Ferroustry will add fourteen species of trees that will provide you with not only new decorative blocks, but also vanilla ores when processed in a smelter.
Ferroustry Mod for Minecraft 1.15.1/1.15/1.14.4
It is worth noting that the trees will not spawn on their own – to create a new seedling, you will need to place an ordinary seedling in the crafting grid and surround it with eight units of the desired element (iron, diamonds, redstone).
1.15.1/1.15 – ferroustry_1.15.1_2.0
1.14.4 – ferroustry_1.3b