates shape whether kangkong actually takes — we score it against the real conditions at your address.
Three things about your exact spot that zone averages miss:
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Frequently Asked Questions
Can I grow Kangkong in my zone?
Kangkong grows in USDA hardiness zones 9 through 12 (USDA PHZM 2023). Zone is one factor — soil pH, drainage, and frost dates on your specific parcel also shape whether it takes.
How long does Kangkong take to grow?
Kangkong is ready to harvest about 45 days after planting (University Extension production guides). Your local frost dates and soil temperature move that window earlier or later.
When should you plant Kangkong?
Most growers plant kangkong after the last spring frost, once the soil has warmed, leaving enough of the season for its 30-day frost-free need. Your local frost dates set the exact window — a Growable Ground report reads them for your address.
How much sun does Kangkong need?
Kangkong needs full sun — a spot that catches at least 6 hours of direct summer sun a day. In more shade it still grows, but usually gives a smaller, later crop. The catch is that a yard rarely gets even light everywhere — a fence, the house, or one tall tree can quietly take those hours. A Growable Ground report reads the real sun-hours across your land, canopy and buildings included, so you can pick the brightest bed before you plant.
What soil does Kangkong need?
Kangkong prefers soil pH 4.3 to 7.5, on consistently moist ground (USDA PLANTS Database). Your report scores your parcel's actual soil against that using USDA SSURGO data.
Does Kangkong attract pollinators?
Yes — kangkong's flowers are a modest nectar source for honeybees (Xerces Society, Pollinator Partnership).
Is Kangkong safe for pets?
Kangkong is not known to be toxic to dogs or cats based on available data (ASPCA). Always supervise pets around new plantings.