Elaboratus, mean "made by art, and properly, with care, elaborated."
This is possibly a reference to the "ora et labora".
The Concipio on the tree, mean "to take several things in the same time".
Vulcan pour the saturnian waters upon the roots of the tree in order to nurture it, see the dew also, coming from above.
In the philosophy of alchemy, all metals are made of the same substance, à different degres of maturity. When you cut the root of a plant, or you put the whole plant out of earth, then, it cannot grow anymore, this is the same thing with metals. If you put in the fire a plant, it is destructed, again this is the same thing with metals.
It is not because metals can melt, that they have to be melted !