This is called “allelopathy,” and sweet autumn clematis scoffs at it — in case you have any walnuts (or pecans) growing nearby. The scientific name is a fun sidebar in its own right.

Sweet autumn clematis has been announcing the advent of fall for several weeks with its displays of billowy masses of star-shaped white flowers. Now that other perennials are weary and preparing for ...

The vine is sweet autumn clematis (Clematis paniculate or Clematis maximonowicziana). It is a vigorous vine, native to New Zealand, that is related to the cultivated spring-blooming clematis.

The vine is Sweet Autumn clematis (Clematis paniculate orClematis maximonowicziana). This is a vigorous vine, native to New Zealand, that is related to spring blooming cultivated clematis.

But "Sweet Autumn," the most widely known of the summer blooming types, is no wimp. It is a vigorous vine that isn't appropriate for the smaller trellises commonly sold for clematis.