Zinnia flowers are one of the easiest plants grow. They grow quickly, and their prolific, bright flowers bloom in vivid or even neon shades from mid-summer to fall. They make a massive burst of color in your garden and they attract butterflies. They also don't need much care, just simple weeding. Pinching spent blossoms encourages new blooms. Zinnias make beautiful border plants and cut flowers. Zinnia helps cure constipation and the extracts are used in many beauty products.