I have an ~8 month avocado plant that was growing really well until about two months ago, when it started developing large dark brown spots on the leafs. The spots continued to spread to the neighboring leafs (started at the bottom leafs and have moved up), until the entire leaf browns and dries up, at which time I remove. At one point the plant was also drooping, but water seemed to help that. I also moved the plant into a larger pot, and have been spraying some fertilizer on it but it seems to be progressing, with the leaves turning brown and curling on the ends. I moved the plant to a sunnier spot a couple of days ago, but it does still get cold in the house. Any suggestions on how to proceed to prevent my plant from dying? :( Thank you in advance!!
Avocado plants tend to get brown leaves for lots of different reasons
Normally when flowering it would use the mobile nutrients that it requires from the leaves. Leading to dead leaves that are brown and dry as you describe. https://m.youtube.com/watch?v=R33ifj7JqgI
but judging from your post it may be due to cold weather or chlorine in the water.
Update: may be chloramin buildup in the potting medium.
I doubt it's too much ultraviolet light as it is indoors
3 reasons why leaves turn brown (Avocado style) https://m.youtube.com/watch?v=eM7xOUcL_F0