If you cut sunflowers back will they grow again?

Unlikely! They are annual plants and are grown anew each year from seed. They do not establish themselves like shrubs or bushes.

There are are no cultivation guidelines for sunflowers which recommend cutting back!

They are grown for their flowers and seeds. They grow very quickly from seed.

To ensure continuity of blooms during the flowering season, seed should be sown in succession, every fortnight for six weeks in the early part of the growing season.

If it is a good warm/hot summer, each cycle, from sowing to blooming, will only take about 60 days!

Enjoy!