There is a C. jackmanii 'Alba' that will often throw double flowers in
its first bloom flush. Most good clematis mail order sources should
offer it - not all that uncommon. Very vigorous, very easy to grow.

pam - gardengal


Tracey wrote:

where I might be able to purchase a double white jackmanni.

Double white jackmanni what? I'm probably wrong, but the
only jackmannii I know of is the Clematis jackmannii and
it's not double and it's not white.

Tracey