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Orchid bark from 2024 should be fine to use in 2026. Bark doesn't really spoil the way food does - it's just wood pieces, so it stays stable for years as long as it's been stored dry and hasn't developed mold. The main thing to check is whether it's still loose and airy rather than compacted or clumpy, which would mean it's broken down over time and won't drain as well for your orchids. If it looks and feels normal, go ahead and use it.
As long as your 2024 bark stayed dry and wasn't exposed to moisture or pests during storage, it'll work fine - wood doesn't degrade like organic matter. The real trap is checking for mold or mildew before you use it, especially if it's been in a humid garage or shed, since that can sneak up on you and cause root rot faster than old bark ever would.
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