how tall sunflowers grow
Although miniature sunflower varieties are about 2 feet tall, and giant varieties can grow over 10 feet tall, standard sunflowers are usually between 6 to 10 feet in height.Depending on the variety, sunflower plants started from seed can mature in 70 to 100 days.unflower Growth. After the seeds sprout, the plants will need space to grow. Thin giant varieties 4 feet apart, miniature varieties 1 foot apart, and standard varieties 3 feet apart. About 33 days after germination, the flower heads will appear.