What are these?

[Frustratedbyweeds]

Tried to identify these 2 plants, which are abundant and persistent on my plot. Any ideas welcome!

First one has a black woody underground horizontal root/rhizome from which multiple shoots spring along length, and second has a single long white-ish tap root from which the leaves all emerge directly at top.
Thanks

[veggiechicken]

Hi & welcome!
You'll have some better guesses tomorrow when more of us are awake, but my best guesses are horseradish and comfrey.
Does the root of the first one smell much?

[Mr Bones]

Hello and welcome to the Vine. Agree with you VC, horseradish and comfrey. Two useful plants but rather invasive.