starfruit (Averrhoa carambola), photographi

How to Grow Starfruit

Averrhoa carambola · Zones 10-12

Starfruit is a tree, a long-term addition to the landscape. It's hardy across USDA zones 10 through 12 and stands up to deer. Its flowers are a moderate draw for honeybees, even though the fruit is the prize. It roots deep, which helps it reach moisture in a dry spell and open up tight soil as it establishes.

Starfruit — the short answer

Starfruit: grown in zones 10–12, part sun, pH 5–8.5.

USDA zones
10–12
Manual horticultural correction (source not retained); NC State Extension and Missouri Botanical Garden, with the remaining rows from other published sources or Growable Ground compilation
Soil pH
5–8.5
FAO ECOCROP
Sun
Part Sun
Growable Ground Plant Database
Frost-kill temperature
30.2°F
FAO ECOCROP

Plant data: Growable Ground Plant Database, compiled from FAO ECOCROP, USDA PLANTS and university Extension sources — each tile names its own row's source, because per-field provenance varies.

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Score Starfruit on your exact land.

Zone averages can't see the slope, soil, frost, and sun that decide whether starfruit actually takes — and those shift from one yard to the next. Enter your address and we'll score starfruit against your land's real conditions.

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What Starfruit is

Starfruit grows as a perennial and reaches around 25 feet at maturity. It's also deer-resistant.

How to grow Starfruit

Starfruit grows in USDA zones 10 through 12. Starfruit does best in part sun — at least 4 hours of direct sun a day — and soil from pH 5 to 8.5, on well-drained ground. It needs around 4,500 growing degree days to mature, a growing season of at least 240 frost-free days, and about 0 hours of winter chill to set fruit, which is why climate matters as much as soil.

USDA Zones

10-12

USDA PHZM 2023

Soil pH

5 - 8.5

FAO ECOCROP

Sun

Part Sun

Growable Ground plant catalog

Drainage

well (dry spells)

Growable Ground plant catalog

Frost Kill Temperature

30.2°F

Where cold starts killing growing tissue. Not a winter-survival floor — a dormant perennial takes far colder, which its hardiness zone answers.

FAO ECOCROP

Minimum Growing Temperature

41°F

Below this it stops growing rather than dies — a pace limit, not a survival limit.

FAO ECOCROP

GDD Required

4500+

Growing degree-days of accumulated warmth it needs to mature — humid summers reach this faster than cool coastal ones.

Growable Ground plant catalog

Mature Height

25 ft

Growable Ground plant catalog

Chill Hours

0+

Winter hours below ~45°F it needs to fruit — too-mild winters can leave it bloom-shy.

Growable Ground plant catalog

Frost-Free Days

240+

The frost-free stretch it needs start to finish — short-season areas may need an indoor head start.

Growable Ground plant catalog

  1. Plant it right

    Set starfruit in part sun with well-drained soil. Many fruit trees need a second variety nearby to pollinate — check before you plant just one.

  2. Match the soil

    Starfruit prefers pH 5 to 8.5 (FAO ECOCROP). A quick soil test from your local Extension lab tells you whether to add lime or sulfur to land in band.

  3. Water steadily

    Keep the root zone evenly moist through establishment. A 2–3 inch mulch layer holds moisture without waterlogging.

  4. Be patient, then harvest

    Prune annually while the tree establishes; fruit trees reward patience with years of harvest. Local Extension guides publish per-cultivar bearing-age tables.

Where Starfruit thrives

Starfruit is hardy across USDA zones 10 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.

A USDA zone is a 10°F band of average annual extreme winter minimum, so zones 1012 spans average winter lows from 30°F to 60°F (USDA PHZM 2023). Across the 50 states and DC, that band covers none outright but splits 8 down the middle — and which side of that line your land sits on changes the answer.

Zones 10–12 highlighted on the USDA national hardiness zone map

Zones 10–12·Where Starfruit growsOpen map →

Where Starfruit stands, state by state

Starfruit is rated for zones 1012 — a cold floor USDA puts at 30 to 40°F. Across the 50 states and DC, 0 sit fully inside that band, the line runs through 8 more, and 43 sit outside it — and inside every split state, the same line runs on at county grain.

The line runs through

8 states

3 of 8 shown

Starfruit’s band covers part of each of these states — which side of the line your county sits on changes the answer, and each state page draws it.

Outside zones 10–12

43 states

3 of 43 shown

Winter cold is the limit here — the same plant often works in a container that comes under cover. Each link is that state’s own growing hub.

State zone extents: USDA Plant Hardiness Zone Map (PHZM) 2023. A zone is a 10°F band of average annual extreme minimum temperature, so a state that splits the band contains the boundary — its own page draws the county line, and a parcel report resolves which side your land sits on.

Good to know

One caution for pet owners — starfruit is toxic to dogs and cats (mild severity). Keep it out of reach, and call ASPCA Animal Poison Control at (888) 426-4435 in an emergency. (Source: Cornell Poisonous Plants Database.)

Starfruit offers moderate value to bees and other pollinators.

Before you harvest starfruit, know your soil

Anything you grow to eat takes up what's in the ground it grows in, so it's worth knowing what's documented near you before you plant starfruit for food. Our free screen reads 9 federal source types across roughly 1.8M indexed sites and shows which sit near your address and which way they drain. It's a screening estimate from public records and proximity — not a soil test — so a nearby record means a soil test is worth it, not that your soil is unsafe.

Your land is one point inside Starfruit's range

This page resolves to the species. Your state page draws the county line, and a report reads the parcel — the soil pH, drainage, sun, and frost dates on your exact ground, which no species average can see.

Free Report

See if Starfruit will thrive on your land

Zone averages are a start. Your exact soil pH, drainage, sun exposure, and frost dates shape whether starfruit actually takes — we score it against the real conditions at your address.

Three things about your exact spot that zone averages miss:

Your soil pHYour frost-free daysYour sun & shade

We read public map data for this spot — soil, climate, flood, and parcel records. How we handle your address.

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How we know this about Starfruit

The figures above are cited per row, not per site: the pH band names this plant’s own source column, the three temperature figures each carry their own, and days-to-maturity cites the publication that actually lists it. All of it comes from the Growable Ground Plant Database — a compilation over FAO ECOCROP, USDA PLANTS, and university Extension sources, published openly with per-field provenance.

Grounded inUSDA PLANTS DatabaseUSDA PHZMASPCA

Frequently asked questions

Can I grow Starfruit in my zone?

Starfruit grows in USDA hardiness zones 10 through 12 (USDA PHZM 2023). Zone is one factor — soil pH, drainage, and frost dates on your specific parcel also shape whether it takes.

When should you plant Starfruit?

Set starfruit out in early spring or fall while it's dormant, so the roots establish before the heat of summer. Your local last-frost date — which a Growable Ground report pulls for your exact address — sets the precise window.

How much sun does Starfruit need?

Starfruit does well in partial sun — around 4 hours of direct sun, and it takes some afternoon shade in stride. That flexibility makes it a good match for a bed the house or a nearby tree shades for part of the day. A Growable Ground report maps how the sun actually falls on your land, hour by hour, so you can set it where the light lines up.

What soil does Starfruit need?

Starfruit prefers soil pH 5 to 8.5, on well-drained ground (FAO ECOCROP). Your report scores your parcel's actual soil against that using USDA SSURGO data.

Does Starfruit attract pollinators?

Yes — starfruit's flowers are a solid nectar source for honeybees.

Is Starfruit safe for pets?

Starfruit is toxic to pets (dogs,cats) with mild severity. Keep it out of reach, and call ASPCA Animal Poison Control at (888) 426-4435 in an emergency. (Source: Cornell Poisonous Plants Database.)

Keep exploring Starfruit

Starfruit by USDA hardiness zone