Horseradish is at its best in fall and winter. Like so many other root vegetables, however, it stores well and is often available in decent shape well into spring. Jerusalem artichokes/sunchokes are brown nubs, that look a bit like small pieces of fresh ginger.
Using Ms. or Mrs. in a cover letter depends on whether or not you know the marital status of the woman. If you are ever uncertain, it is always safe to use Ms. because it does not make an assumption about her marital status.
Mrs (pronounced like the word misses) is for married women, Ms (pronounced mizz) is for single women, and Miss is for children. However, Ms is also increasingly used as a whether or not you are married title. In a formal context, if a woman is married but uses her maiden last name, you must use Ms..