- Thunbergia , also known as black - eyed Susan vine or clock vine , is a quick - growing vine vaunt many open - faced flowers , usually with dark nitty-gritty ( hence the name " dim - eyed Susan " ) . Where not affect down by frost it is a perennial , but most clime of the United States grow it as a beautiful annual . The name Thunbergia honors a Swedish botanist named Karl Pehr Thunberg .
grim - eyed Susan vine can grow 6 to 8 feet grandiloquent in a season and has bumpy , hirsute leaves . The efflorescence have 5 trenchant petals and are proportionate . Flower color can be white , yellow , orange , or emollient . Most of them have dark kernel .
loosely , it grows best in full sun . It want fair , well - enfeeble soil . Plant seedlings 3 column inch away from supports . distance plants 5 to 8 in apart . Pinch the tips to encourage branching . Since genus Thunbergia climb by twining , netting or strand make good trellising materials . They will need a treillage to climb large posts or solid fencing .
By semen or by cuttings . Sow seeds outdoors after the last freeze or get down seedlings indoors 6 to 8 calendar week before outdoor planting . Seeds burgeon forth in 10 to 15 days at 70 to 75 degrees Fahrenheit . Cuttings rootle easy in a commercial soil mix .
Thunbergias can be used to cover posts , porch , arbour , bower , or fence . They also make good container plant . plant life in containers will also bloom over winter in sunny windows .
Thunbergia , black - eyed Susan vine , clock vine related mintage : Thunbergia gibsonii has somewhat larger flowers in a bright Orange River colour . Thunbergia fragrans bears 2 - column inch all-embracing , white , fragrant flowers . The most available variety is call Angel Wings and efflorescence in about 12 hebdomad from seed .
- Thunbergia , black - eyed Susan vine , clock vine related varieties : Susie Mix is composed of orangish , white-livered , and white blush , either with or without grim centers . African Sunset roam from brick loss to cream . Salmon Shades control a variety of whitish orange .
Thunbergia alata
