Add the line you want in desired biome ".veg" file

Beech1
Beech_small1
Beech_small2
Birch1
Birch1_aut
Birch2
Birch2_aut
BlueberryBush
Bush01
Bush01_heath
Bush02_en
CloudberryBush
Crow
FirTree
FirTree_oldLog
FirTree_small
FirTree_small_dead
Flies
GlowingMushroom
HeathRockPillar
HugeRoot1
HugeStone1
Leviathan
MineRock_Obsidian
MineRock_Tin
Oak1
Pickable_Barley
Pickable_BogIronOre
Pickable_Branch
Pickable_Dandelion
Pickable_Flint
Pickable_Mushroom
Pickable_SeedCarrot
Pickable_SeedTurnip
Pickable_Stone
Pickable_Thistle
Pickable_Tin
Pinetree_01
RaspberryBush
Rock_3
Rock_4
Rock_4_plains
Skull1
Skull2
StatueEvil
SwampTree1
SwampTree2
SwampTree2_darkland
SwampTree2_log
Waystone
acacitree
horizontal_web
ice1
ice_rock1
mudpile_beacon
ormbunke_green_medium
rock1_mountain
rock2_heath
rock2_mountain
rock3_mountain
rock3_silver
rock4_coast
rock4_copper
rock4_forest
rock4_heath
rock_a
rockformation1
shrub_2
shrub_2_heath
silvervein
stubbe
tunnel_web
vertical_web
vfx_edge_clouds
vfx_ocean_clouds
vfx_swamp_mist