Last month, a visitor delivered a small plastic bag containing several tree seeds to the Truman Library in Independence.

The seeds had fallen from trees, still standing, that survived the atomic bombing of Hiroshima in 1945. Clifton Truman Daniel, eldest grandson of former president Harry Truman, had been presented them this summer in Japan.

Library officials hope to plant the seeds in Powell Gardens and — when saplings are sufficiently mature — transplant them to the library grounds.

“The trees, like my trip, will represent reconciliation and healing,” Daniel said.

Daniel, 55, became the first member of the Truman family to travel to Hiroshima and Nagasaki when he visited in August.

He attended anniversary observances of the 1945 atomic bombings of both cities and met with about two dozen survivors of the bombings, known in Japan as “Hibakusha.” Daniel said he went as a private citizen to promote dialogue, he said — not so much about the complexities of his grandfather’s 1945 decision, but about new ways to promote a disarmament dialogue in 2012.

Daniel’s efforts pleased those who believe his participation in such discussions make them more powerful. Others, while applauding his interest, wondered whether he should consider expanding the definition of “survivors” to include American service members whose lives likely were spared when the atomic bombs made a traditional invasion of the Japanese home islands moot.

Some in Japan, meanwhile, wondered about the quality of Daniel’s intentions. One of those was a Japanese television journalist.

“The third question of her mouth was ‘Are you here to apologize?’ ” Daniel said recently from his Chicago, Ill. home.

“I said, ‘No.’

“The next question was ‘Then, what are you doing here?’ I told her I was not here to apologize, but that I was there in the name of reconciliation and healing.

“But at that point I began thinking that maybe this trip had not been such a good idea.”

Daniel traces the trip’s origins to the late-1990s when his son Wesley, then in fourth grade, brought home a copy of “Sadako and the Thousand Paper Cranes.” The book told of Sadako Sasaki, a Hiroshima girl who died 1955 from leukemia attributed to radiation poisoning.

It also described the origami paper cranes she created while ill. She had hoped to fashion 1,000 cranes but died before completing that task.

“Wesley didn’t initially make the connection between Sadako and his great-grandfather, and I reminded him of that,” Daniel said.

“I thought it important for him to know all sides of that issue.”

Two years later, a Japanese journalist preparing a story on the bombings’ 55th anniversaries contacted Daniel, who mentioned how his son had brought home the book about Sadako.

Four years later, Daniel received a call from Masahiro Sasaki, Sadako’s brother, who had seen that article.

Daniel had played no high-profile role in the debate that accompanied the 50th anniversary observances of the Hiroshima and Nagasaki bombings in 1995. Some historians had emphasized the numbing number of deaths, both American and Japanese, expected to have had occurred during a traditional invasion of the Japanese home islands.

Other historians posited that Truman may have had other options.