No rose is completely immune to disease or infection—this is simply part of gardening. While own-root roses tend to be healthier and more resilient than grafted roses, they are not entirely disease-proof.
At our nursery, we carefully test and select high-quality, disease-resistant roses. Many roses can thrive without spraying, especially in drier climates, though you may notice some blemishes on the foliage. However, in humid regions, particularly the Southern U.S., diseases like Blackspot are more common and may require preventative care.
Good air circulation, proper watering, and organic treatments can help keep your roses healthy with minimal intervention.