This is Amazing Stories for June-July 1953, cover by Barye Phillips. The ISFDB entry for this issue is here. I found this version of the cover at mycomicshop.com. You can download and read this issue at the Internet Archive.
Pulp Parade #292: Whatever you do, be sure to bring back seeds
That astronaut looks an awful lot like James Garner!
Just don’t pick them until they are fully ripe!