That first garden in Temecula, with 7 acres and 500 roses, probably belongs to Pam and Don (DrDon), who were once active in Dave's Garden and hosted the annual Southern California roundups. If it is their garden and they're present during the tour, please give them my regards.
If you still have access to DG, here's a link to Don's description of the work the rose garden on the slope entailed.
