Gardenia Flower Not Opening. To avoid this problem maintain an evenly moist soil but avoid overwatering as gardenias do not like wet feet. Nov 18 2020 Get the Best Mortgage Rate for You Moisture and Nutrients.
I keep a watering ball in mine. Gardenias need at least 1 inch of. Mulch your gardenia plants with a 2- to 3-inch-deep layer of ground bark or compost and fertilize in the spring after the threat of frost has passed.
Over-watering or under-watering.
Use a well-balanced acid-forming extended-release fertilizer and repeat this process six weeks later. Adjust the soil if necessary. While gardenias purchased from a florist can be summered outside it is hard to. If your Gardenia does not bloom this may be caused by any of these reasons.