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.
Before the 17th century, Ms. was the abbreviated form of Mistress, which indicated that the lady was married, or in charge of a household. Miss and Mrs. began to be used in the 17th century to show the difference between a married woman under her husband's headship, and an unmarried woman under her father's headship. Mrs. was used with a lady's husband's first and last name (eg. Mrs. John Smith) and never with her own first name (eg., never Mrs. Julie Smith). Miss was used for any woman who was not married, with Miss and the last name alone used for the eldest daughter in the household, and Miss with both the first and last name used for all other daughters in the household.