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IN THIS ISSUE

Dear Organic Gardeners
Reflections on climate change, wet, warm weather, and winter gardening...


A Green Winter Tips on growing windowsill salads throughout the winter...


Carrots The history, cultivation, and breeding of one of our favorite vegetables...


Chef Interview We talk with Karen Todd of The Dragonfly Café in Taos, New Mexico...
  


Farm Report: November '06 Putting the Farm to bed, seed cleaning, and winter building projects...


News & Views
The Sixth International Ecocity Conference (Ecocity6) in Bangalore, India ... Advances in the Cutting-edge Techniques of Genomics... An organic farmer in the Senate...


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

Carrots: Enjoyed By Kids of All Ages
by Steve Peters

Origin & History
A bunch of Japanese Imperial Long carrotsThe bright orange, sweet, and succulent carrot root that is grown and loved throughout the world is a far cry from its wild ancestor. Queen Anne's Lace (Daucus carota subsp. carota) is a small, woody, bitter root that is marginally edible, although the vegetative plant and flowers are quite similar to the cultivated carrot. Seeds of the wild carrot were found in European caves about 5,000 years ago, but it is unknown how these seeds or any other parts of the plant were used at that time. There are also vague references to carrot-like plants called staphylinos by the Greeks and pastinaca by the Romans more than 2,000 years ago, although these were probably genetically related plants, either parsnips (Pastinaca sativa) or skirret (Sium sisarium). The first actual written record that mentions carrots was around AD 1000, and comes from Arab merchants who brought carrots from Afghanistan into North Africa, then Spain, and eventually the rest of Europe.


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The roots came in a variety of hues, usually purple or yellow, and sometimes white, but never orange! The purple carrots were described as tasty and juicy, while the yellow ones were coarser and inferior in flavor. By the 13th century, carrots were grown in Germany and France. They were also cultivated at this time in India, China, and other regions east of their Central Asian origin. The European varieties were strongly biennial like the wild carrot (i.e., they required two years to produce seed) and were adapted to Mediterranean and temperate maritime-type climates. In contrast, the Indian and Chinese varieties were annuals (i.e., seed production in one year) and more adapted to tropical and subtropical environments.

The very first references to orange carrots were actually not written descriptions, but depictions in domestic scenes by some of the Northern European painting masters of the late 1500s. The carrots in these paintings were pale orange in color, but nevertheless orange, and clearly a departure from the common purple and yellow types. Throughout the 1600s, orange carrots became the preferred kind, while all other colors dropped out of favor, although there is no clear explanation for this phenomenon. The most obvious reason would seem to be that orange carrots have a superior flavor, but there is no proof of this. In fact, color and flavor traits are not genetically linked, and the only reason that orange carrots today are better tasting than other kinds is that they have essentially been the only ones grown and improved upon for the past 350 years. Perhaps more significant is that the color orange stood out more dramatically than other colors in the drab grayness of autumn when they were being harvested, and hence were more often replanted to produce the next year's seed crop. By the 1700s the Dutch dominated carrot breeding and genetic improvement, with the premier varieties being Early Half Long, Late Half Long, Scarlet Horn, and Long Orange. These early selections are the progenitors of most modern varieties and to this day, the Dutch continue to be the world leaders in carrot development.

Description & Varieties
The carrot (Daucus carota var. sativus) is a member of the Apiaceae plant family, which also includes dill, parsley, cilantro, celery, parsnip, fennel, and lovage. Formerly known as the Umbelliferae family, all of these plants produce multiple tiny flowers on a stalk that resembles an umbrella. There have been about sixty species of Daucus described worldwide, most of which have never been cultivated. The carrot is a biennial because it requires two years to form a flower stalk and produce mature seed, although it is primarily grown as an annual for its fleshy taproot, which accumulates starches and sugars.

Carrot varieties can be grouped into four major categories according to their shape and length:

  1. Nantes: These roots are medium long (5–8 in.), slender (~ 1¼ in.), and cylindrical with rounded tips. Good examples include Scarlet Nantes and Nantes Coreless.
  2. Chantenay: These roots are short-medium long (3–6 in.) with broad shoulders (~ 2 in.) and taper to a blunt tip. Good examples include Red Core Chantenay and Kurota Chantenay.
  3. Imperator: These roots are long (8–14 in.) with slender shoulders (~ 1½ in.) that taper slightly to a pointed tip. A good example is the Japanese Imperial Long.
  4. Danvers: These roots are medium long (6–10 in.) with broad shoulders (~ 2 in.) that taper to a distinctly pointed tip. Good examples are Scarlet Keeper and St. Valery.

Perhaps a more important criterion when choosing a carrot variety is the intended use. The primary uses for the home gardener would be for 1) fresh market, 2) cooking, 3) juicing, and 4) storage. Fresh-market carrots are crunchy and sweet with an exceptional carrot flavor when consumed raw. The Nantes and Chantenay types are the best for this use. Most varieties are suitable for cooking, which makes even somewhat bitter carrots palatable. Danvers types are best for cooking and their broad-shouldered roots are perfect cut into disks in a stew. The best juicing carrots are high in water content and lower in sugar than other types. High-sugar carrots tend to be too sweet as a juice. A great juicing variety is the Danvers-type Scarlet Keeper. Mature, topped carrots can be kept in storage without rotting for 4–5 months. Danvers and Chantenay types are the best for this purpose, with Scarlet Keeper and Red Core Chantenay being particularly good. Most of the commercial carrots are Imperator types because they have high fiber and hold up very well in the field, although their flavor is generally not as sweet as the other types.

Culture
Nantes Coreless carrotsCarrots prefer moderate temperatures, 60–75°F, for optimum growth, flavor, and nutritional quality. Prolonged colder temperatures decrease carotene production and hence the carrots are paler in color, whereas high temperatures result in excessive lateral roots and bitter flavor. They grow best on deep, well-drained loamy soils with a pH of 5.5–7.0. Avoid stony ground, which produces misshapen roots, and heavy, wet soils, which produce excessive leaf growth and forked roots. Good soil fertility is important, but do not over apply nitrogen-rich animal manure, which may result in hairy, forked roots.

Always direct seed carrots. Plant from early spring through midsummer, sowing your last crop 80–90 days before the first fall frost date. After seeding, cover with 1/8–3/8 inch of soil. The roots will form the best shape when plants are spaced 1–2 inches apart. The seed, however, is small and difficult to distribute evenly, which often leads to a crowded plant stand. This can be remedied by hand thinning the stand when the green tops are still very small, i.e., less than 1 inch tall. If thinning is not done until the tops are much larger, the resulting roots will be deformed. One technique for creating a more even stand is to mix the carrot seed with sand, and then direct seed. Thinning will still probably be necessary, but the stand will be less crowded. Another technique, which can eliminate almost all thinning, is to bake a significant portion of the seed (perhaps 50%) in the oven at greater than 100°F, which destroys the germ. Then, mix this non-fertile seed with your good seed and plant directly. Carrot seedlings grow quite slowly during the first few weeks and can get overrun with weeds; therefore, it is important to weed early in the season, at the same time that you are thinning the carrots.

Oxheart carrotsCarrots thrive when they receive a steady supply of water throughout the season. The amount of supplemental water via irrigation depends upon the climate, soil type, and the amount of water in the soil at planting. The soil should be moist but not wet. If the soil alternates between wet and dry, cracking of the roots may occur. Several types of watering systems can be used, including overhead sprinkler or drip or flood irrigation.

Harvesting can begin when root diameters are 3/4 inch or larger at the upper end. Wash roots thoroughly and enjoy immediately. If extended storage is desired, remove excess soil from the roots but do not wash. Then, clip the green tops to 1/2 inch long and store in moist sand at 32–34°F. A much easier storage method is to keep the carrots in the ground, but a 6–12 inch layer of straw mulch is recommended to avoid exposing the roots to freezing winter temperatures.

Nutritional Powerhouse
Carrots are truly one of nature's wonder foods. Not only are they universally relished for their delicious flavor and satisfying crunch, but they provide a wide range of health benefits. For starters they are rich in certain phytochemicals known as carotenoids, which are biologically active compounds that promote general good health and enhance the immune system. The most important carotenoid is beta-carotene, which is present in many orange yellow foods, including pumpkin, corn, yams, and apricots, but which is especially concentrated in carrots. Our bodies convert beta-carotene into vitamin A, which strengthens the immune system and promotes healthy skin, lungs, intestines, and many other vital organs. Beta-carotene that is not converted to vitamin A is a powerful antioxidant that slows the aging process and helps prevent degenerative diseases such as cancer, arthritis, heart disease, and cataracts. Also very important is alpha-carotene, which, while not as concentrated as beta-carotene, has been reported to be more effective in inhibiting the growth of cancerous tumors. Carrots are also rich in thiamine, riboflavin, and vitamin C. Interestingly, the best way to consume carrots for maximum carotene absorption is as carrot juice or lightly cooked in a stir-fry. Cooking partially dissolves the fibrous cell walls of a carrot, which enables our body to absorb more carotene—although, for the true carrot lover, there is nothing finer than munching a raw carrot straight from the garden.

Steve Peters
Commercial Seed Manager


Photo Captions: (1) Japanese Imperial Long carrots (2) Nantes Coreless carrots. (3) Oxheart carrots.

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