1.) When I plant an onion seed, does it produce 1 onion or many onions?
2.) Are my scallion seeds and my onion seeds the exact same thing?
3.) I have an onion in my cupboard that has several long stalks(?). If I plant it, will it produce another onion and/or onions?
3B) If so, do I plant the bulb in the ground and allow the stalks to protrude from the soil?

Thanks
These are scallions in Ohio, USA.

http://www.truestarhealth.com/Notes/Images/Food_Guide/Scallions.jpg

Planting herbs together with vegetables would reduce your production cost while increases your yield. 

Another term used in this method is called companion cropping or companion planting. It is an intercropping technique which involves planting two or more plants in one area for controlling pest attack. 

The plant species planted together in one area protects each other from insect pests by repelling the scent or color of each plant. 

Applying this technique, the insect pests would hardly locate their host plant, which resulted in your increased yield and reduced production cost especially for purchasing chemicals. 

What are the best herbs used as companion plants? 

Marigold. Planted thickly and turned into soil soil-borne diseases.  Oregano. Ward off cabbage white fly.  Tansy. Its strong scent drives ants, aphids and flies away.  Peppermint. Fends off ants and white cabbage moth.  Scallions, onions, garlic. Their strong odors repels aphids, fleas, and Japanese beetle.  Basil, catnip, coriander, marjoram, mint, parsley, thyme. When planted along vegetable plantation as companion crops repels different kinds of insect pests.  Garlic and onion. When planted together near cole crops and carrots, the vegetables would be less prone to insect attack.  Sweet basil, chives and flat parsley. When planted with head lettuce and pechay repels insects and increases yield.  Ocimum, purple basil, lemon basil. Repels insect pests of tomato and good as companion crops.  Chives. Is a good companion crop for lettuce.  Parsley. Is best to be intercropped with pechay. 

There are still some other herb plants that are good source as insect repellants. Stay tune, I will be giving you some updates as I happened to find in the next few days through my research. 

For the moment, if you happen to find these herbs in your locality, try to collect them in your nursery, multiply them so that you have an available plants ready as companion crops in your home gardening activities. 

Visit your agriculture store in your area and buy the seeds of these herbs and propagate them to have a continuous supply of companion planting materials once you starts planting your vegetables. 

Visit your friends’ garden and buy or ask these herbs once you see them in their backyard. 

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Cris Ramasasa, Freelance writer, writes about home gardening and Internet marketing tips. You can get a copy of his latest ebook “How to get started in Flower Gardening”and lots of tips, Free articles, and bonuses at: www.crisramasasa.com