Years ago I had discovered these beautifully flowered fragrant beauties hiding amongst the unwanted plants in the swale of my front yard. At that time I had thought the 4 o'clocks were pretty but toxic. It turns out there is mixed and conflicting information put there regarding Mirabilis, but Plants for a Future states that it has an edibility rating of 2 out of 5. And has been used in the past for medicinal purposes. And hallucinatory purposes.
The leaves are edible, but not the seeds or the roots. Other sources say the roots are edible. Be cautious.
I'm going to propagate this plant. It grows well year after year here and often creates seedlings in unexpected places.