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Plant Notes

PLANT OF THE MONTH: March 2006
Isopogon formosus

Rose Cone Flower

            Pat Knight brought Isopogon formosus, interesting for the beauty of its foliage as well as the rosy purple flowers. A native of Australia, it is a small, evergreen shrub to 5 ft. The foliage is alternately divided into short narrow segments, very firm, almost stiff. The flower is a star-burst of slender tubular flowers springing from a compact head, 2 ins. across. Bloom proceeds spirally upward from the base of an acorn-shaped bud, each lilac-colored tube opening at the tip into 5 thread-like lobes and a long, exerted yellow stamen.

            The form of the flower looks like a member of the Asteraceae, but actually is in the Proteaceae. The plant is slender and erect but responds to shaping. It must have a well drained sandy soil. Avoid fertilizers with phosphorus. In the summer water once a month or less. Give a very small amount of nitrogen once a year if needed. Sunset zones 15-24.
Western Horticultural Society
P.O. Box 60507,   Palo Alto, CA 94306
(650) 948-4614 or (650) 941-6136
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