They all support fertility, but they do different jobs.
**Compost** is the broad all-rounder. It adds stable organic matter, biology, and a balanced fertility lift. Good for beds, topdressing, and general soil improvement.
**Worm castings** are more concentrated and biologically active. They are great for seedlings, transplant shock, potting mixes, and giving plants a gentle boost without overdoing it.
**Manure** can be very useful, but it depends on the source, age, and how well it has been composted. Aged manure can help build fertility and organic matter. Fresh manure is often too strong for direct use and may carry weed seeds or pathogens.
A simple way to think about it:
- compost = foundation
- worm castings = booster
- manure = strong input that needs judgment
If in doubt, use modest amounts and observe how the soil and plants respond.
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