Plants can flower regardless of whether they are perennial or annual, so no, blooming does not automatically make a sunflower a perennial.
Yes, dahlias are perennial plants that bloom year after year.
sunfolwer bloom durning the summer
Geraniums(Pelargoniums) are perennials therefore given the right conditions will flower constantly.
Typical sunflowers that are planted are annuals; however, there is a newer crop being developed called "perennial sunflowers."
Up to the height of a house!
the plant is perrinial. however, they only bloom about twice in the springtime.
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 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.
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.
A balsamroot is a perennial of the genus Balsamhorhiza in the sunflower family, native to western North America.