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Luffa

Luffa aegyptiaca · cucurbits

At a glance

Light
Full sun
Frost
Tender
Start indoors
6 weeks before your last frost
Support
Needs a sturdy stake, cage or trellis
On this page

Also called smooth luffa, sponge gourd, dishcloth gourd, loofah.

No photo of this plant yet. We add one once we have a picture we can credit.

When do I plant this? › Plan this in your garden ›

The numbers

Spacing in row
91 cm36 in
Start indoors, weeks before last frost
6
Mature height
1.8 m6 ft (estimate)
Mature spread
30–91 cm12–36 in (estimate)
Days to maturity
60–90 (sources disagree)
Light
Full sun
Frost tolerance
Tender
Lifespan
Annual
Habit
Vine
Support
Needs a sturdy stake, cage or trellis

At harvest, and in a pot

Ready when
If you’re interested in eating them, then harvest the squashes when they are less than six inches long.
Keeps
About several weeks, cold and moist (0 °C32 °F to 4 °C40 °F, high humidity).
Pot size
At least 7.6 L (2 gallons US)at least 2 gallons (about 7.6 L).
The 4 sources

gardeningsolutions.ifas.ufl.edu

Luffa UF/IFAS Gardening Solutions

plants.ces.ncsu.edu

Luffa aegyptiaca NC State Extension Gardener Plant Toolbox

aggie-horticulture.tamu.edu

Chinese Okra Texas A&M AgriLife, Aggie Horticulture, Specialty Crops of Texas

edis.ifas.ufl.edu

Luffa—an Asian Vegetable Emerging in Florida UF/IFAS Extension EDIS HS1285

Numbers we’re less sure of

Many of our estimates come from an extension page we’ve read that gets close without pinning the number down. Others are still our own best guess, and on some the sources disagree. Treat them all as a starting point.

Rules that apply to luffa

Do not plant cucurbits in ground that held cucurbits within 2-3 years. Promising

Do not plant cucurbits in ground that held cucurbits within 2-3 years.

Promising

If you skip this, you lose real yield. The planner warns you.

How it works: Melittia cucurbitae overwinters as a pupa in the soil where its host grew and emerges the next summer; Anasa tristis overwinters as an adult in sheltered sites (plant debris, under boards or rocks) and flies to cucurbits in spring. A host-free break cuts local carryover, but both are strong fliers that re-invade from a distance, so rotation is only partial and works best paired with fall sanitation (destroy spent vines).

Evidence: checked against 4 sources in the research-based literature.

The 4 sources

extension.umn.edu

Squash vine borers UMN Extension
… squash vine borers spend the winter in the soil near their host plants ... Practice rotation ... planting cucurbits in different areas of your garden if possible, or alternate seasons

ohioline.osu.edu

Squash Vine Borer Ohioline (Ohio State Univ.)
Crop rotation away from previously infested fields helps reduce local populations, as overwintering pupae remain in the soil. However ... fields often need to be rotated more than 5 miles away as SVB can fly into fields from long distances.

extension.umn.edu

Squash bugs UMN Extension
Squash bugs can live through the winter as adults in sheltered places, such as under plant debris, around buildings, or under rocks. When adults come out in the spring, they fly to growing cucurbit plants.

vegetables.cornell.edu

Do Rotations Matter within Disease Management Programs? Cornell Vegetables
… 2+ years; avoid other cucurbits
Remedy

Plant cucurbits in different ground, or wait 3 years. Destroy the spent vines in autumn and clear debris and boards nearby. The pupae overwinter in the soil where the crop grew, the adults in the shelter around it. Rotation is only partial; both pests fly in from a distance.

Read the full rule › · open in the planner ›

Don't sow or set out tender crops before your last frost date Well established

Don't sow or set out tender crops before your last frost date

Well established

If you skip this, the planting fails. The planner won’t allow it.

How it works: Ice nucleation in leaf tissue.

Evidence: checked against 2 sources in the research-based literature.

The 2 sources

extension.colostate.edu

Vegetable Planting Guide Colorado State Univ. Extension, GardenNotes #720
From seed: around the date of the average last spring frost

extension.umn.edu

Growing tomatillos and ground cherries Univ. of Minnesota Extension
Transplant to the garden after all danger of frost has passed and the soil has warmed.
Remedy

Sow or set out after the last frost date, or start indoors and transplant once it has passed.

Read the full rule › · open in the planner ›

Pests of one plant family spread more easily through a solid block of it A good hunch

Pests of one plant family spread more easily through a solid block of it

A good hunch

If you skip this, it still grows, just less well. The planner suggests it.

How it works: Resource concentration. A specialist locates and holds its host more efficiently at higher host density and continuity, so an unbroken run of one family across adjacent beds is an easier target than the same family separated by a non-host (associational resistance).

Evidence: checked against 2 sources in the research-based literature.

The 2 sources

Organization of a plant-arthropod association in simple and diverse habitats: the fauna of collards (Brassica oleracea) Root 1973
… the resource concentration hypothesis, which states that herbivores are more likely to find and remain on hosts that are growing in dense or nearly pure stands; that the most specialized species frequently attain higher relative densities in simple environments.

Flea beetle movement in a broccoli monoculture and diculture Elmstrom, Andow & Barclay 1988
… strong, direct support for the hypothesis that host plants are harder to find and easier to lose in vegetationally diverse habitats than in monocultures.
Remedy

Where one family fills adjacent beds in a single season, breaking the run with a non-host family between them lengthens the distance the specialist must travel to the next host. The app discloses this and never docks a score. A continuous single-family block can be the right call anyway (a wind-pollinated crop like corn sets better massed), so the app names the trade-off and leaves the choice to the gardener.

Read the full rule › · open in the planner ›

Cold-hardy annuals can be sown or transplanted before the last spring frost (hardy crops about three weeks before, half-hardy about two weeks before). Tender crops wait for the frost itself. Promising

Cold-hardy annuals can be sown or transplanted before the last spring frost (hardy crops about three weeks before, half-hardy about two weeks before). Tender crops wait for the frost itself.

Promising

If you skip this, it still grows, just less well. The planner suggests it.

How it works: Cold hardiness. Hardy crops tolerate hard frost and half-hardy crops tolerate light frost, so they can occupy the ground weeks before frost-tender crops are allowed in. The offset is measured from the last spring frost.

Evidence: checked against 2 sources in the research-based literature.

The 2 sources

extension.illinois.edu

Time Your Vegetable Plantings by Cold Hardiness University of Illinois Extension
… withstand freezing temperatures and hard frosts without injury

extension.colostate.edu

Vegetable Planting Guide Colorado State Univ. Extension, GardenNotes #720
As early as 2-4 weeks before the date of the average last spring frost

Plus 2 working notes on how the sources were read.

Read the full rule › · open in the planner ›

Long-season warm crops are started indoors several weeks before the last frost and set out after it. Tomato and tomatillo go about six weeks ahead, pepper and eggplant about eight, basil six. Promising

Long-season warm crops are started indoors several weeks before the last frost and set out after it. Tomato and tomatillo go about six weeks ahead, pepper and eggplant about eight, basil six.

Promising

If you skip this, it still grows, just less well. The planner suggests it.

How it works: A frost-tender crop with a long days-to-maturity cannot mature if it is only direct-sown after the last frost, because the frost-free window is too short. A head start under cover buys the weeks the season lacks; the seedling is set out only once frost has passed, so the transplant date is still frost-gated.

Evidence: checked against 3 sources in the research-based literature.

The 3 sources

extension.umn.edu

Starting seeds indoors University of Minnesota Extension

We summarise this source in our notes rather than quote a line from it.

extension.illinois.edu

When should I start my seeds? University of Illinois Extension
Early-to-mid-March Vegetables & herbs: artichoke, broccoli, cabbage, cauliflower, eggplant, kale, lettuce, oregano

extension.umd.edu

Starting Vegetable Seeds Indoors University of Maryland Extension
Tomato: 5 to 6 weeks

Read the full rule › · open in the planner ›

White powdery spots on squash, cucumber, melon or pumpkin leaves are powdery mildew, a fungus that spreads on the wind and strikes the older leaves first. It weakens the plant and the fruit ripens early. Promising

White powdery spots on squash, cucumber, melon or pumpkin leaves are powdery mildew, a fungus that spreads on the wind and strikes the older leaves first. It weakens the plant and the fruit ripens early.

Promising

If you skip this, it still grows, just less well. The planner suggests it.

How it works: The fungus (mainly Podosphaera xanthii) grows on the leaf surface; the spores formed in each spot are carried by the wind to other leaves, and under favorable conditions it spreads until it covers most of the foliage. A plant that loses most of its leaf area to it is weakened, and its fruit ripens prematurely. It takes hold most readily on densely planted vines, plants crowded by weeds, plants in shade and over-fertilized plants.

Evidence: checked against 1 source in the research-based literature.

The source

extension.umn.edu

Powdery mildew of cucurbits UMN Extension
White powdery spots can form on both upper and lower leaf surfaces, and quickly expand into large blotches.
Remedy

Grow varieties with complete or partial resistance, and give the vines air. Space them properly at planting, stake where you can, and keep weeds down. Where powdery mildew has cost a crop before and the variety is susceptible, a fungicide may be needed. Start at the first spots.

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Frost can form on a night the forecast low is a few degrees above freezing. Promising

Frost can form on a night the forecast low is a few degrees above freezing.

Promising

If you skip this, the planting fails. The planner warns you.

How it works: On a clear, still night leaves lose heat to the open sky, so a leaf can fall to freezing and ice can form in it while the thermometer, a couple of meters up, still reads a few degrees above.

Evidence: checked against 7 sources in the research-based literature.

The 7 sources

www.weather.gov

Frost and Freeze Information NWS Tallahassee
Issued up to 24 hours when temperature is forecast to be between 32° and 36° on nights with calm winds

www.weather.gov

Freeze Watches and Warnings National Weather Service
… temperatures below 28°F for an extended period of time can kill most types of commercial crops and residential plants.

ipm.ucanr.edu

Freezing and Frost UC Statewide IPM Program
Frost occurs when air is warmer than 32°F but plant tissues drop to 32°F or below because plants radiate (lose) heat into the atmosphere, especially during cool, clear nights.

yardandgarden.extension.iastate.edu

Fall Planting of Vegetables Iowa State University Yard and Garden, Aaron Steil and Kim Hilgers
Tender crops will be damaged or destroyed by a light frost

extension.sdstate.edu

Fall Frost Tolerance of Common Vegetables SDSU Extension, Rhoda Burrows
Crops from more-temperate regions can withstand light freezes (28 to 32 degrees Fahrenheit):

extension.umn.edu

A Minnesota guide to garden timing UMN Extension, Robin Trott
A light frost (32°F) can damage tender plants, while a hard frost (28°F or colder) will kill most warm-season crops.

extension.colostate.edu

Frost Protection and Extending the Growing Season CSU Extension GardenNotes #722, Whiting, O'Meara and Wilson
Radiation frosts occur on calm clear nights that lack cloud cover to hold in heat.
Remedy

The evening before, cover the crops at risk with a sheet or frost cloth, never plastic, reaching the ground and loose at the bottom so the soil's warmth can rise under it, and take it off in the morning. A cover helps least in a long, hard freeze.

Read the full rule › · open in the planner ›

Another 129 rules depend on your own garden, like crop rotation, frost dates, sun, spacing and soil. See them all.

Cite this page

Milpa Gardens. "Luffa (Luffa aegyptiaca)." https://milpa.garden/plants/luffa-aegyptiaca/

A garden planner built on graded evidence. Every claim states its evidence grade and links its sources on the page. Cite it with the grade, and add the date you read it.

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