Magnesium Deficiency
Problem: A light green or yellow coloring will begin to show on the veins and edges of the lower & older leaves – this is one of the classic signs of cannabis magnesium deficiency. You may also see red stems.
Magnesium is a mobile nutrient, which means that the plant can move it from old leaves to new leaves.
If you don’t react to it promptly, a cannabis magnesium deficiency can spiral out of control and cause your plant to lose a lot of lower leaves quickly. The plant will pull magnesium out of older leaves and bring them to the newer leaves. That’s why a magnesium deficiency usually appears towards the bottom of the plant and on older, less important leaves.
The edges of the leaves may become yellow or bright green and may start feeling crispy to the touch. This crispiness around the edges is different from nutrient burn, which does not lighten the margins inside the leaves.
How to Identify & Fix Cannabis Root Problems with Pics!
Root Problems
Cannabis Plants With Root Problems Show Many Symptoms
- Cannabis may appear over watered or droopy
- Curling or cupping of leaves
- Wilting – either individual stems wilt or the whole plant may wilt
- Slow growth, or staying very small for weeks
- Leaf yellowing, or sometimes even other colors like purple or red
- Brown spots / Burnt spots
- Other strange nutrient problems
- Brown or slimy roots – this is often a sign of root rot
- Smelly runoff water (smells rotting or musty)
- Leaves may start dying and falling off rapidly
- Plants drink much less water than usual
And here is ZINC deficiency
Zinc Deficiency
Problem: With a cannabis zinc deficiency, younger leaves start yellowing in between the veins. Leaf tips get discolored and start dying. the leaves may take on a unique banded appearance and the plant may stop growing vertically. There may be much less space between new nodes, which can cause new leaves to start bunching together. If the plant is budding, its flowers may stop growing or even start dying if the problem isn’t corrected.