An evergreen library stops the daily scramble only if it is big enough to cover your calendar and small enough to build in two weeks. The size comes from one formula, not from a feeling that you should have "a lot" of evergreen content. Work out the number, then fill it from the archive you already have.
TLDR: Library size = posts per week x evergreen share x weeks between repeats. At 5 posts a week, 40% evergreen and a 12-week cycle, you need 24 posts, and most of them already exist in your archive.
Mydrop data, September 2026: on accounts connected to Mydrop with at least 8 posts, accounts posting under once a week had a median engagement rate of 7.0%, 1 to 3 posts a week 3.1%, 3 to 7 a week 1.5%, and 7 or more 0.7%. That is a correlation, not a cause: smaller accounts post less and carry higher rates. Method in the Mydrop social media benchmarks.
The formula, with three worked sizes
Pick three numbers. Posts per week per profile. Evergreen share, the part of your calendar you want covered by posts that never expire. Repeat gap, the number of weeks before the same post can return, with a new opening line.
| Posts per week | Evergreen share | Repeat gap | Library size |
|---|---|---|---|
| 3 | 33% (1 a week) | 12 weeks | 12 posts |
| 5 | 40% (2 a week) | 12 weeks | 24 posts |
| 10 | 50% (5 a week) | 12 weeks | 60 posts |
The 12-week gap is a starting point from our experience, not a rule. Lengthen it if your audience is small and sees every post, shorten it if reach is low and most followers miss most posts.
For context, in Mydrop's data on accounts with at least 8 posts in the last 180 days, 135 publish between one and seven times a week. That puts most teams in the 12 to 24 post range, which is a two-week project, not a quarter-long one.
Pull the first draft of the library from your own archive
Do not write 24 new posts. Go back through the last 12 months and keep a post only if it passes all four of these:
- It performed at or above that account's own median.
- It has no date, price, event, promotion or news hook.
- It would still be correct and useful in six months.
- It does not rely on a trend, a meme or a version of a tool.
Mydrop's performance view lets you sort posts against each account's median, so the shortlist takes minutes instead of an afternoon. Aim for about 1.5 times your target, then cut the weakest. In our experience a good share of candidates fail the "still true" check.
Tag every post so it cannot go stale unnoticed
A library that is not maintained turns into a liability. Give each entry three tags: a topic (for example "onboarding tips"), a format (carousel, short video, text), and a last-used date. Add a fourth, review by, three months out.
The topic tag stops you from scheduling five posts about the same thing in a row. The format tag keeps the mix balanced, because in our September 2026 data carousels ran 10% above an account's typical post while photos and videos sat at the median.
Schedule the floor first, then write around it
Fill the calendar in this order: evergreen slots first, campaigns second, reactive posts last. Because the floor is already there, a missed week means a slightly less fresh week, not an empty one.
In the social media calendar you can place the evergreen posts into recurring slots across several profiles and view the whole month at once. For each repeat, rewrite the first line and the image crop. The evergreen scheduling guide covers the mechanics.
One caution: pause the library around launches, incidents and holidays. The evergreen-to-event pause matrix shows when.
Review it once a quarter: keep, refresh or retire
Every three months, take each post through one decision:
- Keep: it still beats the median when repeated.
- Refresh: the idea holds, but the facts, image or hook need updating.
- Retire: repeats fall below the median twice in a row, or it no longer matches the brand.
Replace retired posts with the best-performing new content from the last quarter that passes the four-point test. The library then improves each cycle instead of just aging.
Fill your first ten slots this week
Start small. Find ten posts from your archive that pass the four-point test and drop them into the next four weeks of your calendar as the evergreen floor. If you manage multiple brands, start free with Mydrop and use one calendar for all of them, with each brand's own evergreen slots.
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