Below you can find the In the names of weeds this old word for a plant follows soap- & st. john's Jeopardy Words Answer. The answer to In the names of weeds this old word for a plant follows soap- & st. john's has 4 letters. This clue belongs to the Weeds category and is part of Jeopardy Word Level 302. If you scroll near the bottom you will find other clues and answers part of level 302