I hope you're not taking foxgloves from the wild to plant in your garden. It's illegal. Very easy to find seeds for all colours and sizes of foxglove from main seed company or maybe just collect seed from friends' gardens? Sow them fresh and they will produce the base rosette fairly quickly. The flowering stems are produced in the 2nd year and then it all starts again and you end up with a succession of plants from one year to the next.