This sounds like your petunias just went into a vegetative state. This can happen sometimes when dead heading all flowers during summer months, because plants are very influenced by light cycles. The species you have should tell you what seasons or time frame it should flower. You may also want to check if it is getting too little sunlight due to the movement of the shadows, depending on the sun's position in the sky. As long as the vegetative growth is continuing, though, it should be fine and just may need a little more water or food (sometimes I will through in some molasses with regular food to give it a little kick to bloom again). If it is in a container, though, it may be getting rootbound and it would be time for a larger container or some more regular pruning to keep the plant's size limited. The last part I would say is that it may also need a fresh soilless mix or a good root system flush followed by a light inoculation of mycorrhizae to help facilitate nutrient and water delivery and storage. Also remember that soilless mixes are organic material that can become soil after a while, and this could decrease the drainage as well. I hope this helps! I tried to cover as much as possible, since I am unsure of the specifics of the other factors. Good luck! :)
This sounds like your petunias just went into a vegetative state. This can happen sometimes when dead heading all flowers during summer months, because plants are very influenced by light cycles. The species you have should tell you what seasons or time frame it should flower. You may also want to check if it is getting too little sunlight due to the movement of the shadows, depending on the sun's position in the sky. As long as the vegetative growth is continuing, though, it should be fine and just may need a little more water or food (sometimes I will through in some molasses with regular food to give it a little kick to bloom again). If it is in a container, though, it may be getting rootbound and it would be time for a larger container or some more regular pruning to keep the plant's size limited. The last part I would say is that it may also need a fresh soilless mix or a good root system flush followed by a light inoculation of mycorrhizae to help facilitate nutrient and water delivery and storage. Also remember that soilless mixes are organic material that can become soil after a while, and this could decrease the drainage as well. I hope this helps! I tried to cover as much as possible, since I am unsure of the specifics of the other factors. Good luck! :)