the amateur division of the show known as the competitive classes often have an assigned theme, related to the overall show theme. the 2007 show, legends of ireland, featured pressed plant material (i.e. dried flower pictures) that "incorporated a celtic knot." the first weekend's medium niche theme was "wish you were here" "exhibitors will be sent irish postcards for inspiration. a copy of the postcard will be mounted next to the exhibit." entrants for that class typically have a mockup of the niche at home, where they practice assembling and lighting their entry in the months preceding the show. in a "challenge" class, entrants bring only pruning shears, and must use show-provided materials to interpret a theme within a limited amount of time. three typical "horticulture" classes are 142: "clivia, flowering. pot 8" or under", 143: "clivia, flowering. pot 8"-10"", and 144: "clivia, foliage". (there was also a clivia entered in 2007 under "exceptional plants 10–20 years old, to be judged against “perfection” for their species/cultivar.")