Biennials are started from seed the first year then they flower and die the second year. There are many exceptions to this description. Some biennials self seed so appear to be perennial. Others, such as pansy, are grown as annuals. The seed is usually started during the summer of the first year.
Controlling dust is very important for people who are allergic to animal dander and mites. You cannot see mites, but you can either remove their favorite breeding grounds or keep these areas dry and clean. Dust mites can thrive in sofas, stuffed chairs, carpets, and bedding. Open shelves, fabric wallpaper, knickknacks, and venetian blinds are also sources of dust mites. Dust mites live deep in the carpet and are not removed by vacuuming. Many doctors suggest that their mite-allergic patients use washable area rugs rather than wall-to-wall carpet.