Like creating any other piece of art, a perfect flower arrangement requires to follow certain rules to create a masterpiece.

The basic rules of flower arranging are:

There’s nothing more pleasing than a beautifully balanced flower arrangement. The perfect arrangement of flowers is the one with the right balance. This means that the height of the arrangement should be at least one and a half times more than the height of the container. Although the height of the arrangement can be higher than this, it is never lower.

The material used for the flower arrangement should complement each other. The flowers, foliage, colour, container and all other accessories should be of one theme and nothing should seem out of place.

Rhythm guides the eye to admire the entirety of the flower arrangement. The perfect rhythm is achieved when all the details are highlighted and noticed in a beautiful pattern.
The best way to achieve the flow or rhythm is to give a three dimensional look to the arrangement instead of a two dimensional look. Flower heads should be placed at different levels so that no flower gets left behind and all of them can together enhance the beauty. This makes it easier to notice all the details in the arrangement in a beautiful pattern.

The theme and colour of the arrangement depends entirely on the occasion. The colour of the arrangement should be appropriate for the occasion and match the surroundings.
The best way is to go for complementing colours as per the occasion.
Different colours reflect different moods.
For celebrations and joyous occasions, you can go for the cheerful yellow colour. Likewise, for romantic occasions you can go with vibrant red.

Flowers and foliage can come in different textures. You can either go for the same texture for the entire bouquet or carefully choose different textures that complement each other. Using different textures can give variety to the arrangement.
Some occasions call for extravagant flower arrangements. And sometimes, the simplest arrangements have the biggest impacts.
The key is to make sure that all the elements complement each other and enhance the beauty of the entire place.