How do I know if my plant is rare or threatened?

To start off you will need to know the full botanical name of your plant; if you are not sure you can ask at your local Plant Heritage Group meeting, take to a local nursery, or ask the RHS if you are a member. If it is a plant for which there is a National Plant Collection, you may be able to ask the advice of the Collection Holder.
Once you know the name, you can check it online, or in a paper copy of the RHS Plant Finder – as a rough indication, the fewer nurseries that are stocking your plant, the more likely it is to be rare enough to register within the Plant Guardian scheme. If it has more than five entries it is unlikely to be Threatened, if it has just one there is a good chance it is. If you are not sure, register it anyway, we check all the plants that you input!
When you register the plant online, we will check it for you, and let you know if it qualifies or not. We use the methods used in the Threatened Plants Project to assess cultivars and a combination of the TPP methods and the IUCN Red list for species. 
Anuual membership

Donate and support Plant Heritage

"By supporting the Threatened Plants Appeal, you will be instrumental in not only safeguarding it, but also ensuring that our work carries on." Alan Titchmarsh

Alan Titchmarsh

Johnsons Seeds raising money for Plant Conservation

Johnsons Seeds will donate 25p to Plant Heritage from all sales of 'Pink Pearl' - from its new World Botanic Seed Range

World Botanic seed packs
Reg. charity No 1004009/SC041785      Reg Company No. 2222953