Why flowers smell? what's the reason?

[En_lizard]

why some of them smell? what's the reason?

 

[Evo]

why some of them smell? what's the reason?

To attract insects, for pollination.

 

[En_lizard]

I mean how? what cause the smell?

 

[Ouabache]

Cause of the fragrance in flowers...

Scent in flowers is most usually produced in the petals. On the petals’ surface is a layer of cells, called epidermal cells. In these cells various types of fragrant oil are made, commonly known as 'essential oils'. The scent of each flower is chemically quite complex: for example, the clove scent of pinks is made up of about 60 different chemicals.

excerpt from http://www.millsfarmplants.co.uk/Scented_plants.htm