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Last edited on November 02, 2026. View history

Smooth Skinned Luffa

Luffa aegyptiaca

A variety of luffa

How to sow smooth skinned luffa: Direct seed. If planting indoors, harden off before transplanting seedlings outside.

Sun requirement for smooth skinned luffa: Plant in Full Sun

A smooth-skinned luffa (loofah) that grows like a cucumber with upright flowers. It is frost tender but grows across a wide climate range, at least down to Hamilton. Picked in autumn and dried, then peeled and shaken to release the seeds, the fibre is used as a scrubber. Stains can be soaked out in hydrogen peroxide.

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Smooth skinned luffa facts

Lifespan

Annual living and reproducing in a single year or less
Optimal temperature 23–27 °C
Absolute temperature 10–38 °C
FAO EcoCrop
Optimal rainfall 1200–2000 mm/year
Absolute rainfall 300–3000 mm/year
FAO EcoCrop
Optimal soil pH 5.5–6.5
Absolute soil pH 4.3–8.3
FAO EcoCrop

Crop cycle

70–120 days
FAO EcoCrop

Max altitude

1000 m
FAO EcoCrop

Optimal light

clear skies
FAO EcoCrop
What are growing degree days?

A plant grows with warmth, not with days. A growing degree day is one day's worth of useful warmth: how many degrees the day's average temperature is above the lowest temperature the crop grows at. Add them up from planting and you know how far along the crop is, whatever the calendar says.

Say that lowest temperature is 10°C. A day averaging 17°C gives 7 growing degree days. A day averaging 8°C gives none, as it is too cold for the crop to grow. That is why the same lettuce takes about 50 days in a summer and 90 in an autumn: it needs the same total warmth either way.

For smooth skinned luffa, the FAO EcoCrop database gives a lowest growing temperature of 10°C and a shortest growing cycle of 70 days at its best temperature, about 1050 growing degree days to a first harvest.

Where you've told us where your garden is, we use this and the weather there to predict when your smooth skinned luffa will be ready to harvest. We don't use it for how long a plant lives or when it finishes: we go by what members have logged for that.

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Ecological requirements

Data from the FAO EcoCrop database for Luffa cylindrica (L)M.Roemd.

Family / Taxonomy Magnoliopsida
Dilleniidae
Violales
Cucurbitaceae
Life form herb, vine
Life span annual
Habit climber/scrambler/scadent
Optimal soil depth medium (50-150 cm)
Optimal soil texture medium, organic
Optimal soil fertility moderate
Optimal soil drainage well (dry spells)
Optimal soil salinity low (<4 dS/m)
Photoperiod short day (<12 hours), neutral day (12-14 hours)

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