Coco chips would be a good substitute if you're looking for a larger particle to incorporate for drainage and can't find the bark.
21+ Orchid Bark Chips. Wooden bark and chips are biodegradable, which is a big plus for some gardens. Young orchids with smaller roots need bark that's been ground into a finer material.
Orchid Media What Should I Use To Plant My Orchid Akatsuka Orchid Gardens from akatsukaorchid.com
Coconut husk chips are a common substitute for fine or medium fir bark. Amphibians, forest or jungle living reptiles and invertebrates all thrive on this safe 100% natural poduct. Orchid bark by orchiata is a standalone orchid growing substrate that can be used directly from orchiata holds water and nutrients on the outside layer of each chip, as well as creating a slightly.
Sometimes bark chips are also a component in soil mixes for other plants.
It also helps keep the humidity up. Ideally, the bark chips should be hard, fairly thick, and of reasonably uniform grade. I've bought it by the bag and in a block form. Sometimes bark chips are also a component in soil mixes for other plants.
