The UW Botanic Gardens’ maple collection — which in terms of number of species and cultivated varieties is the most diverse in the country — is showing off its fall colors these days. You can enjoy the collection firsthand on a guided tour led by UW staff horticulturists from 1 to 2:30 p.m. on Saturday, Oct. 20, or 9:30 a.m. to noon on Saturday, Nov. 3. Pre-registration is required; click here for more information or call 206-685-8033.