A wide website hero header illustration in soft watercolor style, designed as a non-repeating background. The composition should transition vertically from a rich, darker green and slightly moody top area into a clean bright white bottom area, creating a natural fade for easy overlay of webpage content without repeating the background. Keep delicate watercolor botanicals inspired by lush forest foliage, with leafy branches, ferns, grasses, and soft plant silhouettes framing the edges and corners, especially along the top and sides, while the center remains open and airy. Use elegant layered washes, subtle texture, gentle organic shapes, and a calm fresh natural atmosphere. The bottom should be mostly white with only faint hints of watercolor wash, and there should be no text, no people, no buildings, and no hard borders. Modern, clean, peaceful, high-detail watercolor illustration suitable for a web header.