Gardenias “Gardenia jasminoides” create waxy, white blooms on deep-green foliage and so are prized because of their sweet, heady fragrance. Those obtained in the florist are usually in bloom. Several owners discover forcing gardenias to rebloom difficult after the blooms fade. This plant refuses to bloom until its expanding choices are satisfied and is certain about its surroundings. It may grow outside in Sunset Climate Zones 7 through 9 through 18 and 16 .
Fertilize gardenias twice a month with acidifying fertilizer like azalea or rhododendron fertilizer to maintain a soil pH between 5.0 and 6.0. A large soil pH causes chlorosis — the yellowing of leaves and stems as a result of lack of chlorophyll — which results in a lack of bud development.
Maintain a temperature between 70 and 65 degrees Fahrenheit throughout the day-time and 62 and between 60 degrees Fahrenheit at night. When temperatures are above 65 degrees at night and fall buds which have previously shaped gardenias don’t set flower buds. They could drop buds in the event the mercury rises above 7 through the daytime and fail to set buds.
Mist often or offer trays to improve the the humidity level close to the gardenia. Low humidity causes buds to failure and fall to bloom.
Keep soil evenly moist and don’t permit it to dry between watering. Both over- or under-watering the gardenia can cause bud drop and absence of blooms.
Grow florist gardenias in light that is bright shade if planted outside or if developed inside. It’s much simpler to pressure blooming on these developed in the house, as the atmosphere is in your control although gardenia crops may be grown outside in mild climate.
Place gardenias in complete darkness for 14 hours each evening to initiate blooming. Use caution to preserve other aspects like humidity and temperature as gardenias are sensitive to environmental changes.