Domestic sunflowers (Helianthus annus) are annual plants, so they must be replanted every year. Other sunflower species, such as the Jerusalem artichoke (Helianthus tuberosus), are perennial plants and do not require replanting.
The common garden sunflower (Helianthus annuus) does not have a tap root, and must be replanted every year. Many wild species and some domesticated ones, such as the Jerusalem artichoke, do produce a tap root.
no they dont
Plants which grow from seed each year are called annuals.
Rhubarb and asparagus come back year after year, growing larger and larger and do not need to be replanted every year like other vegetables,
In many temperate areas, asparagus re-sprouts each year.
Pansies are an annual plant. You need to buy new ones every year.
A sunflower is an annual plant. Farmers replant it every year.
There are a couple of vegetables that are perennials and will come back every year, but for the most part vegetables are annuals that need to be replanted every year.
In most cases Sunflowers are annuals, so they grow from seed every year.
Chrysanthemums can be replanted.
Over 2.3 billion trees were planted in America last year. I'm not sure, but I think most of them were replanted by forest/logging companies.
Annuals are plants that need to be replanted every year. Perennials are plants that come up year after year on their own. Some are small, and some are not.