locate in Zone 8 on the U.S. Department of Agriculture Plant Hardiness Zone Map , Portland , Oregon partake in the same zone as Tifton , Georgia and piece of Texas , but the mood is quite different . While temperature in these areas do not traditionally deteriorate below 10 F , Portland lacks the humidness of the south . It is , however , protected from coastal influences by the Coast Range of slew . The growing time of year in Portland is about 275 days and rainfall is restrained .
Some tropical plant grow well in this surface area , however , wind may deplumate delicate leaves .
Bougainvillea
Bougainvillea ( Bougainvillea spectabilis ) is an evergreen , fruticulose vine that can add color to any landscape and does well in Portland ’s temperate climate . Bougainvillea gets its gloss from the large bracts that surround the belittled white flush the plant bring forth . These bract may be vibrant Battle of Magenta , white , deep red or yellow . The vine , which has a spiky radical , may be trained to grow up a treillage or bulwark .
Bougainvillea has fragile ancestor ; be measured not to damage them when you imbed bougainvillea . Cut the container off the industrial plant , rather than pulling the plant out to protect the etymon . Bougainvillea may be planted in full sun in Portland and requires moderate piddle once it is established .
Canna
Cannas ( Canna ) are tuberous - rooted perennials that are aboriginal to the Torrid Zone , but do well in Portland ’s moderate climate . Because the soil does not freeze in Portland , these industrial plant may stay in the land yr round , but will die back in cold-blooded conditions . canna grow on upright stalks , have folio that resemble those on banana trees and a showy flower spike at the top . These plants disseminate apace and may become invasive .
well used in borders or in a grouping of multiple industrial plant , canna are available in a reach of colors and sizes , including the Rover Bellflower ( C. rapunculoides ) , a uncompromising plant which does well in hard grunge and the Peach - Leafed Bluebell ( C. persicifolia ) , which is useable with blooms of blue , pink or bloodless and grow to 3 feet .
Cannas should be planted in full sunshine and require sizable water during the growing season .
Tree Mallow
tree diagram mallow ( Lavatera arborea ) is a tropic - look plant whose blush resembles the hibiscus , but is smaller . An evergreen plant bush in Portland , tree mallow is easy - to - grow and provide a showy bloom in pinks , rosebush and whites throughout the summer . This works , which can grow to 8 ft , has leaf that resemble maple .
The bicolor variety ( L. maritima ) has pinkish flowers of up to 3 inches with royal centers , while the L. thuringiaca mixed bag has purple - pinkish flowers and blossom nearly year round .
Sir Herbert Beerbohm Tree mallow should be plant in full sunlight and requires regular to little water .
