Small to medium flowers, opening dark purple becoming cobalt blue. Dark blue pistils. Filaments white, tinged violet at the base, connective violet. The breeder places this cultivar in the 'Jackmanii group' which is part of the wider 'Late large-flowered group'.

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 Database entry: 3698
People:  Click the name(s) for information about:
	Wim Snoeijer