If the plant produced the wood early enough this spring, then the wood could be considered old wood and that is probably why your Proteus is blooming doubles on it. The same can happen to the alpinas and the macropetalasa and a lot of the type IIs which are supposed to bloom on old wood. Wood formed early enough in the current season can have blooms on them in the late summer.

The one thing that is curious is that in her book 'Simply Clematis', Edith Malek claims that Piilu requires both old wood and a winter chill to produce double blooms. Now nowhere in the book does she specify what constitutes a winter chill (i.e. how low of a temperature and for how long). Did the weather cool down any in August when you began getting your rain? Perhaps it cooled enough to accomplish the winter chill she refers to. By the way, I am jealous of your rain. None here except for a one hour shower two weeks or so ago and that is it for going on 6 weeks. With temps in the 90s that has further exacerbated the problem.

Congrats on your double blooms on Piilu. I have had the plant for 4 years and it has never produced double blooms. Would love to see pictures.

Hi Miguel. Here are some pics of my Piilu.

Here's what it normally looks like in the spring:

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Here's what it looked like this spring:

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and here's what it is looking like now:

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Lovely Jackie! I have Proteus and Piilu planted together and can get doubles on Proteus but never had them on Piilu. Love that iron fencing Piilu is growing on!

I see you get that green sepal phenomenon on your clematis also. I usually see this in the spring and have read it can be caused by cool temps during bud formation, but I have also seen it happen on blooms that develop during the heat of the summer.

How Gorgeous...just call me pea-green with envy...mine had only one bloom this year and it is year 3 boohoo..Jeanne