Gardenia is often found in many homes and it bears many beautiful flowers.
Key Gardenia facts
Name – Gardenia
Family – Rubiaceae
Type – indoor plant, shrub
Height – 6 ½ feet (2 meters) outside and 1 ⅓ to 3 feet (0.5 to 1 meter) indoors
Soil – soil mix
Exposure: well-lit – Foliage: evergreen – Flowering: end of spring → mid-fall
Care, watering, pruning and repotting should help you enhance the blooming.
Planting and repotting gardenia
Growing gardenia isn’t always easy, particular care must be provided to boost gardenia growth and blooming. First of all comes planting and repotting.
Indoor gardenia
Gardenia is most often used indoors in temperate climates because cool winters makes it impossible to grow gardenia out in the open.
- It is recommended to plant your gardenia in good flower plant soil mix.
- Select a very luminous location but without any direct sun.
Outdoor gardenia
Planting gardenia outdoors is only possible if the climate is warm in summer and mild in winter, because it cannot survive freezing.
- Choose a spot that is protected from wind, a bit sunny but not too exposed, part shade ideally.
- Mix the earth from your garden to soil mix, heath and dried leaves or river sand.
- Gardenia also requires well-drained soil.
Repotting gardenia
If you’re growing your gardenia in a pot, repotting every 2 to 3 years is prescribed. The plant needs space to grow, and a tight pot would alter its development.
- Wait for the plant to show it needs more space before repotting.
- Best repot the gardenia at the end of winter or at the beginning of spring.
- In certain specialized horticulture stores, special gardenia soil mix can be found.
Propagating your gardenia
Cuttings with gardenia
The best way to multiply gardenia is cuttings, even though this technique isn’t always crowned with success.
Prepare cuttings at the beginning of spring.
- Select cuttings about 3 to 4 inches (8 to 10 cm) long.
- Pinch off lower leaves, keeping only the topmost pair of leaves.
- Dip the cutting in powdered rooting hormones.
- Plant the cuttings in special cutting soil mix or in a blend of peat and river sand.
- Place your cuttings in a well-lit place, without direct sun. Ensure air moisture levels stay high (you can cover the cuttings with a garden cloche or clear plastic to increase moisture levels).
- Keep substrate a little moist.
- Repot young plants when the cuttings have already formed nice leaves.
Marcotting gardenia
You can also try marcotting (also called air-layering). It’s similar to cuttings, except that the branch remains attached to the plant.
Basically, the goal is to wrap the branch with a clump of moist soil.
Roots will develop. Then, simply cut the branch off and plant it to a pot!
- Scar bark along the branch with a blade (lengthwise, not round and round the branch). It’s ok to remove a sliver of bark and reveal the wood beneath.
- Slip the whole branch through a plastic sheath that’s about 3 inches across and 6 inches long (15 cm). You can also simply use plastic food wrap or swaths of gauze.
- Two inches (5 cm) below the mark, tie the pouch or plastic to the branch.
- Fill it with a blend of soil-mix, sand and garden soil (a few handfuls of each). It shouldn’t be too clayish.
- Extend the soil-filled space along the branch for a further 4 inches (10 cm).
- Moisten the soil (wet but not soggy) and tie the top shut.
Every couple weeks, check the moisture and add water if necessary.
- An easy way to do this is to have a small slit in the plastic.
- You can stick your finger in it. If it feels dry, squirt water in with a hand spray (a syringe is easier).
- Close the slit with tape.
Voilà ! Your marcot is going to sprout roots in the area with the soil. This will take around 3 to 4 months at most. At this point, you can cut the branch from the mother plant at the bottom of the marcot and pot it up. Remember to keep the plant away from direct sun at the beginning, until roots develop more.
- Again, ensure moisture in the air to make sure your marcotted branch survives.
Watering gardenia
Gardenia doesn’t like hard water, so it is always best to water from collected rainwater or bottled mineral water.
- It needs to be watered with rain water or mineral water if the water from your tap is very hard.
- It also requires constant moisture levels.
- During the blooming, take care not to get the petals wet, since this will cause blemishes on the flowers or discolor them.
How to provide constant air moisture
To recreate the moisture in the plant’s natural environment, you can place the pot on a bed of clay pebbles or gravel, and ensure the space between these is filled with water.
- other ways to ensure humidity around a plant
The water will slowly evaporate and remain in the vicinity of the plant: you have just re-created the plant’s native tropical environment!
Watering gardenia in spring and summer
It is important to water regularly without flooding the plant.
Wait for the surface of the soil to have dried out before watering again. Since gardenia needs very moist air to grow well, spray water on the leaves, but stop doing so as soon as the plant is in full bloom.
Watering your gardenia in fall and winter
Reduce the watering. Wait for the substrate to have dried out down to about as deep as your index finger will reach. When the soil is dry to that point, water again.
Pruning and caring for gardenia
After the blooming, prune your shrub lightly to retain its tight, compact shape while reducing the branches by â…“.
Remove wilted flowers regularly, since this stimulates production of new flowers.
In order to reinforce the plant and produce spectacular blooming, provide it with special heath plant fertilizer.
Repotting in spring every 2nd year in a blend of heath and soil mix is needed to bolster proper plant growth.
Diseases and parasites on gardenia
When grown as an indoor plant, gardenia may encounter most diseases, insects, parasites and mites that attack house plants in general.
Most common parasites are aphids, scale insects and red spider mites.
- Here is how to fight off scale insects
- How to effectively stave off aphids
- And lastly, how to treat against red spider mite
Note that if your gardenia leaves turn yellow, but the veins and ribs stay green, you’re probably dealing with chlorosis resulting from water that is too hard.
If the flowers fall off before opening up, lack of ambient air moisture is certainly the cause. Spray soft water on the leaves and unopened flowers, but stop when the flowers have opened up or spots will appear.
Learn more about gardenia
Gardenia is certainly one of the most beautiful indoor plants.
Native to tropical and sub-tropical regions of Africa, Asia and Oceania, people usually love it for its abundant flowering. Additionally, gardenia releases a soft jasmine-like fragrance.
This plant will adapt to living indoors very well, as long as moisture levels are very high. Never place it near a radiator or heat source. It’s important to keep it from dehydrating.
Outdoors, it requires very mild climate, without any frost or freezing in winter.
During winter, freezing would kill the plant, and you’ll have to bring it inside for protection.
Smart tip about gardenia
After having purchased your gardenia, wait for the blooming to end and repot the plant: this will stimulate development and proper growth.
I just bought my gardenia plant from store. It started blooming and has lots of buds. I feel like I’m having to water twice a week to keep it from drying out. (The soil is dry about 2 in deep) I’m thinking it’s the soil. Maybe I need new potting mix. It also started getting yellow leaves. It sitting in a window with blinds and sheer curtains. Sunlight about 4-5 hours a day. I do live in a 5 zone. CO. My question is should I repot? I feel it’s early in spring to repot, but I don’t wanna stress my gardenia tree and kill it. I also bought a small humidifier because CO is so dry. Please any advice is helpful. Thank you.
Hi Olivia, nurseries often use soil that drains extremely well, and they tend to water once and sometimes even twice a day to speed growth up for their plants before selling them. Therefore, you’re correct in thinking repotting is needed. Go ahead and do it now! It will of course stress the plant a little bit, but the benefits of having fresh soil and a larger pot will make it worthwhile. You can get special gardenia soil, or if there isn’t any available, get heath plant soil instead (it just has to be a bit acidic and drain well). Repotting like this will make your twice-a-week watering routine more effective, though you might want to water every other day for a time until roots form throughout the entire new potting soil.
Nice job getting a small humidifier, too. Here are other tips to increase air moisture around your houseplant.
2 weeks ago when I fell, I tripped on my gardenia plant. It broke a limb partly, but the branch still has green leaves and new growth on it. Is there any way that I can finish disattaching the limb to have it continue to grow?
Dear Mary, I hope you didn’t hurt yourself in the fall! But better the gardenia breaking a limb than you :p
Gardenia will cope well enough with cuttings, if you wish to remove the branch. Simply make a clean cut and follow the usual steps for cuttings (removing lower leaves, ensuring moisture, using rooting hormones, etc). If the branch is long, you can make several cuttings at once, each about 4 inches or 10 cm long.
Another option is to make the best of the break and go for air-layering, also called marcotting. Hopefully the instructions are clear enough to easily be followed! If the branch is bent you can use Popsicle sticks to make a splint for the time it takes for roots to grow.