Q&A for How to Grow Gardenias

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  • Question
    Are coffee grounds good for gardenia plants?
    Maggie Moran
    Home & Garden Specialist
    Maggie Moran is a Professional Gardener in Pennsylvania.
    Home & Garden Specialist
    Expert Answer
    Yes, as gardenia plants like acidic soils with rich nitrogen content. Coffee grounds contain nitrogen so they help enrich the soil.
  • Question
    Can you grow gardenias from cuttings?
    Maggie Moran
    Home & Garden Specialist
    Maggie Moran is a Professional Gardener in Pennsylvania.
    Home & Garden Specialist
    Expert Answer
    Yes, although it is done best if the cuttings are kept in an area of high humidity until the roots take.
  • Question
    What zones do gardenias grow best in?
    Maggie Moran
    Home & Garden Specialist
    Maggie Moran is a Professional Gardener in Pennsylvania.
    Home & Garden Specialist
    Expert Answer
    Gardenias thrive best in zones 8-10, although they have been known to grow moderately well in zone 7. If you're in a zone that's cooler than this, they can be grown inside.
  • Question
    Which gardenia should I plant in Zone 9?
    Maggie Moran
    Home & Garden Specialist
    Maggie Moran is a Professional Gardener in Pennsylvania.
    Home & Garden Specialist
    Expert Answer
    Almost every gardenia is approved for zones 8-11.
  • Question
    Should I plant them in the sun or shade?
    Maggie Moran
    Home & Garden Specialist
    Maggie Moran is a Professional Gardener in Pennsylvania.
    Home & Garden Specialist
    Expert Answer
    Gardenias need full to partial sunlight. In a warmer area, this is achieved best with morning sun and afternoon shade.
  • Question
    The leaves on my gardenia are turning brown like it is dying. What is wrong and what can I do about it?
    Community Answer
    It might be getting too much sun. These plants are very sensitive to sunlight. They should really only get a few hours a day of "cool" sunlight, meaning morning sun NOT afternoon.
  • Question
    Is it normal for the bush I planed yesterday to droop?
    Community Answer
    Yes, typically most plants go through a period of "shock" after planting. If you maintain the establishment procedures, it should perk back up.
  • Question
    Do they attract bees or birds? I was thinking of putting them by doorway?
    Dvor
    Community Answer
    All flowers attract bees, so maybe consider a half-meter (about 1.5 feet) gap between the flower and the walkway.
  • Question
    Can I use rose fertilizer?
    Dvor
    Community Answer
    Yes, but your gardenias may grow better with specialized fertilizer.
  • Question
    How can I grow gardenias from cuttings?
    Community Answer
    The cuttings should be about 3 inches high. Shave the base of the stem to remove the outer bark. Dip each stem into water, then into rooting compound. Place the stems into a mixture of peat moss and perlite. Keep them in the shade, and water every few days. After about six weeks, you will have roots, and you can transplant to larger pots.
  • Question
    Can I cut the stem and plant the flower?
    Community Answer
    No. Try to cut the stem about 4 inches long at a 45 degree angle. Then, placeit in an empty water bottle filled with water. Leave it in a shady spot, and in about 4 to 6 weeks, you will have enough roots to plant it.
  • Question
    How do I treat fungus on my gardenias?
    Community Answer
    Dawn dish soap and water, half and half. Put in a spray bottle and cover all the leaves. You will see a difference within 3 days.
  • Question
    How long does the "shock"' period last after planting?
    Community Answer
    It can last anywhere from a couple days to a couple weeks. Don't fertilize in this period, it can add to the shock effect and burn the roots.
  • Question
    I planted gardenias about five weeks ago and half of the leaves are yellow. Does this mean I didn't give them enough water?
    Community Answer
    If the leaves are yellow, you might have given too much or not enough.
  • Question
    What do I do if all the leaves are falling off?
    Community Answer
    You might want to try watering daily for now, and consider moving them as well, they may be getting too much sun.
  • Question
    When planting gardenias outdoors in a pot, what can cause blooms to turn yellow?
    Community Answer
    Flowers will turn brown when exposed to moisture, such as heavy dew or rain.
  • Question
    What is causing my gardenia's leaves to turn yellow?
    Community Answer
    The leaves on the plants may turn yellow if you give your gardenia too much water, or if it is planted in bad soil.
  • Question
    I have a tree that looks just like a gardenia, but the flowers are red. What type of tree is it?
    Community Answer
    Most likely, it is a a camellia tree. They look similar but have no scent and their flowers come in pinks and reds.
  • Question
    What should be in the soil mix for a gardenia?
    Community Answer
    Gardenias need nutrients from material such as hummus or compost, but they also need acid. You can mix peat moss into a 50:50 mix of compost and native soil. Some tree and shrub mixes have an acid component already inside. Ask your nursery professional if their mix could be suitable for gardenias.
  • Question
    When can I trim the gardenia bush?
    Community Answer
    I wait for most or all blooming to stop, around the end of June, and trim my bush halfway down. My bushes are 4 and 5 feet high, with a baby one from a rooting.
  • Question
    How far do I need to pinch off the old bloom?
    Community Answer
    Just to the nearest node, branch or leaf. Oftentimes there are small flowers waiting to come out at the nearest leaf node, so don't go any farther than that.
  • Question
    What would cause the buds on my indoor gardenia plant to not bloom? It has been dormant for weeks.
    Community Answer
    Your plant needs food to produce flowers. My 3-year-old gardenias flower regularly now since giving them my leftover tropical orchid food in rain water.
  • Question
    My gardenia plant had buds when I got it, but they dried up and never opened. What should I do to get them to open?
    Community Answer
    Give the plant partial sunlight. My gardenias look amazing after I let them be on the dry side and feed them with acid plant food and rain water occasionally. Now my leaves stay green and flowers are huge. Spray regularly with neem oil to protect from bugs.
  • Question
    What would cause buds to turn yellow and fall off instead of blooming?
    Community Answer
    Tiny bugs sap the juice out of flower stems. I spray my gardenias every few weeks with natural pyrethrum and neem oil sprays.
  • Question
    What would cause my gardenia to bloom white, then turn into yellow blooms several days later?
    Community Answer
    This is the natural aging process of these flowers. They still have a strong perfume when they turn yellow.
  • Question
    What do I do if the leaves are turning yellow on my gardenias?
    Community Answer
    This is caused by too much water, especially in colder climates. We have a tropical climate, and I only water occasionally around the roots with rain water. Sometimes I mist leaves with rain water. It took me a few years to discover this method, but now my plants have glossy green leaves.
  • Question
    How tall and wide will gardenias get?
    Community Answer
    it depends on the type of gardenia you have. There are low-growing miniatures with small leaves, while larger varieties can reach 8 feet in height.
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