Mature sunflower plants and corn are similar in height, as both can reach 5 to 12 feet (depending on the sunflower variety). As it is, sunflowers won’t block sunlight from young corn plants as they grow together. Note that both sunflowers and corn need six to eight hours of unfiltered sunlight a day. As for soil conditions, sunflowers and corn are compatible because they have different needs. While sunflowers thrive in well-drained soil, corn requires moisture, especially in its early stages of germination.
But the benefits of this pairing don’t stop there. Sunflowers can also act as a windbreak for a corn patch. With their robust stems and large leaves, sunflowers create a buffer against strong winds that might otherwise bend or damage the more delicate corn stalks. This protection is especially valuable in regions prone to gusty weather.
Moreover, the dense canopy of sunflowers provides another significant benefit: weed suppression. The sunflowers’ broad leaves create a natural mulch layer that shades the soil underneath, making it less inviting for weeds to take root. Sunflowers also release allelopathic compounds that are useful for natural weed control. As a result, your corn and sunflower patch will require less weeding, saving you time and effort.