How tall are sunflower stems?
How tall are sunflower stems? Recommended Varieties Everyone is familiar with the huge sunflowers that grow on towering eight-foot-tall stalks. But did you know that some varieties top off at a modest 15 inches? The towering 'Mammoth' variety is the traditional giant sunflower, sometimes growing to more than 12 feet tall. What makes sunflowers grow tall? To grow sunflowers you need a sunny, sheltered spot and a good soil – add plenty of well-rotted manure or garden compost before planting, if you can. Keep your sunflowers well watered and feed weekly to encourage them to grow tall. What happens if...