Back. 1  Vitacost Chromium Picolinate -- 500 mcg - 300 Capsules. 4.5 out of 5 stars 11. 2  Vitacost Strontium -- 680 mg per serving - 240 Vegetarian Capsules. 4.6 out of 5 stars 19. 3  Vitacost Glucomannan -- 2000 mg per serving - 180 Capsules. 3.7 out of 5 stars 51.
The most common cause of marijuana leaf cupping aka leaf margin rolling, leaf margin burn, and leaf tip curl/burn is overzealous use of marijuana plant food. In relationship to factors such as marijuana plant vigour and rate of growth. Leaf burn is often the very first sign of too much marijuana fertilizer.
Environmental stress from bouts of cool rainy weather, herbicide damage, severe pruning, sucking insects and viruses tend to cause tomato leaves to curl. Yo-yo watering and severe pruning may cause a tomato plant temporarily to develop thick, leathery leaves that curl upwards. In this case, the plant shows no effects on flowering, fruiting or growth. The plant should re-adjust within the week. <br /><br /><b>Herbicide damage</b>, particularly from <b>2,4-D</b>, may cause tomato leaves to curl first downwards and then upwards. In this case, the plant may show such effects as cat-faced fruit, stunted growth and twisted leaves.