Stages of Plant Growth on Chalkboard

minimal chalkboard illustration of plant growth stages, four small green leafy sprouts increasing in height from left to right, thin pale yellow horizontal baseline and vertical axis like a simple growth chart, hand-drawn chalk texture, bright lime green leaves with subtle yellow highlights, dark black slate background with dusty grain and faint scratches, clean centered composition with lots of negative space, educational botanical concept, rustic classroom blackboard aesthetic, simple organic shapes, no text, no watermark