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.
Single-space the paragraphs in your cover letter or email message. Leave a space between the final paragraph and your closing. Leave a space between the closing and your signature. When you're sending a typed letter, include a handwritten signature, and a typed signature underneath it.