United Kingdom 
The Mrs cholomendy clematis which was a lavender blue colour last year is now a completely different colour! More like a greeney colour with slight purpley colour on the tips of petals!! Is there an explanation for this? Thanking you.
30 Apr, 2016
Answers
Likely cold spring temperatures, especially if the flowers are perfectly formed, just not showing their proper colour. Any later flowers should be fine, more info in the link below
https://www.rhs.org.uk/advice/profile?PID=349
30 Apr, 2016
Previous question
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30 Apr, 2016