It will be the only specialist rhododendron exhibit and will showcase late-flowering varieties of rhododendrons and azaleas.
Millais said rhododendrons and azaleas are definitely back in vogue thanks to all the hard work by growers and the media to put them back on gardeners' "must have" plant lists.
It has been developing its breeding programme to extend the flowering season and this year is launching its Midsummer range of six deciduous azaleas at the show - the result of a 15-year breeding programme started by the late Ted Millais. He worked with some of Denny Pratt's best late-flowering varieties bred in the 1970s and hybridised them with later-flowering forms of R. arborescens and R. viscosum, which are native to the east coast of America.
This has extended the flowering season by at least 10 days to the end of June and produced scented, bushy plants. They were selected and named by Ted's son, David. Other varieties are being developed to extend flowering into August.