Four Oclock Flower Soil Conditions. 4 Oclocks flower best in full sun but they can tolerate some shade. In colder climates they are grown as annuals or at the end of the season the tubers are be dug up and stored indoors during the winter like dahlia tubers.
The plants are. Dig a good shovelful of fine rich compost about a foot deep below surface level to accommodate four oclocks long taproot and be ready to keep the area consistently moist during and beyond germination. Grown as perennials in US.
4 Oclocks flower best in full sun but they can tolerate some shade.
Here is a great article about this wonderful perennial. Planting four oclock flower April to May for plants purchased in nursery pots or containers. Sow seeds about 6 inches apart and cover with. Fill a 3-inch starter pot.