ClimbersEasy CarePet Safe
Blue Sky Vine
Thunbergia grandiflora
Blue sky vine is a very vigorous climber with hanging clusters of large, pale blue trumpet flowers for much of the year. It quickly covers pergolas and fences but needs firm control.
Botanical FamilyAcanthaceae
Native RegionIndia and Southeast Asia
Growth RateFast
Mature SizeClimbs 10–15 m
Bloom PeriodMost of the year
Common NamesBengal clock vine, Nil lata, Blue trumpet vine
Photo: Don McCulley · CC BY-SA 4.0, via Wikimedia Commons
Essential Care Requirements
Light
Full sun, Partial sun
Watering
Moderate
Water regularly in dry weather.
Soil
Rich, well-drained soil; pH 6.0–7.5.
Temperature and humidity
8–40 °C · High humidity
Feeding
Feed lightly a few times a year.
Pruning and propagation
Propagate by stem cuttings, layering
Prune hard after flowering to keep it in bounds.
Not known to be toxic.
Top Cultivation Tips
Give a strong pergola.
Keep away from trees, which it can smother.
Invasive in some regions; do not let it spread to wild areas.
Flowers attract carpenter bees.
