Even if you aspires to write Evergreen notes, most notes begin as transient notes. You should be able to capture thoughts without friction (Close open loops), then reliably develop them into evergreen notes over time (Knowledge work should accrete). This implies two important mechanisms:
I use a “writing inbox” for this purpose. Undeveloped ideas, excerpts from my Daily working log, notes from reading, one-line prompts, etc all begin in that queue. During My morning writing practice, I’ll look through notes in this inbox and spend time developing any that strike me. On most days, I spend the majority of my writing time in this way.
Many notes in my writing inbox end up as evergreen notes, but that’s not appropriate (or possible) for all of them. If a note doesn’t seem sufficiently interesting after a few looks, it’s best to archive or delete it. (A challenge here: Triage strategies for maintaining inboxes (e.g. Inbox Zero) are often too brittle)
While I’m at my computer, I capture notes directly into my writing inbox. I also feed it with: Pocket memo pad to capture into writing inbox while out.
My practice of writing Evergreen notes is heavily inspired by Niklas Luhmann’s Zettelkasten practice and its contemporary advocates. I use a different term both because there are some distinctions and because I want to give myself space to explore ideas in this space apart from the culture surrounding Zettelkasten, which has its own prior values and proclivities.
One final difference, this one a touch pointy: the primary purpose of my system is to develop ideas in my core creative projects. Most people in the contemporary Zettelkasten culture seem to use their systems primarily to write notes about others’ ideas. If they’re developing their own ideas with them, those ideas are an interesting hobby, not their core creative work. All this falls afoul of the issues around People who write extensively about note-writing rarely have a serious context of use. I don’t know how, exactly, but my context of use substantially shapes the note-writing practice.