.. Frozen Mixture

Okay, mix them and freeze them. You can easily do the mixing in the inventory. ( First, name tag and soil. Next add the baked seeds. )

You would need to find a really cold place to dip the mix into.

I think ice, or the water beneath it, is quite cold. ( There are skating floors in the villages. )

You should use the Krampus' village skating floor. Just cut a a hole into it. ( Use the ice skates on the skating floor to cut the hole. )

Now dip the mixture into the hole.

Yeah. Do you have an item you could use to lower the mix into the ice hole. Lke fishers do. ( Use the fishing rod. )

Well, the mix is just utter mess. Maybe you should put it into some kind of easily freezable container so it is easier to attach into the fishing rod.

Combine the mixed soil, name tag and seeds with stockings. ( You will find stockings from the tailor at Krampus' village. )

Then attach the full stockings into the fishing rod. Now you can freeze the mixture in the ice hole.

Now you need to plant the froze mixture adjacent to the northern wall of a human house.