Brown Rusty Dots

Bear in mind once the spots are there—- they don’t go away. And any deficiency you see is at least 2 weeks old before it becomes noticeable— only new growth will look good after the PH and calcium is fixed! Calcium is an important nutrient that helps provide structure to the cannabis plant and helps it withstand stress like heat. When your cannabis plant has a calcium deficiency, the main symptom that you’ll be able to notice is brown or bronze splotches or spots on your leaves. It is also often associated with yellowing (though leaves don’t always turn yellow). Occasionally the splotches may appear purple especially under LEDs. Calcium deficiencies are often caused from low pH at the roots, but also occasionally from growing in soft/filtered water.