Red lungwort is native to southeastern Europe. A popular garden plant for many centuries, it can now be found as an introduced exotic in places such as Finland and Poland. Unlike the other dozen or so species of Pulmonaria, red lungwort does not have blue flowers (hence the Latin and common name).
‘Redstart’ red lungwort was evaluated by the Chicago Botanic Garden in its Appraisal of Pulmonaria for the Garden (PDF) and ranked as “fair” or three stars out of four. If you’re considering this early bloomer (or any other Pulmonaria) for your garden, it would be worthwhile to read the evaluation – it grades over fifty species and cultivars. The BBC Gardening site also has a small amount of information specific to ‘Redstart’.