An avocado plant can be nurtured and cared for - sometimes it still gets brown leaves. This can have several causes.

Causes & Treatment Tips
» waterlogging/lack of water:
Brown leaves can appear on an avocado due to over-wetting. The plant only tolerates moderate moisture. So water relatively little. However, brown leaf tips can also be a sign of a lack of water.
» Fertilizer:
If young avocado plants have been fertilized too much, the leaves can also turn brown. Accordingly, only supply the plant moderately with nutrients. Two fertilizer sticks, for example, are often too much.
» Location:
Brown leaves are also caused by a wrong location. For example, if the avocado is on a south-facing window, it could be sunburned. It is therefore best not to place the avocado plant too dark, but in a light location (but not in direct sunlight).