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.

This week’s Mystery Plant, Sweet autumn clematis, Clematis terniflora, makes really wonderful, sweet odors…but I am afraid that the plant itself is a bit odious.

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.