Artificial flowers is what flowers that are not real are called.
Specifically, the above-mentioned phrase is what most frequently is expressed and heard. But there are other possible designations. For example, flowers that are not real also may be called human made or synthetic.
You call a person who sells flowers a (Florist)
If you are looking for some brands for real looking fake flowers, one of the most popular brand of flowers is Floramatique. Real Touch is another common brand of fake flowers.
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Most delivered flowers are real. This answer would really depend on the florist, or store that you are referring to. In some cases the flowers could be plastic, only if you order plastic ones, otherwise they are real.
Yes you should. The person cared enough to get you flowers, so call to let them know you care and liked the appreciation and flowers!
Wreath , spray or bereavement flowers .
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A Cactus - it has a modified stem which produces flowers, but no leaves.
A florist.
The collective nouns for flowers are a bouquet of flowers and field of flowers. The term 'valley of flowers' is more of a description, but if it suits what you're trying to convey, use it and call it what you will.
A small bunch of flowers carried in the hand is a bouquet. Another word for a small bunch of flowers is nosegay or posy.
Dependent on if you want real flowers or plastic flowers or satin flowers you can find them wholesale from some flower markets where you can buy directly from sellers.