Geranium (cranesbill) trial 2025–2027

Objectives and purpose of the trial

The purpose of this trial is to showcase a range of hardy herbaceous Geranium (cranesbill) cultivars available to gardeners. Geraniums are an attractive and popular plant that can be long-flowering, and come in a range of forms and colours. A large trial of Geranium took place from 2002–2006 at RHS Wisley, Surrey. Since then, there have been hundreds of new cultivars introduced, with many of these thought to be significant improvements on previous cultivars. This trial will compare, record and display the merits of new additions against established cultivars, as well as identify the correct nomenclature (naming) for the species and cultivars in the trial. Those that perform best will be awarded the RHS Award of Garden Merit (AGM).

Geranium ‘Elke’ shines with vibrant pink petals

Geranium sylvaticum ‘Album’ blooms among lush foliage

Judges and criteria

Judging criteria

The following factors are all taken into consideration as part of the judging of the trial:

• Plant habit, floriferousness and foliage
• Length of flowering period

• Drought resistance
• Pest and disease resistance

Get in touch

For more information on our RHS Plant Trials or to access older trial reports, please get in touch with our team via email at trials@rhs.org.uk.