Horticulture Unlimited Inc.

Plant Guide

Soaptree Yucca
Soaptree Yucca

Yucca elata

This historic yucca grows six to twenty feet tall or more with an erect, upright trunk and spreads eight feet wide. Its showy, white, bell-shaped flowers are the state flower of New Mexico. The plant was named for the su…

South African Aloe
South African Aloe

Aloe lineata

This compact, tropical, medium-sized aloe grows two to six feet tall and two to three feet wide, forming many clusters as it matures. It produces small rosettes of yellowish, dark green to lime green, smooth foliage with…

Southern Live Oak
Southern Live Oak

Quercus virginiana

This majestic evergreen grows forty to fifty feet tall and almost as wide with a broad, rounded canopy, horizontal branches, and thick, leathery, green leaves. During cold winters, the tree defoliates and new green leave…

Spanish Bayonet
Spanish Bayonet

Yucca aloifolia

Spanish Bayonet is a large, sprawling yucca. In Southern Arizona, it reaches an average height of about 10 feet tall and clumps to about 10 feet wide. Growth is slow. Stiff, dense leaves are medium green with sharp point…

Spanish Dagger
Spanish Dagger

Yucca gloriosa

The fast-growing, tropical-looking yucca grows ten feet tall and eight feet wide and can form single or multiple trunks. It has sword-like foliage that originates from the center of the plant. The leaves are bluish-green…

Squid Agave
Squid Agave

Agave bracteosa

This low-growing agave with an irregular appearance reaches heights of about two feet tall and wide. It has an interesting clumping rosette of spineless, bright-green, candelabra-like leaves. The foliage emerges from the…

Striped Century Plant
Striped Century Plant

Agave americana var. striata

This is one of the rarest and most beautiful of all the agaves. It foliage is blue-gray with creamy white markings and multiple, white stripes that run throughout the length of the leaves. The plant grows six to eight fe…

Sunset Aloe
Sunset Aloe

Aloe dorotheae

This low-growing aloe with stiff, shiny leaves grows two to three feet tall and twenty inches wide, producing many offsets. It forms a clump of rosettes or spirals on very short stems that stay low to the ground. Its lea…

Sweet Acacia Tree
Sweet Acacia Tree

Acacia farnesiana

Sweet acacia is a small to medium-sized tree that grows to 20 ft. tall and develops a 20 foot canopy. Fragrant, golden yellow, puffball-like flowers appear from October to March. Flowers are followed by short, dark brown…

Sweet Potato Vine
Sweet Potato Vine

Ipomoea batatas

Sweet potato vine is fast-growing reaching heights of six to twelve inches with a spread of one to three feet. It has dark green or deep purple, heart-shape, lobed leaves. The variety ‘Blackie’ has the darker purple foli…

Sweet Violet
Sweet Violet

Viola odorata

The fast-growing, long-lived evergreen reaches four inches tall with aromatic, violet flowers and small, heart-shaped foliage that is slightly serrated and dark green in color. It grows in a rosette with creeping runners…

Texas Ebony Tree
Texas Ebony Tree

Ebenopsis ebano

Texas ebony tree grows quite well in Southern Arizona. Native to the Chihuahuan desert, this highly decorative tree is remarkably drought tolerant. Under ideal conditions, it grows to 30 feet tall with an equal spread. M…

Texas Mountain Laurel
Texas Mountain Laurel

Calia secundiflora (formerly Sophora secundiflora)

The Texas Mountain Laurel <em>(Calia secundiflora)</em> is well-known for its pendulous clusters of purple, fragrant flowers that look as good as they smell. This popular plant is often used as a flowering, evergreen shr…

Texas Olive
Texas Olive

Cordia boissieri

Texas olive is an evergreen to semi-deciduous tree reaching fifteen to twenty feet tall and about twenty-five feet wide. It has multiple trunks with a dark gray bark and deep green, oval leaves that are large and leather…

Texas Sage
Texas Sage

Leucophyllum frutescens

Its durability, easy care, and beautiful blooms have made Texas sage one of the most popular shrubs in Southern Arizona. These tough, desert-adapted plants provide the backbone for many desert gardens. Mostly evergreen,…

Thompson Yucca
Thompson Yucca

Yucca thompsoniana

This amazing, slow-growing plant resembles Yucca rostrata but is somewhat smaller, reaching six to twelve feet tall and six feet wide. It has symmetrical, columnar rosettes of stiff, thin leaves and its foliage is greeni…

Thorncrest Century Plant
Thorncrest Century Plant

Agave lophantha

This agave produces single or clumping rosettes reaching two feet high and four feet wide. It is admired for its numerous, dark rich-green to pale green, glossy leaves that have a whitish-yellow strip that runs along the…

Thread-leaf Agave
Thread-leaf Agave

Agave filifera subsp. schidigera

This agave is admired for its decorative, dark-green to bronzy-green, sword-like, narrow foliage. The plant grows quickly to two feet tall and two to three feet wide. The foliage has white markings and fibers along the e…

Threadleaf Milkweed
Threadleaf Milkweed

Asclepias linaria

This erect, shrubby perennial grows three feet tall and wide with needle-like, grayish-green foliage that is covered in fine hairs. From March through October, it produces showy, white flower clusters with pinkish-burgun…

Thunder Cloud Sage
Thunder Cloud Sage

Leucophyllum candidum

This stunning, irregular-shaped shrub grows five feet high and four to five feet wide with small, hairy, silvery white foliage. The stems are twiggy when young and become woodier with age. Small clusters of bluish-violet…