Micronutrients such as calcium, magnesium, and iron are equally important and often underestimated by beginner growers. Calcium strengthens cell walls and supports rapid growth, while magnesium is essential for chlorophyll production and photosynthesis efficiency. Cultivators of jack herer autoflower seeds frequently encounter magnesium deficiencies under high-intensity lighting, so supplementing with Cal-Mag solutions throughout the grow cycle is a widely recommended practice to prevent yellowing leaves and nutrient lockout.