- Name: Japanese Hydrangea - Other Common Names: Hydrangea Vine - Scientific Name: Schizophragma Hydrangeoides - Color: White - Plant Seeds: Outdoors After Frost / Indoors Weeks Before Last Frost - Bloom Time: Summer - Hardiness Zone: 4 - 8 - Plant Height: 20 - 30' - Plant Spacing: 10 - 20' - Light Requirements: Part Shade - Soil & Water Preferences: Average - Moist - Quantity: 50 Seeds - Other: The Japanese Hydrangea Is A Vining Perennial Native To Asia. In Summer, The Vines Are Covered With Huge Showy 8 - 10" Clusters Of Flowers. They Have A Long Bloom Time Of 2 Months. The Heart-Shaped Leaves Are A Bluish Green That Turn Yellow In Fall. The Hydrangea Vine Can Grow In Full Sun Or Shade, But Will Flower The Most In Part Shade. Feel Free To Train Them To Grow Up A Trellis, But These Vines Are Able To Climb Walls. They Also Look Lovely Cascading Down Over Walls Or Out Of Containers.