Not enough light, inappropriate fertilizer, possibly inappropriate potting medium, and an unadvised method of watering. Cards stacked against you, I'm afraid.

Josh

Not enough light

@greenman28 Josh, Thanks. It would be nice if you can explain about - what fertilizer should I use. - How should I apply the fertilizer - How frequently should I apply the fertilizer. - What is the method of watering.

@josephene_gw, @greenman28, I will move it to a sunnier place. Can you please advise me how to protect it from the heat because of the glass windows?

Thanks.

Not sure about heat. Mine lived in a southern window this past winter, no problem with heat now it's on the patio in full sun and blooming. 4 o'clocks have a tubor. Very popular in the south. Hope this helps. Enjoy the plant they do smell good.

@josephene_gw , can you share how your water and feed fertilizer to the plant?

@Nil13, I used the soil from another plant after I discarded the plant. I grew this 4-oclock from its seed/root. What should I use for fertilizing then? what do you mean by field soil and that it would lockup phsphorous?

Field soil is soil dug out of the ground. One of the problems with it is the aluminum binds with phosphate to form an insoluble and thus unavailable compound.Just use a balanced fertilizer like 20-20-20 or if you want to be really good with not overfertilizing any one nutrient, go with something more like a 3-1-2. I use a 2-1-2.

Yes, I would recommend a 3-1-2 fertilizer, and follow the directions on the package.

Water from the top, flowing down through the mix, the way that rain waters a plant.

Josh

Thanks. I will try to find one. It will be nice if you can put the link of the fertilizer you use.

Have never seen themm growing inside the house!! Mine are and always have been outdoors,and always bloom& bloom.