The Polly Hill Arboretum ushers in the new season with a busy week of programs.

On Tuesday, May 24 at 10 a.m. director Tim Boland takes a look at the wide assortment of small flowering trees that are great for foundation plantings or focal points in the home landscape. Learn about which trees to choose for year-round interest that form the basis for a diverse landscape. $5, free for members.

On Thursday, May 26 from 10 a.m. to noon join Nancy Weaver and arboretum staff for Plants, People and Volunteer Opportunities, an introduction to the many ways you can become involved at the Arboretum. Many of the arboretum’s most valued volunteers began with this popular class and went on to be trained through their docent program. Join their dedicated group of over 100 volunteers. No fee.

On Saturday, May 28 from 10 a.m. to 2 p.m. the arboretum celebrates the seasonal opening of their visitor center and plant sale season with Spring into Summer: A Celebration of Plants. In addition to plants for sale there will be special tours, garden talks, a tree raffle, family discovery tours, and more. The ArtCliff Diner food truck will be on hand with food for sale. Join Tom Clark for a special 9 a.m. early bird tour. No fee for this event.