How do you cross a blackberry with a raspberry?

To cross a blackberry with a raspberry, you typically need to perform a process called hybridization, which involves transferring pollen from the flower of one species to the stigma of the other. This can be done by hand using a small brush or by allowing natural pollinators to assist. The resulting seeds from the hybridized flowers can then be collected and planted to grow new plants that exhibit traits from both parent species. Keep in mind that successful hybridization may require specific conditions and patience, as not all crosses will produce viable offspring.