Can Li Shanhong graft Hundred Days Red?

I can't. They are not plants of the same family, so they cannot be grafted. Rhododendron, also known as Rhododendron, is a shrub plant of Rhododendron in Ericaceae. Rhododendron is a woody flower, which blooms in spring, while zinnia is a deciduous shrub or small arbor plant in Wei Zi, belonging to woody flowers. Rhododendron and zinnia are not plants of the same family, so they can't be grafted. Yingshanhong and Hundred Days Red have a very long history in China, and they have gone international with their beautiful flower postures.