There are a number of Grandia Rhododendrons in the garden including Rh. sinogrande,
Rh. montroseanum and Rh. kesangiae.
Rh sinogrande is an old plant which doesn't always flower. It has magnificent foliage, the leaves can be up to 80 cm long and are a dark glossy green with a silvery indumentum. It flowers in April and the flowers are large trusses, creamy white in colour with a crimson blotch. It was discovered by George Forrest in 1931 and comes from the Himalayas.
Rhododendron kesingae is another large plant rare in cultivation. It has large glossy dark green leaves although not as large as Rh. sinogrande. The flowers are large trusses of a deep pink, there is also a white form. A relatively recent introduction from Bhutan and named after the Queen Mother of Bhutan.