Horticulture Unlimited Inc.

Plant Guide

Little Leaf Ash
Little Leaf Ash

Fraxinus greggi

The hardy evergreen is a multi-trunk tree that grows quickly to eighteen feet with a spread of twelve to fifteen feet. Its smooth, brownish-gray bark darkens as the tree matures. This tree produces bright green leaves th…

Maguey de Pulque
Maguey de Pulque

Agave salmiana

This magnificent agave has huge, graceful, greenish-gray, curving leaves with a large leaf base. It grows five to six feet tall and spreads to ten feet. The leaves are ten to fifteen inches long with thick, sharp, browni…

Medicinal Aloe
Medicinal Aloe

Aloe vera

This is probably the most common aloe grown in the southwest desert, and reaches eighteen inches to two feet tall and six feet wide. It has clumping, thick, fleshy leaves and produces many offsets over a period of time.…

Mescal Pelon
Mescal Pelon

Agave pelona

This beautiful and rare species forms a dense rosette of narrow, toothless, glossy green leaves with a white margin and prominent red spine. It grows four to six feet tall and wide and does not produce offsets. The mesca…

Mexican Bird of Paradise
Mexican Bird of Paradise

Caesalpinia mexicana

Mexican Bird of Paradise is native to Northern Mexico. Its lush, ferny compound leaves provide a dark green backdrop for the bright yellow flower spikes that appear on the branch tips during the warm season. These flower…

Mexican Bush Sage
Mexican Bush Sage

Salvia leucantha

The colorful herbaceous plant grows in a mounded shape to four feet tall and wide with willowy, slender, arching stems that have soft, grayish-green to silvery, wrinkled-looking foliage. In late summer through the first…

Mexican Evening Primrose
Mexican Evening Primrose

Oenothera speciosa

The showy, semi-evergreen is admired for its magnificent pink, four-petal, bell-shaped flowers. It spreads in the landscape by underground rhizomes or seed to form extensive colonies growing from eight to twelve inches t…

Mexican Fencepost
Mexican Fencepost

Pachycereus marginatus

This handsome cactus has tall, columnar trunks and reaches heights of twenty feet, or more. It produces clusters of stout, cylindrical stems that resemble a pipe organ. The plant develops many arms during its lifetime an…

Mexican Honeysuckle
Mexican Honeysuckle

Justicia spicigera

Mexican Honeysuckle is a small shrub that isn’t fussy, blooms most of the year, and is attractive to hummingbirds. With yellow-green leaves and bright orange flowers, Mexican honeysuckle grows 2 to 4 feet tall and spread…

Mexican Tree Ocotillo
Mexican Tree Ocotillo

Fouquieria macdougalii

The interesting and rare, semi-evergreen is admired for its intertwined, spiny green branches. It grows upright and slowly to twenty feet tall and about four feet wide, but most specimens reach only six to eight feet tal…

Mount Lemmon Marigold
Mount Lemmon Marigold

Tagetes lemmonii

Mount Lemmon Marigold is native to Southern Arizona. It makes a great desert xeriscape perennial shrub. Mount Lemmon Marigold was originally collected in Southeastern Arizona in the late 1800s by the Lemmons, a husband a…

Mulga
Mulga

Acacia aneura

Mulga is a striking evergreen that grows to a moderate fifteen to twenty feet with a ten- to twelve-foot spread. It is an upright, broadleaf tree with dense, needle-like, silvery-gray foliage that gives it an interesting…

New Mexico Century Plant
New Mexico Century Plant

Agave neomexicana

This showy, low-growing agave grows two feet tall and two to three feet wide, forming a tight rosette. Its powdery blue leaves are broad with black or burgundy colored, heavily armed spines along the side of its foliage…

Night Blooming Cereus
Night Blooming Cereus

Cereus repandus

The cactus is admired for its knobby branches, flowers that open at night and red, apple-like fruit. It is a moderate grower, reaching heights of ten to twenty feet with a spread of fifteen feet or more. However, the var…

Ocahui Agave
Ocahui Agave

Agave ocahui

This agave, which was used for its strong fibers, grows two to three feet tall and three feet wide. It has a dense rosette of dark green, narrow, yucca-like leaves. Its foliage is stiff and flat at the top with straight,…

Ocotillo
Ocotillo

Fouquieria splendens

The Ocotillo is a mainstay of Arizona desert landscaping. It is made of many spiny unbranched stems with bright orange-red flowers. The Ocotillo plant is unrivaled for its graceful form and makes a wonderful accent plant…

Ocotillo
Ocotillo

Fouquieria splendens

This tall, graceful deciduous shrub with long canes grows slowly to twenty feet tall with a fifteen-foot spread. It has spiny, sharp, pole-like stems and light to dark green, oval, two-inch leaflets. The ocotillo grows u…

Octopus Agave
Octopus Agave

Agave vilmoriniana

Octopus agave is a medium to large accent plant, growing to 4 feet high by 6 feet wide. The leaves are medium green, long and narrow, and deeply channeled. The leaves undulate and twist, showing why this plant is called…

Old Man Cactus
Old Man Cactus

Cephalocereus senilis

The slow-growing cactus reaches about twenty feet or more in its native habitat, producing many columnar stems that are usually un-branched. Its species name, senilis, comes from the Latin word meaning old man. As the na…

Orange Jubilee
Orange Jubilee

Tecoma Hybrid ‘Orange Jubilee’

Orange Jubilee is an upright shrub that can grow up to 12 feet tall and 8 feet across if not frozen back for a couple of winters. The rich green, lush looking foliage gives this hybrid shrub a subtropical appearance. The…