Four Oclock Flowers Not Blooming. This disease is caused by a bacteria that attacks the plant tuber and roots. Mulch with gravel or not at all.
Four oclocks can become infected with fusarium wilt. Seedlings should emerge in 7-14 days. Jan 26 2019 The flowers remain open throughout the night and into the morning when temperatures rise and the flowers wilt.
Like daylilies four oclock flowers bloom just a single time then wilt and eventually fall off the plant.
Expect your plants to grow 1 - 4 ft. It ultimately flowers better if grown from one of those tubers than from seed. Thereafter it needs no supplemental water except in time of drought when a monthly deep watering is all thats needed. Even though it tends to become invasive because four oclock flower re-sows itself year after year it is still quite easy to control its growth by pulling out excess plants when they sprout.