Seedling Haven is where most Seedlings grow, it's the best location to find Golden Seedlings (after you've beaten the Seedling King) due to the spawn ratings being higher. It is also home to the Bounty Seedling King. Seedlings bloom absurdly fast in this soil, and leave to explore the Bugarian Outskirts. The Seedling King's footsteps enrich the soil, allowing this process.
The seedlings in this location have a 7.5% chance (18.75% with Seedling Affinity) to be a Golden Seedling.