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Having a plant flower for the first time is always exciting.
When you have never seen the flower ''in the flesh'' it is even more exciting and one of the things from which gardeners take great pleasure.
At the back of the Clive Lister Garden pond at Dunedin Botanic Garden is an unusual little deep-rooting perennial, Rheum alexandrae.
It has large, oblong-to-ovate leathery leaves, an unbranched stem and small white panicles of flowers, partly hidden by large, creamy, yellow papery bracts.
They protect flowers and seeds and make the plant a standout or even an oddity in the garden.
As the bracts age, they become streaked burgundy and in autumn, leaves take on fiery orange tones.
Native to lush marshes, damp meadows and stream sides in the high altitudes of western China, it is well-suited to damp situations such as a pond edge or bog garden.
It can also be a showpiece in the mixed border or a cool moist area in the herbaceous border.
Able to handle frosts to -15degC, it also tolerates full sun or partial shade.
It can grow in a wide range of soils, although deep fertile soils are preferred.
They can be tricky to grow.
At Dunedin Botanic Garden some have been planted over the years but many have died and very rarely, if ever, have we managed to get them to flower.
It may be the favourable location in which this particular specimen is growing or it might be plain good luck.
• Stephen Bishop is curator of the Clive Lister Garden at Dunedin Botanic Garden.