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Knowledge Base
KNOWLEDGE BASE
How mangrove restoration works (and fails)
Fix the water flow first, let the forest regrow naturally where it can, and plant only when needed.
Restoration has a poor reputation because many planting campaigns have failed. The lessons are now clear.
Principles that work
- Why did the mangrove die? If the cause (cutting, blocked tides, grazing) remains, replanting will fail.
- Hydrology first. Mangroves need regular tidal flooding. Reopening a blocked channel often restores the forest with no planting at all.
- Natural regeneration where possible. If seed sources are nearby and conditions are right, protect the site and let trees return.
- Right species, right place. Plant the species that grows in that zone, at the correct tidal height. Planting Rhizophora on a high flat is a classic mistake.
- Involve and reward the community, then monitor for years.
Atlas data for this. The Kenya restoration module has 12 assessed sites (about 46 ha), natural-regeneration plots and protection zones with NDVI (a greenness index) for fiscal years 2023–25. Four sites are rated highly degraded.
Measure success by survival and canopy cover after 3–5 years, not by seedlings planted.
Limits. Atlas records assessments and indices; it does not have survival counts for every site.
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