Plants can flower regardless of whether they are perennial or annual, so no, blooming does not automatically make a sunflower a perennial.
sunfolwer bloom durning the summer
Geraniums(Pelargoniums) are perennials therefore given the right conditions will flower constantly.
Up to the height of a house!
Typical sunflowers that are planted are annuals; however, there is a newer crop being developed called "perennial sunflowers."
With the exception of Jerusalem artichokes, all domesticated sunflower varieties are annuals. There are a few wild species that are perennial.
The oxeye sunflower (Heliopsis helianthoides) is also called false sunflower, rough heliopsis, hardy zinnia and orange sunflower. This 3-5 foot plant is a perennial of the sunflower genus, which looks more like a yellow daisy than a sunflower.
If by "open up" you mean "bloom", then yes.
The type of flowers that bloom every year without replanting includes perennial flowers. Roses, Plumbago, and hibiscus flowers are all examples of those perennial flowers.
The sunflower (Helianthus annuus) is an annual plant, but the term "sunflower" is also used to refer to all plants of the genus Helianthus, many of which are perennial plants.
A balsamroot is a perennial of the genus Balsamhorhiza in the sunflower family, native to western North America.
the plant is perrinial. however, they only bloom about twice in the springtime.
If the winter has been relatively wet, they may bloom in the spring. Others may wait for the summer monsoon season to grow and bloom.