Which color may indicate phosphorus deficiency in plants?

Phosphorus deficiency in plants is often indicated by a purple coloration, particularly in the leaves and stems. This happens because phosphorus plays a key role in photosynthesis and energy transfer within the plant. When there is insufficient phosphorus, the plant struggles to create the necessary compounds for growth, leading to stunted development and atypical coloration. The purple hue arises due to a buildup of anthocyanin pigments, which can occur as a plant's response to stress related to nutrient shortages, especially in cool temperatures or when the soil pH is not optimal for nutrient uptake. This contrasts with the other colors: yellow is typically linked with nitrogen deficiency, pale green might indicate a lack of various nutrients, and brown often suggests overwatering or root rot rather than a specific nutrient deficiency. Thus, purple is a clear and distinct indicator of phosphorus deficiency.