A Blooming Melon-drama

If you go northwest of Mortimer in town to an abandoned house, that usually has ravages so be careful, then go southeast from that abandoned house to the botany conservatory it has blue fireflies and think you have to get it growing AT NIGHT TIME. At least that's when I found it growing. https://map.corepunkers.com/?marker=7710,11456

Here is where I found it
https://map.corepunkers.com/?marker=7710,11432

1. Rose: https://map.corepunkers.com/?marker=7710,11456 (I used @Berserker@2329's answer) look in the bed of lit up grass/brush.
2. Guitar: https://map.corepunkers.com/?marker=7516,12392 Look for Jahri Roots, on his blanket there is a guitar, interact with it.

I found the Rose here: https://map.corepunkers.com/?marker=7710,11456

Rose
https://map.corepunkers.com/?marker=7724,11461.78362511866

Red Rose in the center of all of the blue flowers https://map.corepunkers.com/?marker=7716,11444

Red rose: https://map.corepunkers.com/?marker=7708,11428

https://map.corepunkers.com/?marker=7712,11446 red rose

Rose:
https://map.corepunkers.com/?marker=7714,11454
guitar:
https://map.corepunkers.com/?marker=7448,12458

guitar near Jahri
Rose:
https://map.corepunkers.com/?marker=7786,9748