The seeds for this species can purchased online through a multitude of vendors online, and are commonly found in Europe include the United Kingdom, and parts of the United States. In the European countries that this species can be found in it is notably susceptible to honey fungus.The leaves of this species can be eaten once they have been cooked, and is usually served with rice. This species has also been used in a wide variety of studies and research projects. A recent project that was conducted by the Department of Forestry at Kyoto University in Kyoto Japan conducted its research on spatial arrangement of the floral buds of plants which perform functions such as climbing and protection of the terminal parts showing their stems nature with emphasis on herbivory on the shoots that have grown in the new growing season. Another portion of this study was done on the competition from surrounding species and compare the requirements that is needed for the support of the species to grow. A recent article that was published by the University of Chicago Press was on an already conducted research project that included a variety of Hydrangea species, including the Hydrangea hirta that was on the phylogenetic implications of seed morphology the species. This study was conducted on eleven seed characteristics including shape, primary sculpture, secondary sculpture, and appendages. The last example of a research study was done on the genome size and base composition on a variety 16 species and subspecies of hydrangea, including hydrangea hirta. The study showed that natural hybrids between thy hydrangea species are rare. However, this study stated that  there have been natural hybrids found in the Izu Peninsula of Japan between Hydrangea hirta and Hydrangea scadens. However, for breeding programs and or potentially enlarging the genetic diversity in cultivated species this study looked at the natural hybrids evolutionary development and diversification. The charity Plants For a Future: earth, plants, people provide a list of closely related species. The species that are closely related to Hydrangea hirta include: Deinanthe bifida (False Hydrangea), Deutzia scabra (Fuzzy Deutzia), Dichroa febrifuga, Hydrangea anomala (Climbing Hydrangea), Hydrangea arborescens (Wild Hydrangea), Hydrangea aspera (Rough-leaved Hydrangea), Hydrangea macrophylla (Bigleaf Hydrangea), Hydrangea paniculata (Panicled Hydrangea), Hydrangea serrata (Mountain Hydrangea), Hydrangea serrata amagiana (Tea of Heaven), Hydrangea serrata thunbergii (Sawtooth Hydrangea), Philadelphus coronarius (Sweet Mock Orange), Philadelphus delavayi (Chinese Mock Orange), Philadelphus lewisii (Indian Arrowwood), Philadelphus pubescens (Hoary Mock Orange), Philadelphus x virginalis (Virginal Mock Orange), Platycrater arguta (Cobweb flower), Schizophragma hydrangeoides (Moonlight Chinese Hydrangea Vine), and Schizophragma integrifolium (Chinese Hydrangea Vine).