Information About Bottlebrush Grass

Information About Bottlebrush Grass

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What Is Bottlebrush Grass – How To Grow Bottlebrush Grass Plants

By Mary Ellen Ellis

Ornamental grasses are popular in gardening because they are easy to grow and provide a unique look you can't achieve with flowers and annuals. Growing bottlebrush grass is a great choice for a perennial grass with a very distinctive look. Learn more here.

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With their vibrant red blooms, bottlebrush plants (Callistemon citrinus) remain a popular addition to home gardens and landscapes. Not only do home gardeners love the rich, red flowers, but they also love how a bottlebrush tree attracts butterflies and hummingbirds. Bottlebrush plants usually thrive in USDA hardiness zones 8b to 11, as they love a mild climate. Once established, they require some maintenance but not a lot, providing another reason to love them.


Bottlebrushes facts and health benefits

Bottlebrush Quick Facts
Name: Bottlebrush
Scientific Name: Melaleuca citrina, Callistemon citrinus
Origin Australia
Shapes Small woody fruits that contain hundreds of tiny seeds

Bottle bush plant is an Australian native evergreen shrub or a small tree ranges in size from 0.5 meter woody shrubs to 5 meter woody trees. They are mostly found in the more temperate regions of Australia, particularly along the east coast and typically favor moist conditions so when planted in gardens thrive on regular watering. They often grow in damp or wet conditions such as along creek beds or in areas which are prone to floods. However, two species are found in Tasmania and several others in the south-west of Western Australia. At least some species are drought-resistant and some are used in ornamental landscaping elsewhere in the world. The shrub thrives in clay, loam and sand soils that are moderately fertile, moist but well drained. Poor soil should be mixed with compost to improve drainage. Bark is grey in color with interlacing ridges with numerous, long, slender and drooping branches.

Bottle bush plant has sharp pointed, light green, narrow lanceolate leaves that are up to 3 to 7 cm long and 5 to 8 mm wide. The veins of the leaves are clearly visible on both sides.

Bottle bush plant has vibrant flowers that are cylindrical shaped, the color being produced by the filaments, at the end of these is where the pollen is formed adding to the natural beauty of the flower. The flower spikes are 6 to 10 cm in length and about 4 to 7 cm in diameter. Ranging from crimson reds, bright pinks oranges and yellows flowers in dense cylindrical spikes. The stamens are red, purplish-red, or lilac and the anthers are dark-colored. Flowering normally takes place from November through to the end of February.

Each flower produces small woody fruits that contain hundreds of tiny seeds. These fruits form in clusters along the stem, and are usually held on the plant for many years. The seeds are usually not released from the fruits for several years, but in some species the fruits open after about a year. The seed capsules, which appear in clusters along the stems, are woody, cup-shaped, and about 7 mm wide.

Native to Australia, bottlebrush trees and shrubs (Callistemon spp.) get their name from the flower spikes that form in spring or summer. There are currently 40 species in this genus. The bottlebrush is a woody shrub native to Australia. Most bottlebrushes occur in the east and south-east of Australia. Bottlebrush shrubs can be found growing from Australia’s tropical north to the temperate south. They often grow in damp or wet conditions such as along creek beds or in areas which are prone to floods.

Bottlebrushes Types

The following bottlebrushes grow well in most temperate parts of Australia and have been successfully grown at the Gardens.

1. Callistemon brachyandrus – Prickly Bottlebrush

This prickly-leaved shrub grows best in well-drained soils in full sun and is an outstanding plant for hot, dry areas. The tips of the small red flower-spikes are covered in yellow pollen and are most attractive. The rounded shrubs grow to about 3 m.

2. Callistemon citrinus – Crimson Bottlebrush

This hardy shrub is probably the best known bottlebrush and is widely cultivated. The bright red flower-spikes appear in summer and autumn. Crimson Bottlebrush grows well in wet conditions and usually reaches 4 m. Plants should be lightly pruned and fertilized after flowering. Neglected or misshapen plants respond to hard pruning.

3. Callistemon formosus – Kingaroy Bottlebrush

This attractive shrub is appropriate for tropical and frost-free areas. Plants grow to 3 m tall and have weeping branches. Lemon-colored flower spikes are produced throughout the year. It is planted as street tree in Kingaroy, Queensland.

4. Callistemon pallidus – Lemon Bottlebrush

It is a tough, frost tolerant species which grows well in most soil conditions. Plants grow and flower best in full sun. The lemon-colored flower spikes are produced in summer. Plants grow to about 3 m.

5. Callistemon pityoides – Alpine Bottlebrush

This very hardy and attractive bottlebrush is available in several forms. The alpine form is especially attractive and grows as a compact bush to about 1 m tall. Other forms grow as erect shrubs to about 2 m. Yellow flower spikes are produced in spring and summer. Plants grow best in moist soils. Alpine Bottlebrush can withstand heavy pruning if required. It is frost hardy.

6. Callistemon salignus – Willow Bottlebrush

This small tree has attractive narrow foliage and white papery bark. It is drought resistant and quite hardy, although it can be affected by the frost in cold climates. The flower-spikes are generally white or greenish but pink, red and mauve forms can be found. An excellent garden and street tree which grows 5 to 12 m tall.

7. Callistemon subulatus

This compact shrub grows from 1 to 3 m tall and is able to tolerate quite wet conditions. Callistemon subulatus is a freely flowering plant which produces red flower spikes over summer. Light pruning after flowering will keep the shrub compact.

8. Callistemon viminalis – Weeping Bottlebrush

This large bottlebrush is widely cultivated. Plants produce bright red flower spikes which are very rich in nectar and attract many birds. Plants grow in a variety of soils, but can be frost tender, especially when young. Weeping Bottlebrush grows 5 to 7 m tall.

Traditional benefits of Bottle bush plant

  • Used as diuretic and for relieving problems of the urinary tract.
  • Used by women as douche to cleanse the genitourinary tract from excessive menstruation or mucosal discharge as leukorrhea.
  • Used for urinary incontinence and bed-wetting in children.
  • In Jamaica, decoction used as “hot tea” treatment of gastroenteritis, diarrhea, and skin infections.
  • Indigenous people of Australia used the bottle brush flowers as a natural energy drink.
  • Bottle brush essential oil is used to harmonize a room or house bringing tranquil healing vibrations.

Other Facts

  • The shrubs are used as foundation plant in borders, around parking lots and on the side of water pools for landscaping purposes.
  • A tan dye is obtained from the flowers, it does not require a mordant, and is green when mordanted.
  • Wood is hard, heavy, tough, close grained, but too small for economic use and is used for tool handles.
  • It is also used for fuel.

Bottle bush Facts

Bottlebrush plants (Callistemon spp.) get their name from the spikes of flowers that bloom at the ends of the stems, bearing a strong resemblance to a bottle brush. Grow them as shrubs or small trees that grow up to 15 feet. Most bottlebrush varieties bloom over a long summer season in shades of red or crimson. One exception is C. sieberi, which has light yellow flower spikes. Bottlebrush plants need a very mild climate. If you live in an area cooler than USDA plant hardiness zones 8b through 11, grow bottlebrush in pots that you can move to a protected area for winter. Use a rich, peaty potting soil with a few handfuls of sand added to improve the drainage. If pruned hard every year, the plants will grow in pots as small as 6 to 8 inches in diameter. If you plan to let the shrub grow, you’ll need a large tub.


  • *Acorus calamus – Sweet Flag
  • *Acorus gramineus – Dwarf Sweet Flag
  • *Alocasia macrorrhiza – Giant Alocasia
  • Arisaema triphyllum – Jack-in-the-Pulpit
  • *Asclepias incarnata – Swamp Milkweed
  • Aspidistra elatior – Cast Iron Plant
  • Aster novae-angliae – New England Aster
  • Astilbe x arendsii – Astilbe
  • *Canna species – Canna
  • Chelone species – Turtlehead
  • Cimicifuga species – Bugbane
  • *Colocasia esculenta – Elephants Ear
  • Convallaria majalis – Lily Of The Valley
  • *Crinum americanum – Swamp Lily
  • Crinum species – Crinum
  • Eupatorium purpureum – Joe-Pye Weed
  • *Filipendula species – Meadow Sweet
  • Galium odoratum – Sweet Woodruff
  • Hedychium species – Ginger Lily
  • *Helianthus angustifolius – Swamp Sunflower
  • Hemerocallis hybrids and species – Daylily
  • *Hibiscuscoccineus – Scarlet Swamp Hibiscus
  • Hibiscus species – Rose Mallow
  • Houttuynia cordata – Houttuynia
  • *Hymenocallis – Spider Lily
  • *Iris ensata – Japanese Iris
  • *Iris hybrids – Louisiana Iris
  • *Iris laevigata – Rabbitear Iris
  • *Iris pseudacorus – Yellow Flag
  • Iris sibirica – Siberian Iris
  • *Iris virginica – Southern Blue Flag
  • *Leucojum aestivum – Summer Snowflake
  • Ligularia species – Ligularia
  • *Lobelia cardinalis – Cardinal Flower
  • *Lobelia siphilitica – Blue Cardinal Flower
  • *Lysimachia clethroides – Gooseneck Loosestrife
  • *Lysimachia punctata – Yellow Loosestrife
  • Malvaviscus arboreus – Turks Cap
  • Mentha species – Mints
  • Mertensia virginica – Virginia Bluebell
  • Monarda species – Bee Balm
  • Myosotis scorpioides – Forget-Me-Not
  • Physostegia virginiana – Obedient Plant
  • *Rhexia virginica – Meadow Beauty
  • Smilacina racemosa – False Solomon’s Seal
  • Tiarella cordifolia – Foam Flower
  • Tradescantia virginiana – Spiderwort
  • Tricyrtis formosana – Toad Lily
  • Vernonia noveboracensis – Ironweed
  • *Xanthosoma atrovirens – Taro
  • *Zantedeschia aethopica – Calla Lily
  • Zephyranthes atamasca – Atamasco Lily
  • Zephyranthes candida – Rain Lily
  • Asperula orientalis – Blue Woodruff
  • Impatiens varieties – Impatiens
  • *Mimulus alatus – Monkey Flower
  • Solenostemon cultivars – Coleus
  • Viola cultivars – Pansy

Para obtener la versión en español de esta hoja informativa, consulte HGIC 1718S, Plantas para Represas o Áreas Húmedas.

If this document didn’t answer your questions, please contact HGIC at [email protected] or 1-888-656-9988.

Author(s)

Karen Russ, Former HGIC Horticulture Specialist, Clemson University

This information is supplied with the understanding that no discrimination is intended and no endorsement of brand names or registered trademarks by the Clemson University Cooperative Extension Service is implied, nor is any discrimination intended by the exclusion of products or manufacturers not named. All recommendations are for South Carolina conditions and may not apply to other areas. Use pesticides only according to the directions on the label. All recommendations for pesticide use are for South Carolina only and were legal at the time of publication, but the status of registration and use patterns are subject to change by action of state and federal regulatory agencies. Follow all directions, precautions and restrictions that are listed.


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