Mycorrhizae, Humic Acid & Seaweed: The Biological Trinity
April 28, 2026 The UNDER SOD™ Team 5 min read
The whole is greater than the sum of its parts.
Each of these three inputs is valuable on its own. The reason UNDER SOD™ combines all three is that they reinforce one another — a synergy conventional starters never attempt.
The Three Players
- Mycorrhizal fungi extend the root system and deliver water and phosphorus from beyond the root zone.
- Humic acid builds the soil chemistry and habitat the fungi need to colonize and thrive.
- Seaweed extract supplies natural cytokinins and auxins that reduce transplant shock and trigger new root growth.
Why They Work Better Together
Seaweed kick-starts root initiation in the first days. Humic acid prepares the soil so the fungi can establish. The fungi then extend that new root system far and wide. Each input sets the stage for the next — which is why the combination outperforms any single amendment.
The biological trinity
Initiate roots, build the soil, extend the network — in that order, working as one.
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