I have been growing an avocado tree from the pit indoors for roughly 6 months. It seems to be growing strong as it has beautiful large leaves and many new sprouts (after I pruned it). I also have a 6000K grow light which I am using since the window isn't getting a ton of light (Canadian Winters are dark).
I transplanted it into a large felt-like grow bag similar to this one.
I am noticing some browning on some of the lower leaves. Here is an example of what I am referring to:
Some of the bigger leaves also have a small amount of brown right at the tip of the leaf.
I don't think I have been over watering the plant as I usually stick my finger down into the soil and make sure it is pretty dry before I water it again (as I have read to do - maybe I am wrong here).
Any thoughts on what this could be and how to fix it?