Vegetable · Vining gourd
Luffa
Luffa aegyptiacaA vigorous tropical vine that needs a genuinely long, warm season to turn its fibrous fruit into a full-size sponge. In shorter temperate seasons it is a race against the calendar, so every extra week of head start counts. The one rule: get it started indoors early and give it a sturdy structure to climb from day one.
Sow depth
¾ in
Spacing
3 ft · rows 4 ft
Sun
Full sun
Germination
7–14 days
Time to harvest
150–200 days
Difficulty
Moderate
When to sow luffa
- Sow from about 8 weeks before your last expected frost until about 6 weeks before your last expected frost.
Start indoors 6–8 weeks before the last frost date; soak seed 24 hours first.Sow into deep pots so the long taproot is not disturbed at transplanting.Harden off and set out only once nights stay reliably warm.
Provide a strong trellis — mature vines get heavy and sprawl widely without one.Water deeply and often; vigorous vines are thirsty through summer heat.Feed regularly through the season to fuel the long run to maturity.
Pick young fruit at 6–8 in if eating it like a squash.For sponges, leave fruit on the vine until the skin turns dry, brown, and papery.Cut mature fruit before hard frost and finish drying and peeling indoors.
Companion plants
Marigolds and nasturtiums nearby help lure cucumber beetles and squash bugs away from the vines, while beans fix nitrogen that hungry luffa puts to good use.
Watch out for
Cucumber beetle — Chews leaves and spreads bacterial wilt through the season. Cover young plants with mesh until flowering begins.Powdery mildew — Coats leaves in humid, still conditions late in the season. Space vines well and water at the soil line.