Forgot to mention:

Norfolk Pines require similar care to Orchids and Gardenias (believe it or not). Based on that knowledge, years ago, I started using a potting mix of 50% Orchid Mix and 50% Sand. The trees LOVE this mix. Thoroughly blend the orchid mix with the sand, so the sand completely coats the orchid mix.

I use Black Gold: https://www.amazon.com/Black-Gold-1411402-8-00QTP-Orchid/dp/B06XC72H2Y (Will be much cheaper from a local garden center).

And Carib Sea Sand: https://www.amazon.com/Carib-Sea-ACS05820-Moonlight-Aquarium/dp/B00DDYZQ8Q/ (Cheaper from a local pet store.)