Hydrangeas are attractive flowering shrubs that are easy to grow from seed in home landscapes. Several species of hydrangea seeds are readily available from home and garden stores as well as seed catalogs. Hydrangeas are commonly planted as specimen plants or used to create colorful shrub borders. The shrubs develop numerous long-lasting flowers that bloom from summer through fall. Hydrangeas are hardy plants that are easy to grow and care for indoors before you transplant them in your landscape.