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Bullhorn Acacia is best known for its symbiotic relationship with a species of Pseudomyrmex ant (Pseudomyrmex ferruginea) that lives in its hollowed-out thorns. Its species were considered members of genus Acacia until 2005.
Drought-tolerant; suitable for xeriscaping.
This tree is easily propagated from seed that has been immersed in boiling water and soaked overnight. Protect young plants from frost. They are suited to medium to large gardens. Allow these magnificent trees the space to show off their wonderful shapes - don't crowd and clutter them.
This tree is half-hardy and very fast-growing with fertile soil and sufficient water, and tolerates temperatures ranging from about -2C to +40C.
This is a strange, bizarre desert plant which grows from a short, thick trunk, with only two leaves that continuously grow from their base, and a long, thick taproot. After germination, the cotyledons grow to 25-35 mm in length, and are followed shortly afterwards by the appearance of the two permanent leaves. These leaves are produced opposite that of the cotyledons, and continue to grow throughout the life of the plant, eventually growing to 2-4 m long and usually becoming split into several strap-shaped sections.
The name of genus Xanthorrhoea comes from the Greek Xanthos for yellow and rheo meaning flow, referring to a yellow resin exuded from the trunk of some species of Xanthorrhoea.
The Xanthorrhoea genus is part of the Xanthorrhoeaceae family, which is made up of small trees or perennials with woody stems. The leaves are tough and linear, and the flowers are radially symmetrical, bisexual, and spike-like.
Commonly called Grass Trees, Xanthorrhoea plants are also known as Balga Grass to the Australian aborigines, which is their word for black boy. The Aborigines probably called these plants balga because after a wild fire, the bottom leaves burn away revealing a singed black trunk with long green reed-like leaves extending from the top of the trunk giving the appearance of black figures. All species of Xanthorrhoea are very slow growing, but they are also very long lived - up to 600 years! Long straight spears of white blossoms extend from the top of the tree especially in the year following wild fires.
The glassy resin which exudes from the trunks was previously used in varnish and other products. The flakes of resin were collected from around the base of the stem, heated and rolled into balls.The flowering spikes of the grass tree were soaked in water to make a sweet drink, fresh or slightly fermented. The soft bases of the young leaves were eaten. Tough leaves were used as knives. Europeans harvested the gum to make varnishes and lacquers.
Generally frost tolerant, all Xanthorrhoea require well-drained soil and a sunny location because they are prone to root rot. They can be grown very successfully in pots.
Yucca is easy to grow in any well drained soil, acidic or alkaline, and it is moderately tolerant of salt spray and salty soils. Light: tolerates full sun to shade. Moisture: highly tolerant of drought. Propagation: Propagate yuccas from seeds or cuttings.