Greetings - I have decided to offer the best way of farming Sap, Bark and Lustrous wood by using a horizontal style of farm - so the experience will be similar to mining. The farm is totally safe!
If you wish to connect, there are 3 available portals on each farm!
Three are 2 floors.
Farm 1 - Portal: From TNT Alcyon go to "Stardrop Valley Sap Farm"
Planet: Stardrop Valley, color: Silk Mustard
Farm 2 - Portal: From TNT Alcyon go to "Hyrule Sap Farm"
Planet: Hyrule, color: Oxide Grey
Farm 3 - Portal: From TNT Shedu Tier go to "Farresa Sap Farm"
Planet: Farresa, color: Black
Farm 4 - do you have a planet with Island Trees?
How to use: go three blocks deep into any wall and then harvest by following the perimeter. Think of it as an inverted regen farm. Usually you would harvest the inner part while here you need to harvest the outer one.
Please kindly regenerate!
All three farms look the same - samples below: