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Blue sky vine is a large, twining vine that boasts beautiful pale blue flowers. It is a rapid grower and becomes quite large over the course of a season.

Latin Name

Thunbergia grandiflora



Also Known As

Bengal Clockvine

Type of Plant

Tropical Tropical
Vines Vines


Summer Summer


Max height Max Height: 30'
Max spread Max Spread: 6'


  • Ornamental

  • Sunlight Exposure

    Full Sun Full Sun
    Part Shade Part Shade


    Native Range

    Northern India


    George Washington received blue sky vine plants from Thomas Law, who was his grandson-in-law, in 1799.

    Other Details

    Pollinator Pollinator
    Grown by Washington Grown by Washington

    Planted at Mount Vernon

    Planted at Mount Vernon Upper Garden

  • Upper Garden

  • Hardiness Zones

    10a 10b USDA basemap

    Average annual extreme minimum temperature 1976-2005

    map legend 10a 10b

    Bartlett Tree Expert Company has been working with Mount Vernon Estate since 2011 providing expert arboricultural care and GPS mapping for the estate’s historic trees, as well as support from their research facility.   Mount Vernon is proud to partner with Bartlett Tree Experts and appreciates their sponsorship of George Washington’s Mount Vernon Plant Finder App.

    Bring Washington's Garden Home

    Purchase our historic seeds, collected from plants grown at Mount Vernon and plant them in your own garden.

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