Here are some seed and seedpods from the gardens and the greenhouses today.
Aucuba – zone: 7a-9b 
Hesperaloe – zone: 7a-10b
Muhlenbergia lindheimeri – zone: 6a-9b 
Opuntia – zone: 7a-10b, at least
Aspidistra – zone: dependent on species 
Dalea – zone: 3a-8b