Spring's Eco Mod aims to add more vanilla feeling biomes, geodes, dungeons, and progression changes(however it does break free from the vanilla+ ties the deeper you dive). With 9+* Brand new biomes most of which having unique trees with new wood sets your plate should hopefully be filled.
The Temperate Forest
The temperate forest is a calm biome with not much going on, the biome is loosely based on parts of europe. In this biome you will find the new Tilia trees, if you wait around long enough limes might even grow on the leaves for you to shear off.
The Rainforest
The rainforest is a very messy biome filled with untamed foliage and aggressive wildlife. In this biome you will find 2 new trees, the Eucalyptus Tree and Tangarana Tree. The Tangarana tree houses very aggressive fire ants that will go after other plants to improve the survivability of their Tangarana Tree nest.
The Grotto Grove
The Grotto Grove is one of my personal favorites, its a very dense and calm forest with lots of foliage.
The Dense Birch Forest
The Dense Birch Forest is a simple biome, it takes the idea of the old growth birch forest and packs in a little more birch.
The Redwood Forest
The Redwood Forest is a forest made up of a towering new tree, The Redwood Tree. You may find some abandoned huts carved out of them.
The Fungal Fields
The Fungal Fields is a swamp like biome filled with colorful glowing mushrooms with unique abilities. This biome brings two new trees, The Cotton Tree and the Ancient Shrooms.
The Fungal Caverns
The Fungal Caverns are very lifeless fungus dominated caves. The walls are made of shroomstone and the floor is covered in minecelium. The vines can be grown and smelted into a very powerful food source.
The Mahogany Rainforest
The Mahogany Rainforest is a much calmer rainforest with more sparse trees. This biome brings one new tree, the Mahogany Tree.