Adjusting the gradient of green leaves in graphic design or photography involves selecting and blending different shades of green to create a smooth transition. You can use image editing software like Adobe Photoshop or GIMP. Start by choosing a gradient tool and select two or more green shades that represent the light and dark areas of the leaves. Apply the gradient to the leaves by dragging the tool from the lighter to the darker shade. Fine-tune the gradient by adjusting the opacity and blending modes to achieve the desired effect.