A healthy plant exudes a vibrant green luster, whereas leaves and stems suffering from nutrient deficiencies change from green to various other colors. Nitrogen deficient plants produce yellow leaves, a sign of diminished chlorophyll production. Plants lacking phosphorous produce small, dark green leaves with purple veins, purple leaf stems, and purple-streaked stocks. When a plant lacks potassium, the leaves turn yellow, then brown and eventually die. Deficiencies in zinc, magnesium and calcium all cause color changes. Long story short it hard to tell at the moment. For me anyway sorry couldn't be more help