Banana Fruit
Banana Fruit

Banana is the common name for an edible fruit produced by several kinds of large herbaceous flowering plants of the genus Musa. The fruit is variable in size, color and firmness, but is usually elongated and curved, with soft flesh rich in starch covered with a rind which may be yellow, purple or red when ripe. The fruits grow in clusters hanging from the top of the plant. Almost all modern edible parthenocarpic (seedless) bananas come from two wild species – Musa acuminata and Musa balbisiana. The scientific names of most cultivated bananas are Musa acuminata, Musa balbisiana, and Musa  paradisiaca for the hybrid Musa acuminata  M. balbisiana, depending on their genomic constitution. The old scientific name Musa sapientum is no longer used.

Musa species are native to tropical South and Southeast Asia, and are likely to have been first domesticated in Papua New Guinea.They are grown in at least 107 countries, primarily for their fruit, and to a lesser extent to make fiber, banana wine and as ornamental plants.

Worldwide, there is no sharp distinction between “bananas” and “plantains”. Especially in the Americas and Europe, “banana” usually refers to soft, sweet, dessert bananas, particularly those of the Cavendish group, which are the main exports from banana-growing countries. By contrast, Musa cultivars with firmer, starchier fruit are called “plantains”. In other regions, such as Southeast Asia, many more kinds of banana are grown and eaten, so that the simple two-fold distinction is not useful and is not made in local languages.

The term “banana” is also used as the common name for the plants which produce the fruit. This can extend to other members of the genus Musa like the scarlet banana (Musa coccinea), pink banana (Musa velutina) and the Fe’i bananas. It can also refer to members of the genus Ensete, like the snow banana (Ensete glaucum) and the economically important false banana (Ensete ventricosum). Both genera are classified under the banana family, Musaceae.

Statistics on the production and export of bananas and plantains are available from the Food and Agriculture Organization. Some countries produce statistics which distinguish between bananas and plantains, but three of the top four producers (India, China and the Philippines) do not, so comparisons can only be made using the total for bananas and plantains combined. The 2011 statistics (see Table 1) show that India led the world in banana production, producing around 20% of the worldwide crop of 145 million metric tonnes. Uganda was the next largest producer with around 8% of the worldwide crop. Its national data does distinguish between bananas and plantains, and shows that the latter made up over 95% of production. Ten countries produced around two thirds of the total world production.

Broad, long, graceful leaves and rapid growth-commonly reaching full size in just a few weeks-make banana a favorite plant for providing a tropical look to pool and patio areas. The development of bananas following a frost-free winter is a source of both pride and amazement to those unfamiliar with banana culture.

Banana is a tropical herbaceous plant consisting of an underground corm and a trunk (pseudostem) comprised of concentric layers of leaf sheaths. At 10 to 15 months after the emergence of a new plant, its true stem rapidly grows up through the center and emerges as a terminal inflorescence which bears fruit.

The flowers appear in groups (hands) along the stem and are covered by purplish bracts which roll back and shed as the fruit stem develops. The first hands to appear contain female flowers which will develop into bananas (usually seedless in edible types). The number of hands of female flowers varies from a few to more than 10, after which numerous hands of sterile flowers appear and shed in succession, followed by numerous hands of male flowers which also shed. Generally, a bract rolls up and sheds to expose a new hand of flowers almost daily.

Banana is a tropical plant which grows best under warm conditions. Frost will kill the leaves; temperatures in the high 20s can kill the plant to the ground. In the lower Rio Grande Valley and other protected areas, the plant will regrow from below ground buds. In colder areas where banana is used mostly as an ornamental, new plants are obtained and planted each spring.

The leaves are tattered badly by strong winds, rendering the plant less attractive. Strong winds, in conjunction with saturated soil and the weight of a stem of fruit, can result in significant blow down unless guying or other protection is provided.

Soil and Site Selection

Banana grows in a wide variety of soils, as long as the soil is deep and has good internal and surface drainage. The effect of poorly drained soils can be partly overcome by planting in raised beds, as the plant does not tolerate poor drainage or flooding.

The planting site should be chosen for protection from wind and cold weather, if possible. The warmest location in the home landscape is near the south or southeast side of the house.

There are numerous named varieties and several unnamed types. For purely ornamental use, both unnamed seedy types and named varieties will suffice. Most are tall-growing and have green leaves, but ‘Dwarf Cavendish’ only reaches about 6 feet in height, and there is a mottled or splotchy red-leafed ornamental which can sometimes be located in the nursery trade.

From the standpoint of fruit production, ‘Orinoco’ or ‘Horse’ banana has a coarse-looking fruit about 6 inches long by 2 inches in diameter that is primarily used in cooking. ‘Dwarf Cavendish’ is a short, compact variety that produces fruit typical of those in the supermarket. Because of its size, wind damage is less severe.

‘Lady Finger’ is a standard-size plant which bears thin-skinned fruit about 1 inch in diameter and 4 inches in length. Its flavor is superior to supermarket bananas.

‘Apple’ or ‘Manzana’ is very similar to ‘Lady Finger’ in all respects except that its fruit imparts an aftertaste very much like the taste of a fresh apple.

Plantains are cooking bananas, but they apparently are not available in South Texas. Other varieties which may be found in the nursery trade include ‘Cavendish’, ‘Ice Cream’ and others.

Propagation and Planting
Suckers are used for propagation, being taken when they have a stem diameter of 2 to 6 inches. The leaves are commonly cut off in nursery trade, but decapitation at 2 to 3 feet is satisfactory. The sucker should be dug carefully, using a sharpshooter or spade to cut the underground base of the sucker from the side of its mother rhizome. Large suckers can be decapitated at ground level and halved or quartered (vertically) to increase planting material.

Nurserymen transplant from the field into containers for retail use, so planting these bananas is much the same as planting any container-grown plant. Sucker transplanting should be at the same depth as the sucker was growing originally.

For ornamental purposes, bananas may be planted as close as 2 to 3 feet apart, but those planted for fruit production should be spaced about 8 to 10 feet apart.

Weed and grass competition should be eliminated prior to planting. Mulching is useful to prevent weed regrowth, but turfgrass may need to be controlled by hoeing or with herbicides.

Irrigation should be applied periodically to thoroughly wet the soil. Avoid standing water, as bananas do not tolerate overly wet conditions.

Fertilization requirements under Texas conditions have not been researched. However, it is reasonable to presume that nitrogen will be the only limiting nutrient in most situations. For new plants, one quarter cup of ammonium sulfate (21-0-0), watered in, after the plant commences regrowth should be applied monthly for the first three to four months. The rate can be increased over time to two cups per month when fruiting begins.

Established plantings of several plants together should receive about two cups of ammonium sulfate every couple of months throughout the year.

Cold protection of the top is possible by use of coverings and heat sources, but such is not often practical. However, in colder locations, soil can be banked around the trunk just before a projected cold spell to better protect the underground buds, which will allow the plant to regenerate in the coming spring. Unprotected but well-established bananas across South Texas, with some exceptions, regenerated after both the ’83 and ’89 freezes.

Some people dig the entire plant, rhizome and all, remove the leaves and store the plant, dry, in a heated area over winter. To assure survival, it is easier to dig small suckers, severed very close to the parent rhizome, and pot them for overwintering indoors.

Pruning is normally practiced only to provide suckers for propagation, as most banana plantings are allowed to grow freely in mats of several plants of varying age and size. For fruit production, some pruning would be desirable to limit the number of plants per mat to 5 or 6. Suckers can be quickly dispatched with a sharpshooter or machete when they are only a few inches tall; however, the sucker must be severed from its mother plant underground.

After fruiting, the mother plant which bore should be cut off near ground level, as it can never produce again. The old trunk will quickly decompose if cut into three or four pieces, with each piece then being split lengthwise. Use the remains in a mulch bed or compost heap.

After a major cold period in which there is no doubt that bananas were killed to the ground, cut the plants off at ground level within a couple of weeks of the freeze. Dead bananas are not very attractive and they are much easier to cut off before decomposition starts.

Tattered older leaves can be removed after they break and hang down along the trunk.

Production, Maturity and Use
Most bananas will produce the flower bud within 10 to 15 months of emergence as a new sucker, depending mostly on variety and extent of cool/cold weather. Most production north of the lower Rio Grande Valley occurs in the spring and summer following a particularly mild winter.

The reddish purple bracts of the flower roll back and split to expose a hand of bananas, usually at the rate of one per day. After all hands with viable fruit are exposed, the bracts continue to roll back and split for several weeks, leaving a bare stem between the fruit and the bud. There is no advantage to leaving the bud longer then necessary; it may be broken off a few inches below the last viable hand of fruit.

Well-tended bananas in commerce produce fruit stems approaching 100 pounds, but such yields are rare under Texas conditions. The more delicately flavored, small-fruited varieties may attain stem weights of 35 to 40 pounds. Most Texas producers readily accept production of stems having only two or three hands, although six to eight hands per stem is common for well-tended plants.

Bananas do not always attain best eating quality on the tree. The entire stem (bunch) should be cut off when the individual bananas are plump (full) and rounded. Although green in color, the fruit is mature and will ripen to good eating quality. The stem of fruit should be hung in a cool, shaded place to ripen. Ripening will proceed naturally in a few days (if properly harvested), but can be hastened by enclosing the bunch in a plastic bag with a sliced apple for about a day. Once ripening starts on the oldest hand, the entire bunch will ripen within a couple of days.

Ripe bananas are consumed fresh out-of-hand, in salads, compotes, ice-cream dishes and pudding. Overripe fruit can be pureed in the blender for use in ice cream and baking. Both dessert and cooking bananas may be fried or baked, but the cooking bananas are generally more starchy until nearly spoiled ripe, and their fresh flavor is not so good. Green (mature but not ripe) bananas and plaintains can also be sliced thinly and fried for a starchy treat.

Disease and Insect Pests
Bananas in commerce are subject to a number of serious diseases and pests, but few problems have been documented in South Texas. An unidentified fungal leaf spot has been observed, but no serious damage has resulted. Leaf tattering by wind is the most common problem.

Food and cooking

Bananas are a staple starch for many tropical populations. Depending upon cultivar and ripeness, the flesh can vary in taste from starchy to sweet, and texture from firm to mushy. Both the skin and inner part can be eaten raw or cooked. The banana’s flavor is due, amongst other chemicals, to isoamyl acetate which is one of the main constituents of banana oil.

During the ripening process, bananas produce a plant hormone called ethylene, which indirectly affects the flavor. Among other things, ethylene stimulates the formation of amylase, an enzyme that breaks down starch into sugar, influencing the taste of bananas. The greener, less ripe bananas contain higher levels of starch and, consequently, have a “starchier” taste. On the other hand, yellow bananas taste sweeter due to higher sugar concentrations. Furthermore, ethylene signals the production of pectinase, an enzyme which breaks down the pectin between the cells of the banana, causing the banana to soften as it ripens.

Bananas are eaten deep fried, baked in their skin in a split bamboo, or steamed in glutinous rice wrapped in a banana leaf. Bananas can be made into jam. Banana pancakes are popular amongst backpackers and other travelers in South Asia and Southeast Asia. This has elicited the expression Banana Pancake Trail for those places in Asia that cater to this group of travelers.

Banana chips are a snack produced from sliced dehydrated or fried banana or plantain, which have a dark brown color and an intense banana taste. Dried bananas are also ground to make banana flour. Extracting juice is difficult, because when a banana is compressed, it simply turns to pulp. Bananas feature prominently in Philippine cuisine, being part of traditional dishes and desserts like maruya, turrón, and halo-halo. Most of these dishes use the Saba or Cardaba banana cultivar. Pisang goreng, bananas fried with batter similar to the Filipino maruya, is a popular dessert in Malaysia, Singapore, and Indonesia. A similar dish is known in the United States as banana fritters.

Nutrition and research
Bananas are an excellent source of vitamin B6, soluble fiber, and contain moderate amounts of vitamin C, manganese and potassium. Along with other fruits and vegetables, consumption of bananas may be associated with a reduced risk of colorectal cancer and in women, breast cancer and renal cell carcinoma. Banana ingestion may affect dopamine production in people deficient in the amino acid tyrosine, a dopamine precursor present in bananas. Individuals with a latex allergy may experience a reaction to bananas

The information given herein is for educational purposes only.


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