Rhododendron, Camellia & Magnolia Group: What It Is and How to Join
The Rhododendron, Camellia & Magnolia Group (often shortened to the RCM Group) is a worldwide society of enthusiasts devoted to three plant genera — rhododendrons, camellias, and magnolias — and it operates in association with the Royal Horticultural Society (RHS). If you grow any of these plants, or want to, the group is best understood as a membership resource: it exists to help people at all levels of expertise with classification, cultivation, and care. The site itself describes its purpose as "an ever expanding resource concerning the classification, cultivation and care of Rhododendrons, Magnolias & Camellias for enthusiasts at all levels of expertise."
What the group actually is
The name says it plainly: three groups of plants, one group of enthusiasts worldwide. Rather than being a single-genus society, the RCM Group brings together people interested in all three genera under one organisation connected to the RHS.
That structure matters if you grow more than one of these plants. A rhododendron grower who also keeps camellias does not need to split attention across separate societies — the RCM Group covers the shared ground of cultivation and care.
What it offers enthusiasts
The group's stated focus is classification, cultivation, and care, aimed at "enthusiasts at all levels of expertise." In practice that means the value is educational and communal rather than commercial:
- Cultivation and care guidance — how to grow and look after rhododendrons, magnolias, and camellias.
- Classification information — understanding what distinguishes plants within and across these genera.
- A worldwide community — connecting with other enthusiasts, not just those in one country.
- A resource that keeps expanding — the site presents itself as growing over time rather than fixed.
If you are a beginner, the "all levels of expertise" framing is the relevant signal: the material is not pitched only at specialists. If you are experienced, the classification and care depth is where the interest lies.
How to join and get involved
The site's own framing centres on the idea of joining a group of enthusiasts, and membership is the natural route to its resources. Because the RCM Group is associated with the RHS, the RHS is the sensible starting point for membership details, current terms, and any fees.
A practical sequence:
- Go to the group's site (rhodogroup-rhs.org) to see what it covers and how it presents membership.
- Check the RHS connection — since the group operates in association with the RHS, RHS channels are where you confirm joining mechanics and any costs.
- Confirm current terms before assuming anything — the available material does not state prices, payment methods, or whether access is free, so treat cost and login requirements as things to verify rather than assume.
A note on cost and access
The source material contains no pricing links, no payment platforms, and no statement that membership or access is free. Do not assume the resource is free or that no login is needed — check the site and the RHS directly for the current position.
Where it fits if you grow these plants
The three genera have different needs, and the group's value is that it addresses them together while still treating classification and care seriously. For a grower deciding whether to engage:
- Choose the RCM Group if you want cultivation and care information across rhododendrons, camellias, and magnolias, plus contact with enthusiasts worldwide, under an RHS-associated umbrella.
- Look elsewhere if you need only a single genus, or if you want commercial purchasing rather than cultivation and classification knowledge — the group's stated purpose is the latter.
The clearest next step is to visit rhodogroup-rhs.org, read how the group describes itself, and use the RHS link to confirm membership specifics before committing.