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IN THIS ISSUE

Dear Organic Gardeners
Up close and personal in your garden's ecology...


Farm Report: June '04 Farm Tours are on 8/28 and 9/12...


Melons: The Dessert of the Garden Growing tips by Erica Renaud...


Product Specials
Beneficial insects and taking a closer look...

Ecology for Gardeners

Ecology For Gardeners
Book Review by Scott Vlaun...


David Holmgren Interview by Adam Fenderson...


Field Report Organic Cut flowers by Micaela Colley...


News & Views
Jesse Cool, Job Op, Farm Tour, Wangari Maathai, Permaculture...


Please send letters regarding this eNewsletter:
Scott Vlaun, Editor.


Melons: The Dessert of the Garden
by Erica Renaud, Research Farm Manager

Melon tasting.The obvious choice for a refreshing summer dessert from the garden is a juicy, ripe melon. Seeds of Change offers thirteen divine melon varieties to satisfy the melon gourmet or beginning gardener alike. Whether it's muskmelon, cantaloupe, casaba, crenshaw, or honeydew, melons range in flavor, sweetness, shape, size, color and skin firmness: all factors that might determine the gardener's selection. Fundamental to the development of any fine specimen is attaining the right level of fertility, employing optimal cultural techniques and knowing just when to harvest!

Botanical Description:
Melons are annuals with monoecious flowering characteristics (separate male and female flowers on the same plant) and extensive but relatively shallow root systems. Melon plant stems are ridged with simple tendrils and most cultivars are vining, although some bush-type cultivars are being developed. Male flowers form in clusters of three to five on thin peduncles (A primary flower stalk, supporting either a cluster or a solitary flower). Female and hermaphroditic flowers develop singularly, opening during the early morning and are insect-pollinated. Ultimately, plants produce many more flowers than become set as fruit, which makes hand pollination a very labor-intensive and inefficient way to ensure purity when growing more than one variety at a time if you are intending to grow melons for seed.

Melons are classified as a pepo, a fruit in which the ovary wall is fused with the receptacle tissue to form a hard rind or skin. Fruits are usually spherical or oval oblong with smooth, glabrous, (having no hair) surfaces. Some are deeply ridged, while others are covered with a reticulate (corky) netting. Flesh colors range from white to green, pink, or orange.

Origin:
Melons (Cucumis melo) predominantly originated from the desertland savanna regions of Africa and southwestern Asia and include cultivated, feral and wild populations. Wild strains occur in Africa from south of the Sahara to the Transvaal in South Africa and in Southwest Asia ranging from Asia Minor to Afghanistan. Melons are thought to come from Africa because there are wild forms there, though the earliest references to melons are from China. In the 11th century the Chinese began growing cantaloupes and honeydews that originated in western Asia. The name cantaloupe is mentioned as having originated from the city of Cantaluppi in Italy or from the estate and castle of Cantalupo, also in Italy.

Categories of Melons: Eel River Melon.

  • Muskmelons have pumpkin-like ribbing and skin covered with a netting of shallow veins. Flesh ranges from salmon to green. Seeds of Change varieties that fall under this category include: 'Blenheim Orange', 'Eel River', 'Hale's Best Jumbo', 'Harvest Queen', 'Imperial' and 'Rocky Ford'.
  • True cantaloupes, grown mostly in Europe, have orange flesh and rough, scaly skin with dark, distinct veins. Known for their superb gourmet flavor, they are dense, aromatic and extremely sweet. Seeds of Change offers a superb 'Charentais Cantaloupe' variety.
  • Winter melons (also a type of muskmelon), including honeydews, crenshaws, casabas and Persians, ripen as the weather starts to turn cool and will keep for 2-3 weeks if stored between 45 and 50 degrees at high humidity (95%). These larger, more oval fruits have waxy skins that can be smooth or wrinkled, with less fragrant flesh. They all require a growing season of over 100 days and are somewhat more susceptible to disease.
  • Casabas have wrinkled, golden skins and white flesh that stays sweet and juicy over a long period. Our 'Sungold Casaba'.is a classic example of this short season cultivar.
  • Large, round Persian melons have thick, orange or green flesh.. Our 'Haogen' was bred in Israel and has a sweet tangy flavor.
  • Honeydew melons typically have smooth, creamy white skins and lime green flesh. Our Swan Lake melon, a Seeds of Change original,.is an unusual variation on the classic Honeydew having white flesh with swirls of peach to pale salmon.
  • Crenshaws have salmon pink flesh with a distinctive flavor. The tenderness of their dark green skins make them difficult to ship.
Nutrition & Uses:
Swan Lake Melon.Melons are generally rich in vitamin C and also contain moderate levels of Potassium, Vitamin A and Folate. While they are mostly consumed around the world as raw fruits, melons are known to be cooked, pickled and preserved.

Chinese literature indicates that melons are used for cooling and as a diuretic. Melon aroma is due to the many volatile compounds, particularly alcohols, acids, and their esters formed during ripening. The amounts and ratios of these volatiles vary with the different C. melo groups, giving each its characteristic aroma and flavor. Extracts of melons are used as fragrances in cosmetics and for medicinal purposes. Melon seeds yield edible oils.

Propagation:
Melons can be either direct seeded for ease or transplanted to get a jump on the season. If direct seeding, direct sow in May or June after last frost when soil is warm, above 70°F (21°C), three or four seeds every two feet in rows at least four feet apart eventually thinning to one or two plants per spot.

If transplanting, start seeds indoors two to four weeks before transplanting, sowing in individual pots at least two inches wide. Seedlings should be hardened-off for one week prior to transplanting by slightly restricting water and exposing them to the outdoors under partial shade.

Cultural Techniques:
Melons are vigorous growers and should be grown in rows as discussed above or in "hills" of 2-3 plants spaced at least 3 feet apart. Ripening fruits should be turned regularly to avoid couche (spots lacking proper skin color) and potential for rotting. Plant spacing can be reduced if vines are grown on trellises, but fruits should be supported by netting to keep them from falling.

Any extra heat that can be provided through soil-warming mulches, windbreaks, or a sheltered site will generally result in a better outdoor crop, especially in cool climates. Slitted row covers over wire hoops make for excellent melon growing conditions however, the row covers need to be removed during the flowering stage to allow for insect pollination.

Fertility:
Melons require high nitrogen in the early stage of vine growth and require ample potassium and phosphorous in the flowering and fruiting stage, therefore applications of compost prior to harvest, sidedressing and/or foliar feeding during plant development are necessary. Feeding with Earth Juice Grow or Organic Gem Fish Fertilizer when vines are about 18 inches long and with Earth Juice Bloom during flowering, fruit set, and ripening stages will increase yields of ripe, flavorful fruit. Sandy soil is often preferred for melon growing, since it warms up more quickly and has sufficient drainage. Melons prefer moderately acid soils, (pH 6-6.5), but will generally tolerate soil pH ranges between 6-7.5

Irrigation:
Good soil moisture is important in early stages of growth and during pollination when fruits are setting. After this point, restrict water unless the soil is very dry and leaves begin to show signs of wilting during the heat of the day. Melon plants abhor wet feet (waterlogging) and soil compaction, which severely limits root growth.

Disease & Pests:
Striped cucumber beetles are a primary pest of melons, especially early in the season. Besides damaging the plants physically, they can spread diseases such as bacterial wilt and mosaic virus. Cucumber beetles can be easily controlled by using fabric row covers or by applying botanical insecticides like rotenone and/or pyrethrin. Sulfur is often used as an organic fungicide for powdery mildew control but cultivars will vary in susceptibility to damage from sulfur applications. Susceptible plants will exhibit varying degrees of foliar burn. Apply according to directions to a small section of your planting before treating an entire crop. If the soil is infected with nematodes or Fusarium. Be sure to rotate your melons to a new area every year. Other deseases that can affect melons include: Alternaria leaf spot, curly top, downy mildew, cucumber wilt and scab. See the The Organic Gardeners Handbook of Natural Insect and Disease Control for information on identifying and controlling these problems.

Harvest:
Charentais CantloupeMost melons mature within 80 to 120 days after planting. Melon ripeness is determined and/or defined by a complex interaction of sugar pH, texture, and volatile compounds. Most of their carbohydrates are sugars, not starch. The sweetness of the melon when you pick it is what you get - it doesn't get sweeter post-harvest. Melons start to ripen about 30 days after anthesis (flowering) and peak at about 42 days. Total sugars increase along with pH as melons ripen. Sweetness is noticeably missing in commercial melons picked unripe for shipping.
Some rules of thumb for ideal harvest are:
  • If the flesh texture is hard, the melon is underripe, while softness indicates over-ripeness;
  • Some melons abscise or slip from the vine when ripe; others don't abscise until they're overripe. When melons are at full slip, a crack completely encircles the stem;
  • Muskmelons should be harvested at full slip (the stem separates easily from the fruit) for best flavor. Many of the European Charantais varieties have to be harvested before slip to be at their best.
  • Inodorous melons, such as canary or casaba, lack smell, netting, abscission zone, or softening; and their ripeness is frustrating for the melon lover to decipher. Leave these on the vine as long as possible; be alert to minute cracks in the rind and very subtle color changes that signal maturity, and let frost be the indicator of the cut.

Quality Evaluation:
Total Soluble Solids (TSS) content of melon juice can be measured in degrees Brix with a handheld refractometer. Good quality melons generally have a TSS of 10% or more.

Eating:
Melons should be eaten when they begin to soften, but before they begin to break down. As a melon grows old, it loses flavor and ascorbic acid; it also develops stem-end cracks and water soaking of the flesh. Overripeness brings distasteful off-flavors and loss of color, sugars, and beta-carotene. A perfectly ripe melon is sweet, flavorful and nutritious.

Storage:
Cantaloupes and melons can be kept up to two weeks at around 45-50 °F (7-10°C) at high relative humidity 80 to 90%. Netted melons are best stored at slightly lower temperatures, 34-40 °F. (2-4 °C )

Studies conducted in Israel have shown that dipping melons in hot water at 125-130 °F (52-55°C) for 2 minutes can effectively control fungal rot.

Table 1:
Botanical variety classifications of cucumis melo fruit
, Naudin 1859

cucumis melo group:
cantalupensis netted muskmelon, cantaloupe, persian, and some lightly or non-netted cultivars
inodurus winter melon
flexuous snake or serpent melon, armenian cucumber
conomon oriental pickling melon
chito mango melon or vine peach melon
dudaim pomegranate or queen anne's pocket melon
momordica snap melon
agrestis wild type

References:
Goldman, A. (2002) Melons, for the passionate grower. Artisan, A Division of Workman Publishing Company, Inc. NY, NY.

Photo captions: (top)Melon tasting with Seeds of Change trial growers. (bottom) Eel River Melon

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