Castlecliff gardener Phil Holden says he has some great memories of his friend and mentor Chris Cresswell, who died in a cycling accident on Saturday.
One of the many projects Dr Cresswell supported was the community gardens in Matai St, Castlecliff, where Mr Holden is curator.
"I'm trying not to feel sad because that was not his message," said Mr Holden.
"He wanted to empower and enlighten people and he was always such a good, attentive listener."
Although Dr Cresswell led a busy life, he would drop by the gardens for a catch-up and he donated plants and a wood chipper to the project.
"Last time he was here, he took a photo of one of the quotes written on the wall in the sleep-out," said Mr Holden. "He really liked it and I think it was really appropriate for him."
The quote, from musician Mike Love, is about making life a celebration, and Mr Holden says he thinks Dr Cresswell did that with his own life and encouraged others to do the same.
Sustainable Whanganui has added a post to its Facebook page expressing a similar tribute.
"Chris Cresswell exuded a joy and gave so much to so many," the post reads.
"His loss will be felt by the many, many he touched, not just in Whanganui but beyond.
"He was a unique combination of professional and activist and generous spirit and many many more things.
"But the loss to his fabulous family is heartbreaking and reminds us what matters most."
Dr Cresswell's wife, Mandy, and her family have extended an invitation to those who wish to pay their respects and celebrate his life with a powhiri at Pakaitore/Moutoa Gardens, Taupo Quay, Whanganui, at 11.30am and the service following at 1pm next Saturday.
As Mr Cresswell loved all things green, people are encouraged to wear green garments.
Mr Cresswell, who was 49, is survived by his wife Mandy and children Caitlin, Connor and Sammie.