Seed Needs, Yellow Four O' Clock (Mirabilis jalapa) 60 Seeds Quality Four O' Clock seeds packaged by Seed Needs. Packets are 3.25" wide by 4.50" tall and come with a full colored illustration on the front side, as well as detailed sowing instructions on the reverse. Yellow Four O' Clock will produce gorgeous Yellow colored blooms that flower throughout the summer months. The trumpet shaped blooms are 1 to 2 inches wide and sit atop stems and foliage that grow anywhere between 12 to 36 inches tall. Aptly named, the Yellow Four O' Clock flowers will start to open up in the evening hours, around 4pm. Four O' Clocks are grown as a tender perennial flowering plant. These beauties will grow a deeply established root system, later wilting on the surface with the first frost. They return the following year from roots and will flower normally. All Mirabilis seeds sold by Seed Needs are Non-GMO based seed products and are intended for the current & the following growing season. All seeds are produced from open pollinated plants, stored in a temperature controlled facility and constantly moved out due to popularity.