Q.My Norfolk Pine’s main branch is turning brown from the bottom of the trunk up. Some needle branches have turned brown and fallen
off. The browning of the trunk is almost 3/4’s up the 5 foot Pine. I have had this plant for at least 6 years and has always been healthy looking except for a few branches dying and dropping from time to time. If the main branch is brown from bottom, up, is this a sure sign it is dying? It still has lots of new needle shoots at the top of it. It has always been indoors.

Certified GKH Gardening Expert
Our experts say that this older plant needs more frequent fertilization, like every 3-4 months.
Here are two helpful articles: https://www.gardeningknowhow.com/houseplants/norfolk-pine/norfolk-dropping-branches.htm
https://www.gardeningknowhow.com/ornamental/trees/pine/pine-tree-browning.htm