Few tropical trees formulate flowers with a perfect blue flavour . Often a blended hue of reddish blue , indigo or blueing creates a blue flower . Grow these trees in the garden where frosts never occur , typically in USDA Hardiness Zones 9 and affectionate . More cobalt to turquoise bluish colouring figure in the fruit of some tropical trees , although their flower are not blue whatsoever .

Jacaranda

Four species of jacaranda bear cornet - shaped prime in clusters atop their feathery leafage . Their blossom color snapper around blue - violet , but in different unaccented saturation varies from lavender - bluing to sky blue . Jacaranda mimosifolia bloom of youth in winter and spring , Jacaranda cuspidifolia blooms intermittently across spring and summer . Green jet black ( Jacaranda caerulea ) heyday in fountain and support coastal garden soil . Also called green ebony , the Cuban Dalbergia nigra ( Jacaranda arborea ) flower in bound with blue - violet flowers with white throat .

Mayan Lilac

Native to Mexico , the Mayan lilac ( Lonchocarpus longistylus ) grow upward of 50 to 60 foot in height and grow clusters of wisteria - like flowers in spring and summertime on its droopy branch . The flowers rate in color from blue - reddish blue to lavender to nearly white .

Lignum-Vitae

Usually regarded as shrub since they mature slowly and mature to a pinnacle of 10 to 30 human foot , lignum - vitae species produces deep - blue reddish blue to powdery blue blossom in previous wintertime and spring and sporadically across the summertime . take from either the common lignum - vitae ( Guaiacum officinale ) or the holywood or palo santo ( Guaiacum sanctum ) .

Flower Color-changing Trees

Two groups of tropical plant develop flowers that deepen from purple or blue - violet to white over metre . As the flower evanesce over two to three daylight , true blue tones may result in the changeover from purpleness to white . Yesterday - today - tomorrow ( Brunfelsia grandiflora ) and the Paraguay Jasminum officinale ( Brunfelsia australis ) give rise springtime blossoms that afford purple to glowering blue-blooded - reddish blue and become white by the third daylight . Brazilian potato tree ( Solanum wrightii ) similarly undefendable flowers first a majestic purple and then draw through shades of profane - violet as they get on to whiten .

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