Blooming Plant of
Gardenia jasminoides (gar-DEEN-ee-a jaz-min-OY-deez)
Gardenia plants are evergreen, woody shrubs that feature shiny,
dark green leaves and fragrant Camellia-like flowers that grow
to 3 to 4 inches across. The waxy petals open into flat or
dome-shaped flowers. Gardenias are prized for
their intense fragrance.
Each flower may last only five to seven days, but the plant can
last for many months with proper care. Only a few flowers are
generally open at any given time per plant.
Cultivars include ‘Mystery,’ a large, pure white bloom, and
‘Belmont,’ a smaller, creamy white variety.
Gardenia plants are available year-round, usually from local
markets and growers.
1 Upon arrival, remove the plants from the shipping boxes
by grasping their protective sleeves and lifting the plants out.
2 Carefully remove each sleeve by tearing along the seam
upward from the bottom.
3 Inspect plant variety, size and quality.
4 Remove any damaged stems, leaves and blooms.
5 Inspect each plant for disease or damage. Isolate
diseased or damaged plants, and report them to the grower or
buying office immediately.
6 Determine water needs by pressing a finger 1 inch into
the soil or using a moisture meter.
7 Water each plant, as necessary, with room-temperature
water, and allow excess water to drain from each pot.
Gardenias are somewhat sensitive to ethylene gas. Check with
your suppliers to make sure their crops are treated with an
ethylene inhibitor at the farm or during transportation.
Remove faded blooms. Don’t accept plants that show signs of
wilt, rot, mold or yellowing. Proper temperatures are necessary
for Gardenias to bloom (see “care tips,” below left).
Several insects and diseases are likely to show up on
Gardenias. Sooty mold can coat leaves and is usually due to an
infestation of aphids or mealy bugs. These sucking insects
excrete honeydew, which supports the growth of the black fungus.
In sandy soil, nematodes feed on the roots and can cause
Gardenias to be stunted or even die. Root rots caused by various
fungi also can be a problem, especially in poorly drained soils.
In-store and consumer care tips
Keep the soil moist at all times, but avoid standing water.
Irregular watering can cause bud drop. Overwatering can cause
Bright, indirect light is best for plants displayed indoors.
Keep Gardenias at a constant temperature, 65 F to 75 F,
because fluctuating day and night temperatures damage the flower
buds. Flower buds may fail to form if day temperatures are
higher than 75 F or night temperatures are lower than 60 F.
Gardenias need daily misting. Moderate humidity is required.
fertilizer Feed the plants every three weeks during the growing
season with a Rhododendron (azalea) food or acidifying
Gardenias prefer acidic, moist, well-drained soils.
Cut Gardenias back when they have finished flowering.
Some information provided by:
Chain of Life Network®,
You can reach “Blooming Plant of the Month” writer Steven W.
Brown, AIFD, at
firstname.lastname@example.org or by phone at (415) 239-3140.
Images courtesy of The John Henry Company, Lansing, Mich.
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