From the U.S. Postal Service announcement on October 22, 2019:

Contemporary Boutonniere is a new Forever stamp similar in design to the new 2-ounce Garden Corsage stamp. It can be used for wedding RSVP cards and is also perfect for party invitations, thank-you notes, announcements, birthday cards, Father’s Day cards and other occasions when a beautiful stamp is fitting. The stamp features a photograph of an arrangement of a burgundy mini-cymbidium orchid bloom, a succulent and a touch of green hydrangea, accented with loops of variegated lily grass. These materials are on trend for today’s modern designs, as arranged by floral designer Carol Caggiano and photographed by Renée Comet. Art director Ethel Kessler designed the stamp.

Additional information will be posted below the line, with the most recent at the top.

This stamp was issued Thursday, April 2nd, in Crestwood, Kentucky.

The Scott Catalogue number for this issue is 5457.

Updated March 23rd:
The first-day ceremony for this stamp has been canceled. The stamp will still be issued on April 2nd. More details will be announced closer to the issue date.

Updated March 6th:
Here are the first-day postmarks for this issue:The Digital Color Postmark measures 2.98″ x 1.35″The pictorial postmark measures 2.62″ x 0.96″

Updated March 4th:
[press release]
Save the Date: Boutonniere and Corsage Stamps Arrive in April
New Stamps Perfect for Mailing Wedding and Other Invitations

WHAT: The U.S. Postal Service introduces two stamps for many of life’s special moments. The Contemporary Boutonniere Forever stamp and the Garden Corsage 2-ounce stamp form a natural pair.

The first-day-of-issue event for these stamps is free and open to the public. News of the stamps is being shared with the hashtags #BoutonniereStamp and #CorsageStamp.

WHO: David E. Williams, chief operating officer and executive vice president, U.S. Postal Service

WHEN: Thursday, April 2, 2020, at 11 a.m. ET

WHERE:
Yew Dell Botanical Gardens
6220 Old LaGrange Road
Crestwood, KY 40014

RSVP: Dedication ceremony attendees are encouraged to RSVP at www.usps.com/boutonnierecorsage.

Background: These new stamps reflect the organic style popular for today’s floral designs. Photographs of a boutonniere and corsage were used as the artwork for these chic stamps.

The Contemporary Boutonniere stamp is well suited for RSVP envelopes included inside wedding invitations. It is also a perfect touch for thank-you notes and announcements, in addition to regular correspondence. The 2-ounce Garden Corsage stamp can accommodate the weight of heavy invitations, oversize greeting cards, and mailings that require extra postage.

The flower arrangements in both of these designs create beautiful botanical presentations.