Picture taken today, June 18th. This clematis has been flowering for a month with lots of buds on top. Trouble is I live on the top floor with a southwest exposure and the wind can really howl. In summer this can mean those lovely blossoms on top get blown to smithereens. It's in a pot and there is no calm location on the balcony ... I have a row cedars of which protect the bottom half of the plant. I would like to trim it back at the appropriate time of year to get blossoms on the trellis rather than at the top. Is there a way of doing this?