
Unusually this clematis is sold under two trade names HAPPY BIRTHDAY and JEWEL OF MERK. The latter is in honour of a Mrs Pawson, living in the UK, who celebrated her 70th birthday in June 2009. Merk is her pet name.
| Group: | Late large-flowered group |
| Approximate height: | 2.5 - 3.0 metres |
| Flowering period(s): | Jun Jul Aug Sep |
| Aspect: | Sunny |
| USDA zones: | 5 6 7 8 9 |
| Pruning: | Hard prune (Group 3) |
| Raised by: | Wim Snoeijer |
| Country of origin: | Holland |
| Date raised: | r1999 s2002 i2009 |
| Parentage: | withheld |
| Other name(s): | JEWEL OF MERK |
| Further detail: | Flower diameter: 6-10cm Tepals: 6; 5cm long, 3.5cm wide, overlapping, touching |