Luffa (sponge gourd) Luffa aegyptiaca
Luffa (sponge gourd) (Luffa aegyptiaca) is an annual vegetable in the Cucurbitaceae family, native to Old World tropics (probably India and Southeast Asia). It grows 4–8 m (13–26 ft) tall and 80 cm–1.5 m (31 in–4.9 ft) wide, wants full sun and moderate water, and is hardy to about 5 °C (41 °F). Space plants about 60 cm (24 in) apart.
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Luffa (sponge gourd) at a glance
| Type | Annual vegetable |
|---|---|
| Family | Cucurbitaceae |
| Mature height | 4–8 m (13–26 ft) |
| Mature spread | 80 cm–1.5 m (31 in–4.9 ft) |
| Spacing | 60 cm (24 in) centre to centre |
| Sun | Full sun, at least 7 h of direct sun a day |
| Water | Moderate; drought tolerance low, waterlogging tolerance none |
| Soil pH | 6–7 |
| Cold hardiness | About 5 °C (41 °F) once established (roughly USDA zone 11) |
| Heat stress | Likely above about 36 °C (97 °F) |
| Flowering | about 9–13 weeks after planting, for 10–16 weeks |
| Days to maturity | About 135 days from planting |
| Wind tolerance | Low |
| Pollinator value | High |
| Edible | Yes: young fruit (cooked), flowers, young shoots |
| Native to | Old World tropics (probably India and Southeast Asia) |
| Common in gardens of | 🇨🇳 China, 🇹🇭 Thailand, 🇸🇬 Singapore |
Is Luffa (sponge gourd) toxic?
- People: mildly toxic
- Cats: not well documented
- Dogs: not well documented
- Parts: mature bitter fruit, seeds
Mature fruit and seeds can be bitter from cucurbitacins and cause vomiting; only tender young fruit is eaten.
If a child or pet may have eaten part of a plant, call a poison centre or vet straight away.
Companion planting: what to grow with Luffa (sponge gourd)
No well-documented helpful pairing. Group it with plants that like full sun and moderate water.
Keep apart or take care
- caution With Cucurbits (squash family): Cucurbits share powdery mildew, cucumber beetles and mosaic viruses; good airflow and spacing reduce spread. Evidence C
Shared pests and diseases
- Powdery mildew: Powdery mildew spreads between cucurbits in warm, dry weather. Evidence C
Questions about Luffa (sponge gourd)
- How far apart should I plant Luffa (sponge gourd)?
- About 60 cm (24 in) apart, centre to centre. A mature plant spreads 80 cm–1.5 m (31 in–4.9 ft).
- Does Luffa (sponge gourd) need full sun?
- Full sun: at least 7 hours of direct sun a day.
- How much water does Luffa (sponge gourd) need?
- Moderate water. Drought tolerance is low and waterlogging tolerance none.
- How cold-hardy is Luffa (sponge gourd)?
- It tolerates about 5 °C (41 °F) once established, roughly USDA zone 11. As an annual it is usually planted out after the last frost.
- When does Luffa (sponge gourd) flower?
- About 9–13 weeks after planting, for 10–16 weeks.
- Is Luffa (sponge gourd) poisonous to cats and dogs?
- For cats it is not well documented; for dogs not well documented; for people mildly toxic. Mature fruit and seeds can be bitter from cucurbitacins and cause vomiting; only tender young fruit is eaten.
- What grows well with Luffa (sponge gourd)?
- There is no well-documented companion pairing for Luffa (sponge gourd). Group it with plants that like the same sun (full sun) and water (moderate).
Sources and evidence
Evidence grade C (C: plausible, mixed evidence).
- EcoCrop crop environmental requirements, FAO
- University extension gardening guides (general), Various land-grant university extensions
- Flora & Fauna Web, National Parks Board, Singapore
Notes and assumptions
- Typical garden-form values; cultivars and local conditions differ.
- Needs a long warm season; fruit left to mature on the vine yields the fibre sponge.
Reference values for planning, not horticultural, veterinary or medical advice. Varieties, soils and local climates differ: check with a local nursery or extension service.
Related plants
- Cucumber Cucumis sativus
- Zucchini (courgette) Cucurbita pepo
- Pumpkin Cucurbita maxima / C. pepo
- Watermelon Citrullus lanatus
- Muskmelon (cantaloupe) Cucumis melo
- Butternut squash Cucurbita moschata
- Bitter melon Momordica charantia
- Bottle gourd Lagenaria siceraria