How to Grow Fennel

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1-10-2016, 11:00
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Growing fennel is a wonderful way to add spice to recipes using home grown ingredients. The pungent aroma is considered inviting, while the rich, earthy flavor is known to significantly contribute to the taste of many dishes. Fennel is high in vitamin C and has been used as an herbal remedy for digestive issues for many thousands of years. In addition, its delicate, green fronds are aesthetically pleasing, making fennel an excellent addition to any garden. Start with Step 1 below to learn how to grow fennel.

Planting Fennel

  1. Choose a fennel variety. The type of fennel you choose to grow will depend on what part of the fennel plant you wish to use -- the bulb, the fronds or the seeds.
    • Florence Fennel is grown for its bulbous stem, which can be eaten raw, grilled or baked. It is also possible to eat the thicker stalks which sprout from the bulb, as they are similar to celery.
    • Herb fennel does not produce the same bulbous stem. It is grown for its delicate leaves, which are used as a herb. Herb fennel also produces seeds which have a licorice-like flavor (as does the rest of the plant) and are used for seasoning.
  2. Plant the fennel outdoors. The process for planting both varieties of fennel is the same. The seeds should be planted directly into the garden, around the time of the last spring frost.
    • Plant the fennel seeds in fertile, well drained soil. If necessary, loosen the soil a little before planting and add in some compost and a little soil for drainage.
    • Plant the seeds approximately ten inches apart and cover them with a light layer of soil, about ⁄8 inch (0.3 cm) deep. It's probably a good idea to plant a few more seeds than you need, then thin them out later.
    • Plant the fennel far away from any dill or coriander -- these plants tend to cross-pollinate, which reduces seed production and affects the taste.
  3. Plant the fennel indoors. If you prefer, you can plant the fennel seeds in containers approximately 4 weeks before the last spring frost.
    • Once the seedlings have grown to height of 3 or 4 inches (7.6 or 10.2 cm), you can harden them off in a cool greenhouse or cold frame before transplanting them to the garden.
    • Alternatively, you can keep the fennel in a container. As fennel is a deep-rooted plant, it will require a container at last 12 inches (30.5 cm) deep, filled with light soil with some added gravel for drainage.
    • If you plant more than one fennel plant in a container of this size, it will be too crowded to produce a large bulb, but you will still be able to enjoy the leaves and seeds.
  4. Care for the fennel. Fennel grows best in full-sun or partial shade and should be watered regularly to keep the soil moist. Be careful not to overwater though, as this may cause the roots to rot. There is no need to fertilize the soil during growing season.
    • Once the bulb begins to form at the base of the stem, hill up the surrounding soil to cover it. This shades it from the sun and prevents it from turning green. This is known as "blanching", as it keeps the bulb white and sweet (which is only necessary if you intend to eat the bulb).
    • Fennel is not usually affected by pests or disease, but occasionally you will spot aphids or whiteflies on the leaves. If so, you can use a pyrethrin-based insecticidal soap to get rid of them.

Harvesting Fennel

  1. Harvest the fennel leaves. You can start harvesting the fennel leaves once the plant becomes well-established.
    • Don't take too many leaves at once though, or you might harm the plant.
    • The fennel leaves can be used to add an aromatic, anise flavor to soups, salads and other Mediterranean-style diets.
  2. Harvest the bulb. Florence fennel bulbs can be harvested once they reach the size of a small tennis ball, usually in late summer/early autumn.
    • To harvest, cut the fennel below the bulb at the soil line. Use immediately, or store in the refrigerator for several days.
    • Fennel bulbs will survive a frost or two, so there is no rush to harvest them as soon as the weather turns cold. However, you shouldn't allow the fennel bulb to grow too large, or it will turn bitter.
  3. Harvest the fennel seeds. Fennel seeds can be harvested as soon as they're ripe and the plant's flowers have turned brown.
    • The seeds are very loose, so the best way to collect them is to place a large bowl or sheet underneath the plant and shake the seed head. Alternatively, you can wrap the seed heads with cheesecloth while you're cutting the stalks and remove the seeds later.
    • Allow the seeds to dry completely, then store them in a cool, dark place in an airtight container. They will keep for up to six months.
  4. Leave the fennel to grow as a perennial. Fennel grows as a hardy perennial between zones 5 and 10. It self-sows very easily, so if you have planted it once, it is likely to re-emerge the following spring.
    • Every spring, you should fertilize your fennel patch with a standard fertilizer, or nourish the soil with some fresh (preferably homemade) compost.
    • However, in northern zones (or areas where winter temperatures regularly drop below 15 degrees F/ -10 degrees C) fennel should be treated as an annual and will need to be replanted each spring.

Tips

  • Consider an exclusive patch for your fennel as it is known to impede the growth of other plants.
  • Fennel plants can be started from cuttings. Once a plant matures, the roots can be snipped and replanted.
  • Be sure not to start your plants where any coriander, caraway or wormwood is growing as these will impede the fennel's growth.
  • Fennel can be an integral part of an expectant or nursing mother's diet, as nutrients that are exclusive to this plant aid in milk production.
  • Plant your fennel during the fall in warm climates, and during the spring in cooler places.
  • Verify that your soil's pH level is between 6.0 and 7.0 as fennel grows best in less acidic soil.
  • Fennel can grow up to five feet tall, which leaves the thin stems susceptible to breakage. Stake your fennel to support it against the wind.
  • To thresh the seeds, slap the stalk against a hard surface.
  • Creating your own compost will maintain the organic integrity of your plants, and is a wonderful way to benefit the environment.
  • Mix any additives into the soil in advance, making certain that it has time to neutralize before planting season.
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