While most varieties of this bright beauty are annual sunflowers, meaning they will not come back the following growing season, they may self-germinate from dropped seeds if you leave the heads on the plants throughout the winter. The perennial Maximillian sunflower features small blooms in late summer and early fall.Click to see full answer. Correspondingly, do sunflowers grow back after cutting?When your sunflowers tend to grow too tall for your liking, giving them a trim encourages shorter, bushier growth. After blooming, sunflowers start to develop a ragged appearance, so it’s best to cut them down completely. Perennial varieties can grow back and flower again next year.Likewise, how long do sunflowers last? six to twelve days Regarding this, do sunflowers come back year after year? Sunflowers are either an annual (where they need to be replanted every year) or a perennial (where they will come back every year from the same plant) and telling the difference is not that hard if you know how. Annual sunflowers growing from reseeding will not start to show up until late spring.Do sunflowers spread? Growing Tips For Sunflowers Sunflower roots spread widely and can withstand some drought. However, it is best to water them regularly during their most important growth period which is about 20 days before and after flowering.