Plants A-Z

Oak

Quercus

Appearance and hardiness of Oaks vary widely, but all produce acorns preceded by inconspicuous flowers...

Oak-Leaf Hydrangea

Hydrangea quercifolia

Broad, rounded shrub to 6 ft. tall and 8 ft.wide,with handsome, deeply lobed, 8-in.-long leaves that r...

Oaxaca Palmetto

Sabal mexicana

Native from Texas to Guatemala. Grows 30 to 50 ft. tall, 12 ft. wide, has bright green, 3-foot leaves....

Ocean Spray

Holodiscus discolor

Native to Coast Ranges, Sierra Nevada; north to British Columbia, east to Rocky Mountains. May reach 2...

Ocotillo

Fouquieria splendens

Native to Colorado and Sonoran deserts east to Texas and south into Mexico. Forms a 5 to 10-ft.-wide c...

Okra

Okra

Warm-season vegetable from tropical Asia. Large, erect, bushy plant to 6 ft. tall, with big, bold, dee...

Old Man Cactus

Cephalocereus senilis

Native to Mexico. Slender, columnar cactus growing slowly to 45 ft. tall in great old age; usually muc...

Oleander

Nerium oleander

Mediterranean native. Moderate to fast growth to 3 to 20 ft. tall and 4 to12 ft. wide, depending on va...

Olive

Olea europaea

From the Mediterranean. Along with palms, citrus, and eucalyptus, olives are regional trademarks along...

One-seed juniper

Juniperus monosperma

Native to southwestern U.S. and Mexico. Grows 10 to 40 ft. tall and wide. Similar to Juniperus ost...

Opium Poppy

Papaver somniferum

Believed to have originated in southeastern Europe and western Asia. To 4 ft. tall. Hairless gray-gree...

Orange

Citrus (Orange)

The commercial oranges are typified by 'Washington' navel and 'Valencia'.

Arizona Sweets is a ...