HOW TO GROW PEANUTS
Once called 'goober peas' in the United States, peanuts are a very popular snack food. They are most often eaten roasted on their own, as opposed to many other nuts that are used more in cooking. They are easily shelled by hand, which adds to their appeal.
However, peanuts do not look like most regular nuts - and there is a good reason for that. This is because peanuts are fairly unique in the nut world, as they grow underground and - unlike most other nut varieties - are not produced by large trees.
What is a peanut?
The peanut is a small annual herbaceous plant that grows to 30-40 cm tall. It produces a typical peaflower flower which is usually yellow with reddish veining.
Weirdly, once pollinated the flower stalk will begin to bend until the fertilized ovary touches the ground. However, the stalk continues to grow and pushes the ovary underground! The ovary continues to develop into a legume pod which matures into what we commonly call a peanut. Each pod can be between 1-3 inches long and containing as many as 4 ‘seeds’.
How to grow peanuts
Given their long growing season, you may want to get your peanut plants started early indoors. Use paper or peat pots as can reduce root shock when it comes to transplanting. You will need pots that are 3-4 inches in diameter so if you cant find biodegradable pots at this size them use plastic instead.
Start your seeds 3 or 4 weeks before you expect your last frost date. Using a good quality compost such as John Innes 'Seed and Potting' , plant 2 or 3 seeds in each pot, and covered them with 2 inches of compost soil. Keep them well watered, but don’t have the compost waterlogged as this will damage the juvenile root system.
Once the peanut seeds begin to germinate, remove the weakest leaving just one strong peanut plant per pot. Your peanuts or seedlings should be planted outside into their final position once there is no more threat of frost.
Planting peanuts outside
As it grows, your peanut plant will produce runners, and each one will eventually grow a peanut at the end underground. These runners start out as the above-ground flowers. So once you see the plant’s flower starting to wilt and bend down, do not pick them off. That’s where the next generation of peanuts will be produced. Those downward growing stems are commonly known as “pegs”
When you see your plants starting to grow their pegs, lightly dig around the plants in order to loosen up the soil. The peg needs to grow down underground so you don’t want it blocked by stones or compacted soil.
Once your plant has set down its pegs, do not cultivate or weed to roughly around the plant or you could accidentally pull up or break off a runner. Mulching can help keep the weeds down, but do not add mulch until the pegs have moved down into the soil.
You will want to water your plants frequently, but avoid giving them too much water at once. Fertilizing is fine though not really necessary. Use a low-nitrogen formula or you will end up with very bushy plants and no peanuts. When the plants begin to flower, a treatment with a calcium-rich fertilizer can help with nut formation.
Growing peanuts in containers
Keep your plants well-watered but take care not to let the roots get waterlogged. It is important that your containers are well drained.
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Images care of http://www.ars.usda.gov/research/docs.htm?docid=16816&page=3 and http://www.hort.purd and http://www.flickr.com/photos/bigthirstytowels/861355703/ and http://howdopeanutsgrow.com/ and http://honolulueats.wordpress.com/2009/11/15/peanuts-%E8%90%BD%E8%8A%B1%E7%94%9F/
Based on an article from http://www.gardeningblog.net/how-to-grow/peanuts/