Defined as zona 6b and 7a on the U.S. Department of Agriculture Plant Hardiness Zone Map , Oklahoma can experience minimum temperatures of minus 5 degrees F in the northerly part of the state . The State Department ’s biggest metropolis , Oklahoma City , is in zone 7a , which nominally is warm in the winter . Several frigid - unfearing tropical plants , including palm variety , can survive in Oklahoma with proper guardianship . tropic plants used in colder climates are best suit for southern exposures and should be protected from wind by a fence or anatomical structure . In addition , adding an extra layer of mulch to the tropic plants before winter will protect root .

Chinese Windmill Palm

The Chinese Windmill Palm ( Trachycarpus fortunei ) is among the most cold - Oliver Hardy of medallion and can flourish in southern Oklahoma , though it should be protect from idle words , as the leaf may tear . This palm can grow to 40 foot and produces fan - mold fronds , each on a flat , individual stem from a slender , central trunk . The Chinese Windmill Palm is native to southeastern China and Taiwan , and should be plant in full sun in Oklahoma . This works needs regular water system and dead or damaged leave should be pruned .

Hardy Hibiscus

Also acknowledge as the rise mallow or swamp mallow , the fearless hibiscus ( Hibiscus moscheutos ) is brave in all of Oklahoma and produces the largest flowers of any hibiscus , up to 12 inches across . This flora can grow to 8 feet and blooms from tardy June until the first frost . The hardy hibiscus has jag , oval foliage and bloom are available in pinks , loss and white . In Oklahoma , this hibiscus should be protected from wind and will die back in winter . It should be implant in full sun and involve regular piddle during growing time of year .

Sago Palm

Technically a cycad , the sago palm ( Cycas revoluta ) is among the oldest plants on the major planet and can endure winters in zona 7a ( southern Oklahoma ) with security . These evergreen plants produce a rosette of large , spiky , fern - same fronds from a central understructure . aboriginal to Japan , sago palms may grow to 10 feet , though they are very slow agriculturist . Leaves are up to 3 feet long . In Oklahoma , sago palms may be planted in full to partial sun and require steady water . These plants should be richly mulched before winter and may be covered during particularly dusty snap , as rime harm may occur .

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