Luffa

( LOO - fuh )

At-A-Glance Information

This genus includes tropical and subtropical vines that produce cultivated fruits that are consumed when young or allowed to mature and then dried. These plants are most commonly known for the product Loofa (Loofah), which is the source of the scrubbing sponge. Plants are also commonly known as Chinese Okra or Estropajo. Grow Luffa plants as members of vegetable gardens, or simply as ornamental vines on trellises.

Luffa Species and Varietals

The genus Luffa is a member of the plant family Cucurbitaceae, and includes just three species. Plants in this genus are related to those in Cucumis (Cucumber and Canteloupe), Cucurbita (Squash), Citrullus (Watermelon), and Lagenaria (Bottle Gourd). Luffa plants grow well in USDA hardiness zones 7-11. To find your zone, click here: Zone Map.

Luffa acutangula (Angled Luffa, Chinese Okra, Dish Cloth Gourd, Ridged Gourd, Strainer Vine, Ribbed Loofah, Silky Gourd, Silk Gourd)
This species of Luffa is native to south Asia, and is grown as a houseplant in cooler regions. Fruits resemble Cucumbers with ridges, and are harvested young for consumption as vegetables. Mature fruits are harvested when dry and processed to remove all but the fruit fibers. Vining stems reach up to 10-32 feet long. This species is considered invasive in Cuba and on Diego Garcia Island.

Luffa aegyptica (Sponge Gourd, Egyptian Cucumber, Vietnamese Luffa, Dishrag Gourd, Vegetable-Sponge, Smooth Luffa)
This annual vining plant species is native to southern and southeastern Asia. Green leaves have three lobes, and flowers are yellow. These vigorous vines reach up to 30 to 50 feet in once season, and produce fruits that are mature at 12-18 inches long. Sponge Gourd plants are considered invasive in Guam, the Dutch Caribbean, Cuba, Mexico, South America, and isolated Pacific Islands. Cultivars of this species are listed and described below:

'Leng Si Gua'
Produces high yields of quality sponges.

'Pang Si Gua'
Great for stir fries; fruits are typically harvested immature.

'Pusa Chikni'
Popular in India, these gourds are harvested young and consumed as vegetables.

'Richters'
Harvested for Loofah and used as a culinary vegetable.

'Smooth Short'
Short, cylindrical luffas harvested at 6" when immature for consumption as vegetable.

Caring for Luffa

Luffa plants are commonly grown from seed, either direct-sown into the garden in late springtime (once soil temperature reaches at least 70 degrees Fahrenheit) or started indoors six weeks before the last frost date of the area has passed by. These plants are also sometimes available from specialty nurseries from time to time. Space plants 12-18 inches apart from each other, and about 6 feet away from other plants.. Choose a planting spot that gets full sun during the day, and has a nearby trellis, fence, or other structure for the vines to climb. Also, make sure that there is enough space for a full-grown plant. When mature, these vines require ample vertical space and can cast a deep shadow on surrounding plants. Ideally, Luffa plants like to get between 6 and 8 hours of direct sun each day for best flowering and harvests. Ensure that soil is well-draining, rich in nutrients, and has a pH of between 6.0 and 6.5 (slightly acidic). If local soils are particularly poor in nutrients or do not drain well, make sure to amend the planting area with plenty of organic compost before installing. Apply a layer of mulch around the planting area to suppress weed growth, maintain consistent soil temperatures, and to increase soil moisture retention. Water new plantings regularly as they establish a strong root system in their new home. At maturity, Luffa vines will need regular waterings during their growth, blooming, and fruiting periods.

Fertilize yearly in early springtime with an application of 2 inches of compost around the base of plants. Pull mulch back before applying, work the compost gently into the soil a bit, water it in, and then replace mulch. These plants are not heavy feeders, and this should be sufficient to provide the necessary nutrients for the active growing and flowering seasons. Pruning is simple; remove any damaged, diseased, or dead foliage at any time during the growing season. To encourage a more vigorous branching structure, cut four of the stems back to the main stem. Once the plant develops fruits (about two months before the first frost date in your area), pinch away all flowers and any small luffa fruits on the vine. This will direct the plant to send more of its energy into the existing luffas on the vine, and will result in larger fruits. In most zones, Luffa plants are treated as annuals (pulled and replaced each growing season), but in areas that have mild winters, they may be able to survive the cooler months and re-emerge in the spring.

Harvesting Luffa
Depending on the species grown, the fruits on Luffa plants are either harvested for their edible qualities or for their rigid, fibrous interior structure that is used as a sponge. Fruits grow relatively fast, about an inch and a half each day, and each plant can produce between 4 and 6 fruits on average. To harvest edible fruits, make sure to pick them when they are still young and tender. They will be under six inches long, and can be eaten raw or prepared as other squash fruits are, added to stir fries, salads, used as a side dish, or made into soup. For harvesting Luffa sponges, wait until the fruits have fully developed on the vine. Skin will be yellow-brown, brittle, and covered with small brown spots. Keep an eye on the luffa plants so that they stay healthy and don't dry out while you are waiting for your Luffa sponges to develop.

Disclaimer: Information contained on this website is strictly and categorically intended as a reference to be used in conjunction with experts in your area. Foraging and consumption of plant parts should never begin without the guidance and approval of a local plant specialist. The providers of this website accept no liability for the use or misuse of information contained in this website.

Propagation

Luffa, or Loofah, plants are typically grown as annuals (though they are technically tropical-area perennials), and are best propagated through collecting and sowing seed.

Propagating Luffa by Seed

Keep in mind that the plant you get from seed will not necessarily mimic all of the characteristics of the parent plant. To propagate by seed, you will need a paper bag, a pot or tray filled with well-draining compost or other organic material, a spray bottle and a fork. The best potting medium for seed germination is a light blend of 1/3 pasteurized soil or compost, 1/3 sand, vermiculite or perlite, and 1/3 coconut coir or peat moss.
Harvest your seeds. The seed heads on plants are pretty easy to spot, they're left behind after flowers have faded. Once they have dried out and begun to split open, you can harvest the seeds inside. Cut them off of the plant, placing them in a paper bag. Harvest as many as you can, and place the paper bag in a dry, cool, dark area. They will continue to split open and release the seeds contained inside. Once they have been released, take them out of the bag and put them in a container so you can work with them.
Get your container prepared. Water your prepared seed tray or pot filled with soil, and ensure that good drainage is occurring. Place your seeds in your prepared pot or seed tray about 1/2 to 3/4 inches under the soil surface. Cover them with soil and water with your spray bottle. Place your tray of seeds in a warm area that receives bright, indirect light. A greenhouse is the most ideal climate, but a planting tray inside a window will do as well. Germination usually takes 14-21 days from sowing. Once you begin to see seedlings sprout and they are able to be handled, transplant them to their own individual 3-inch pots, filled with the same potting medium as described in Step 1. Loosen the seedlings from the potting medium by digging down with the tines of your fork about an inch and a half, gently working the seedling up until it is out. Then, replant the seedling in its individual pot.
Keep the seedling's potting medium moist, but not wet, by spraying the soil with your spray bottle. Keep your new plant in an area with bright light (though not direct sunlight) and temperatures between 65 and 72 degrees Fahrenheit. Ensure that the soil stays moist, but not wet, until the next spring (after the danger of frost has passed), when you can transplant it to its new home.

Luffa seeds are contained inside of mature fruits produced by vines.

Luffa seeds are typically flat and dark brown to black in color.

Problems and Pests

Certain Luffa species are considered invasive in some regions; see the species descriptions above for more information. Check with local authorities before planting. Luffa, or Loofah, plants are susceptible to developing issues with the following pests and diseases in the landscape: