If you dont have a ph problem. There are a few organic ways to add micronutrients to your cannabis plants. One way is to use compost teas. Compost teas are made by steeping compost in water for a period of time. This creates a nutrient-rich solution that can be applied to your plants. Another way to add micronutrients is to use seaweed meal. Seaweed meal is a dried and ground form of seaweed that is high in micronutrients. It can be applied to your plants as a foliar spray or mixed into the soil. Finally, you can also use rock dust. Rock dust is a finely ground form of rock that is high in minerals and micronutrients. It can be mixed into the soil or applied as a foliar spray. When choosing a rock dust product, be sure to choose one that is specifically designed for plants.
Root death is also a very common reason for lighter new growth
It's tough to get rid of completely, but we can try to slow it down. First, you'll want to repot your plant with fresh soil. Make sure the new pot has good drainage. Then, you can add some hydrogen peroxide to the water when you do water your plant – just a capful per gallon should do the trick.
Also remember to let that soil dry out a bit between waterings. To figure out how long to wait, check the top inch or two of soil – it should be dry to the touch before you water again.