Take the possibility of rainfall and flash flooding seriously when hiking the canyons of Northern Arizona. It is a good idea before you hike to study maps to identify possible escape routes. Be especially careful hiking the Grand Canyon, Marble Canyon, and Glen Canyon regions.
Own-root roses are propagated by rooting stem cuttings of one variety of rose. From the band size pots tyically sold, the plants will put out a few new full-sized canes each year and then reach mature height and width in 2-5 years, depending on the variety.
You may ask why bare root budded roses out number roses with own roots. I can make one intelligent guess: making bare root budded roses is cost effective. From a single cultivar, you can get hundreds of buds for budding onto the rootstocks. Nurseries do not have to maintain a large number of cultivars.