Nick Kitchener wrote:Three "do nots" I am aware of are:
1. Do not grow trees on the hugelbed because the bed settles a lot over time and just isn't suitable for a tree growing system.
2. Do not construct a hugelbed with wood chips as it alters the decomposition and provides a mega hotel for pillbugs.
3. Do not leave any branches or wood sticking out of the pile as it will wick the bed dry.
I've done 2 and 3 with no problems.
16 years ago, I made a garden from 2 dump truck loads of wood chips, half as much dirt and lots of chicken manure. None of the dire predictions came true. Three years later the whole mess was full of earthworms.
I currently have piles with many chunks sticking out. They provide shade for the dirt and they capture blowing leaves. They rot off eventually and I stack them at the base of the piles. These are slash piles that were made with an excavator and topped with soil and 1000 lb of coffee waste. Photos to follow.
This thread examines various good and bad woods for different situations.
https://permies.com/t/12206/hugelkultur/Hugelkultur-Good-wood-Bad-wood