If you have the expansion for the raised flower beds, you can always just set up the one free bed (and maybe buy a few more), plant bright orange plants that give orange petals, and make money selling those while getting the seeds (renewal and bright orange seeds to replant) on the side. As the beds don't require maintenance, it's passive. Or, if you have a cook or tailor, plant stuff that gets you resources and seeds (cocoa, vanilla, flax, etc. If only sugar cane provided seeds)