Database of Extant Rhododendrons, Camellias and Magnolias
The first step towards realising our ambitions is to learn what is still in cultivation; only then can we know what we have lost. Luckily, we have excellent historic records to help us better understand the situation.
For the last eight years we have been assembling a list of extant plants of our three genera. Data is drawn from botanic and other major publicly accessible gardens, from the collections of our members as well as those from other societies, and from the general public who volunteer the information when they hear of our work. Checked carefully for naming against the international registers, we can determine rarity and assess the need for propagation to ensure a robust population is in existence.
This is a work in progress but the database currently records:
*The rhododendron and camellia species lists are still being created and will appear in due course
** As more data enters the list, these statistics will be updated.
As well as identifying rarity, rhododendrons, camellias and magnolias ‘lost’ from the gardens where they were raised are being identified, propagated and returned.
Help us to expand this database by sending a list of the rhododendrons, camellias and magnolias you grow to email@example.com
Conservation through micropropagation
The most recent threat to our three genera in the UK was the arrival of a rapidly spreading disease – Phytophthora ramorum – which can particularly affect ornamental rhododendrons and eventually kill them.
The South West of England was seriously impacted and this is where some of our most important collections of rhododendrons are to be found. This called for quick action both to eradicate the disease and to save the collections.
Luckily, the research facility at the Duchy College at Rosewarne is also in the South West, and thanks to external funding a rescue programme was set up there utilising a procedure known as micropropagation.
Licences were granted to use diseased plant material and a major conservation effort was launched. The speed of this initiative, together with the innovative work of Ros Smith, ensured that over 300 unique rhododendrons were saved.
The basic process involves stimulating plant cells (taken from fully developed floral buds) to develop into tiny growing shoots which can be grown on and eventually weaned towards independence, ready to be planted out.
With Phytophthora ramorum mostly under control, external funding ceased but the conservation work of the laboratory goes on, now focussed on conservation of varieties threatened by other risks or made vulnerable through their rarity, often uniqueness. This is where the Rhododendron, Camellia and Magnolia Group has stepped in to help.
Thanks to the vision and commitment of John Harsant, in 2008 the Group embarked on a project to help preserve the ageing collection of Aberconway hybrids at Bodnant Gardens. With our financial support, twelve of its threatened rhododendrons were selected and micropropagated, and the famous ‘Penjerrick Walk’ re-established using the same technique.
Since that time, we have continued to support the Duchy College Laboratory in its efforts, through regular donations. We have developed an excellent working relationship with the team there, now led by Dr Naomi Beddoe with Ros Smith semi-retired but almost always in the lab!
Through supporting micropropagation we:
You can read more about the history and the process in these two articles which you can download
Rhododendron 'Royal Mail' photograph (c) Russell Beeson
Conservation through conventional propagation
Where it is possible, threatened rhododendrons are propagated from cuttings. This is a much quicker process but not suitable for diseased material or where vigorous shoots are not available. Very often, micropropagated plants are raised from the last surviving flower buds on a dying plant.
At the moment, rare camellias can only be propagated from cuttings or grafts. Luckily we have an excellent propagator working with us who is accustomed to working with less than perfect material.
With magnolias we are similarly fortunate to have an exceptional propagator who has managed to graft rarities for us so that we can distribute them to other gardens and raise the chances of their survival.
Conservation through identification
Maybe you have rhododendrons, camellias or magnolias in your garden you don’t know the name of and would like to. Maybe your garden contains plants of great age and there could be something rare or important growing there?
How can we help you?
Sadly, we aren’t able to come to your garden to identify what you are growing but if you send us high resolution photographs of flowers, leaves, bark and the whole plant, and tell us what size these features we will do our best to identify them for you and give you an idea of their importance. Please send to firstname.lastname@example.org