Seed Needs, White 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. White Four O' Clock will grow to a mature height of roughly 12 to 36 inches tall, attracting an array of beneficial insects to the garden. The seeds of this plant are poisonous, so it is recommended that you keep them from children and small pets. 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 Four O' Clock 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.