Bulbs, Corms and Rhizomes are herbaceous plants, when they die back at the end of each season all the goodness from the plant matter is stored in the bulb, corm or rhizome.
Biennials are herbaceous plants that complete their life-cycle in two years. Growing in the first year and flowering in the next. Some plants grown as biennials are actually short-lived perennials, they tend to be dug up after flowering because they do not perform well in their second year.
Bedding Plants are usually used to fill gaps in the borders for a temporary affect. Once flowering is complete they can be disposed of on the compost heap. They mainly consist of Half Hardy Annuals.
Alpines are small shrubs or perennials that grow naturally in mountainous areas and are often used in rockeries.
Half Hardy Perennials are similar to hardy perennials in that they will also die down in autumn and grow again the following spring, however, they cannot withstand frost so they require to be protected over the winter or taken into a greenhouse.