The potted hibiscus tree is a popular plant across the US in the springtime. They find a home on front porches, out on back patios and decks. Personally, I like to see the tropical Hibiscus grown as a tree. For tips on how to care for these colorful flowered beauties. Read on…
What a difference a week makes. The flowers are starting to pop on the Hibiscus trees. It is truly a beautiful sight to see thousands of plants with red, pinks, oranges, and yellows all starting to bust out to show off their colorful flowers.
We’ve discussed – Florist Grade Hibiscus – now we’ll look at the other Hibiscus, the ones grown as small potted trees for patio or terrace color as well as potted specimens in front yard landscapes.
Page Contents & Navigation
- 1 Growing The Hardy Hibiscus In The Nursery
- 2 How To Make A Hibiscus Braid: Video
- 3 Characteristics of the Outdoor/Patio Hibiscus
- 4 Hibiscus Care
- 5 Pruning Hibiscus Plants And Roots
- 6 Lots of Sunshine
- 7 Growing Hibiscus As Patio Trees
- 8 Hibiscus Propagation – Making Cuttings
- 9 Winter Protection Of Hibiscus
- 10 Using Hibiscus As Landscape, Hedge and Foundation Plantings
- 11 Flowers Alone Deliver Garden Color Interest Indoors
- 12 Vibrant and Colorful Hibiscus
- 13 Hibiscus Pests Control The Usual Suspects
- 14 Hibiscus Tree Plant Trivia, Questions & Answers
- 15 A Round Up On Caring For Potted Hibiscus
Growing The Hardy Hibiscus In The Nursery
You’ll find “Florist Grade” hibiscus plants grown as bushes in Greenhouses. The outdoor/patio types are grown outside as bushes also, but we find a lot of Hibiscus trees grown or what are called “standards” produced outdoors.
Bush type hibiscus start life from cuttings. Most Hibiscus trees are started from air-layers. Air-layers are a commonly used propagation method for plant material (that is a whole story in itself).
Stock plants grow in the ground and reach a height of 6-8 feet. The branches are trimmed, removing the side branches making one long straight stem (which stays on the tree) about 36 inches long. The base is then wrapped with sphagnum moss and foil to retain moisture.
Roots form and begin growing into the moss. These air-layers are removed from the stock plants and planted into containers. Each stock plant can produce 50 to 100 plants per year.
After planting the plants are trimmed, and shaped into forming a small tree. This process takes 12 months for a 10” plant. Some growers take 3 or 4 air-layers and braid them together.
How To Make A Hibiscus Braid: Video
Characteristics of the Outdoor/Patio Hibiscus
The outdoor/patio tropical hibiscus is taller, more open, and has lighter colored leaves than those grown as ‘Florist Grade’.
The facilities producing the outdoor/patio type are:
- Outside growing areas (acres and acres)
- Overhead irrigation
- Some method to keep the plants from blowing over in the wind.
Placing your Hibiscus tree in full sun will produce the most flowers and best growth. Try to keep the plants out of windy areas.
Hibiscus plants will thrive outdoors where the night temperature doesn’t drop below 50 degrees. Hibiscus are used outdoors in tropical climate landscapes. Avoid excessive cold and hot areas.
It is important you keep the soil of the patio hibiscus moist at all times. Saturate the soil at each watering.
To test and see if you need to water, place your fingers on the top of the soil; if it feels dry to the touch, it is time to water your Hibiscus.
When growing outside water your plant at least 3 to 4 times a week.
Hibiscus requires plenty of water. However, they do not like to sit in water. Avoid overwatering and allowing Hibiscus to sit with “wet feet.” To prevent root rot plants should drain completely drain after waterings.
Avoid using cold water, especially during winter months, when watering your hibiscus. This tropical plant prefers water around 95 degrees. Always check the water temperature with your hand to ensure it is not too hot and never too cold.
Patio hibiscus responds well to balanced plant fertilizers like this. If you want lots of flowers, you’re going to need to fertilize your potted hibiscus. Select a balanced fertilizer such as a 20-20-20 or a specially formulated Hibiscus fertilizer. Trace elements such as iron and magnesium also help hibiscus thrive. A water soluble fertilizer at 1/2 strength can also be applied.
Easy Hibiscus Delivers Colorful Results
Given sun, moisture, good drainage and a temperature which stays above 32 degrees the year round, hibiscus will reward the grower with blossoms almost continuously but most prolifically during the summer and fall months.
Even in the north the gardener need not be without them. They make wonderful large pot plants for a sunny window and may be placed outdoors on the patio in the summer.
Plants may set too many buds for the root development to support and some or all of the buds will fall for a time. Fertilizing and additional humus will usually take care of this.
Pruning Hibiscus Plants And Roots
Prune the branches of your hibiscus to maintain the desired shape. The only reason to prune Hibiscus is to enjoy more flowers and keep the plant in balance. Pruning will also help to stimulate more growth and more shoots.
To keep your plant looking healthy, establish three to four main branches of the plant. Select the most sturdy and upright branches when pruning and allow those to become the main stems of the plant. Remove any weak or sideways growing branches.
When repotting, you may want to root prune the root ball. Remove any weak, sick looking or ailing roots gently but firmly. When pruning use the rule of thirds. Never prune more than one-third of the root or the plant. When in doubt, err on the side of caution and don’t remove it.
Hibiscus flowers open daily and last for only one day, after which they die. Your plants will probably have flowers which opened during transit, fallen off and started to rot.
This is normal! Simply remove all wilted or unsightly flowers and keep grooming daily.
While visiting your garden center keep this in mind. Hibiscus plants are heavy drinkers and aggressive feeders. Look for plants that are full with good color. I’ve never seen plants get the care they need during their brief visit at the garden center. They will probably need a good drink when they get to their home.
Plants losing their bottom leaves can be a sign of not enough water and drying out, or plants being in transit too long.
Lots of Sunshine
Plenty of sunshine is necessary to make hibiscus plants grow sturdy and to produce blooms. To insure good branching, pinch growing tips when small.
If the pinching is done just above an outside bud, the new growth will branch out into a desirable bush.
Hibiscus flowers are borne on the young wood, and a heavy pruning is in order every year so that plenty of new growth can develop without the bush becoming too large for indoor growing.
Hibiscus thrive under fluorescent light culture. Place plants under the tubes, so the top of the foliage does do not quite touch the tubes.
Hibiscus matensis, a species with variegated pink, silver and green leaves, has been known to thrive and flower all winter under fluorescent lights.
A fluorescent unit can be made of two 48-watt tubes. Given much humidity and 12 to 15 hours daily illumination, Hibiscus does well under the lights.
Growing temperatures should range from 60 to 65 at night to 75 during the daytime.
Growing Hibiscus As Patio Trees
A tall, bushy plant, three feet tall, will thrive in an eight-inch pot.
Hibiscus is not particular about soil or potting mix. It will combat root rot and nematodes best with plenty of humus added, and maintaining a neutral pH.
Soil with perfect drainage with a rich and humusy growing medium will yield excellent results. An African Violet soil like this is usually satisfactory for hibiscus.
Here is a recipe for hibiscus potting soil:
- 1 part garden loam
- 1 part peat moss
- 1 part fine bark and sand
Hibiscus use significant amounts of water, and outdoors during the hot summer plants may require watering every day. This free use of water quickly leaches out plant food in the soil. When using a liquid plant food, fertilizing is necessary every week.
A plant food with too much nitrogen will produce lots of foliage, and not enough flowers. A well-balanced food or special Hibiscus fertilizer will help plants produce large, well-colored blossoms, and in usual quantity.
If you purchase a plant that comes in a small pot and the leaves are rather banged and bruised, cut the top back partially to give the roots a momentary rest and then a chance to grow.
A plant without a good root system cannot be expected to continue to produce a floriferous plant.
Hibiscus Propagation – Making Cuttings
Although the shrub first came from eastern Asia, it has proved its adaptability in subtropical areas where gardeners are enthusiastically searching for new types to add to known varieties.
Hibiscus propagate easily from softwood cuttings or leaf bud cuttings from March to September. Use hard wood cuttings almost any time of the year. Many commercial growers propagate Hibiscus from air-layers.
Use a rooting medium of sand or peat moss and perlite and treat the cuttings with rooting hormones. Or, if the grower is a green thumber, 6 to 8-inch lengths of stem with two or three leaves or half leaves at the top may be put into a bed which will be kept moist and, presto, they’ll grow and bloom.
The rooted cuttings then may be potted until they are transferred to larger containers or to permanent beds.
They will root in water, or they may be started in a moist mixture of peat moss and sand, or in vermiculite. When roots form, they should be potted into regular soil.
Cuttings rooted under fluorescent lights can be potted in six weeks’ time, and flowered in less than a year.
Grafting is done to secure blooms from rare varieties on older rootstock more vigorous than its own. If grafting fascinates you, graft five or six Hibiscus varieties onto one root stock.
Starting Hibiscus From Seed
Hibiscus seeds are large enough to handle easily, and blossoms come in about 18 months. Plants seeds in vermiculite, peat moss, or sand – best of all, a mixture of the three.
To set seeds on a plant, simply place loose pollen from one bloom into the little pads of stigma at the top of the pistular column of another bloom.
All varieties are not fertile, but a little experimenting will teach which ones will set seed. You can purchase Hibiscus seeds here.
Winter Protection Of Hibiscus
When temperatures dip to the 30’s hibiscus may freeze to the ground. In such cases it may recover slowly or not at all.
Plants may be covered and protected. Sudden changes in temperature are not easy to meet since warm days are interrupted by chilling, blustery north winds called “northers.”
Hibiscus thrive outdoors in the summer. When moving them outdoors in May or June, thin out weak wood and prune to make the plant as shapely as possible. Keep the plant in partial shade to acclimate.
Using Hibiscus As Landscape, Hedge and Foundation Plantings
When used as a hedge Hibiscus may be kept trimmed for a semi-formal look but will produce few blooms. Planting Hibiscus in clumps looks most attractive.
Hibiscus make fine specimen plants but are not well suited for foundation planting, especially if the landscaping plan calls for formal or semi-formal design. Plant them along the sides or the back of a house where a tall plant is needed.
When used in this way near the house, most homeowners cut them to two feet or less in height late each fall or cut back the older wood to the ground.
If not done many Hibiscus varieties grow too large for the average house. Take your pruners (we love our Felco #2 for pruning) and cut back the older wood. This does not decrease bloom since hibiscus flowers on new wood.
With no standardized names for hibiscus varieties, especially in the newer hybrids, a name may prevail in one section of the country for a red and to a yellow in another area.
If you’re looking for a particular variety the safest method, unless you see the blooming plants in a nursery, is to beg a cutting from a friend, who has the variety.
Flowers Alone Deliver Garden Color Interest Indoors
These brilliant plants add color interest to the garden and are equally useful as cut flowers.
Gather blooms without foliage to use in a cluster on a mirror or tray, or to string along some willowy bamboo straws or palm ribs to add tropical charm to daytime decorations.
Cut flower buds early, on the morning they are to open, and placed in the refrigerator until a few hours before they are to being used. Brought into the light they will open and hold their beauty for almost the twelve hours nature intended for them.
This method “tricks” them into evening use. They give a wide choice in color from white through delicate pinks, yellows, peach and lavender tints, to the most brilliant red and orange shades.
In Mexico, these and other hibiscus or mallows are called Tulipan. Down in southern Texas, Hibiscus syriacus is known as althea, Hibiscus palustris (moscheutos) is mallow, rose mallow or Mexican Hibiscus and Hibiscus mutabilis is Confederate rose or flower-for-a-day. The hibiscus is the only one called by its genus name.
The hibiscus is known as shoe-black plant in China because of the use made of a dye from the petals. It is said that the flowers can be rubbed on shoes in place of shoe polish when one needs a shine.
The botanical name, Hibiscus rosa-sinensis, or rose of China elevates it above this association with us.
Vibrant and Colorful Hibiscus
I do not think I have ever seen a hibiscus with a flower that was not colorful and vibrant. You can select from reds, maroon to rosy red, pinks, lavender and white shades along with orange tones.
Each grower who specializes in hibiscus can add names to the list, and each collector will continue to admire new hues and search for new types. “Hibiscus-mania” is developing rapidly and growers are not always able to supply the demand for newer types.
Other hibiscus grow in the south, but die to the ground in the winter or loose their leaves.
Northern gardeners who grow these shrubs in pots move them inside during the winter. Pot and tub grown plants cannot develop to outdoor size and beauty except under special conditions.
The hibiscus will continue to be a shrub for the extreme south and an increasingly popular one.
The hibiscus is of the shoe-flower family, and closely related to hollyhocks, the rose of Sharon, okra, and cotton.
Hibiscus Pests Control The Usual Suspects
There was a big outbreak of whiteflies a few years ago which commercial growers experienced.
Control aphids with a natural pest repellent like our favorite Neem Oil or one of the houseplant sprays; red spiders hate high humidity which hibiscus need to thrive, and mealybugs can be wiped out with a spray neem, or by dabbing them with alcohol.
Weekly spraying with tepid water keeps the foliage clean and attractive.
Hibiscus Tree Plant Trivia, Questions & Answers
TRIVIA: Did you know that Hibiscus rosa-sinensis is the national flower of Malaysia?
At one time the famous “Hawaiian lei” was made only of green material until the brilliance of hibiscus bloom impelled the bronze-skinned maids to add color to these tokens of friendship.
Rosa-sinensis have numerous medical uses. It is also grown as an ornamental plant. Women in some countries use it for hair care purposes. Children in the Philippines use it for their bubble-making game.
In fact, George Washington ordered hibiscus from Philadelphia nurseryman John Bartram in 1792. These plants had single, red flowers, similar to the present day variety.
Both the flowers and leaves of the Hibiscus bush can be used to produce a lovely reddish Hibiscus dye. [source]
Question: A hibiscus plant is one of the plants we brought back from our Hawaiian vacation. Can Hibiscus be grown indoors? We also saw small hibiscus trees that were interesting but like the bush type much better. Can hibiscus be grown outdoors in a pot on a patio or deck? Courtney, Nashville, Tennessee
Answer: Hawaii and Hibiscus – picturesque words bringing to mind a vision of sunny skies and hula dancers adorning their dark tresses, exotic blossoms and tropical climate.
Dropping Buds or Blooms?
Question: Why do the flower buds and leaves of my Chinese hibiscus turn yellow and drop off before blooming time? RR, CA
Answer: Perhaps there is something wrong with the location of your hibiscus. It should have good light and a well-drained soil.
The hibiscus (hy-BIS-kus) lends itself beautifully to pot culture, and because there is no dormant season for the potted plant, it may be kept in bloom the year around.
It ranks high in popularity along the Gulf Coast in Florida and Texas and in Southern California as well as a colorful spring time plant for the northern patio.
A Round Up On Caring For Potted Hibiscus
- Hibiscus thrive in the warm weather and lots of sun.
- Avoid setting potted plants outside if the temperatures dip below 50 degrees Fahrenheit or if they exceed 90 degrees Fahrenheit.
- Keep the soil moist but make sure your plant does not sit in water.
- Apply liquid food weekly.
- Prune plants to maintain shape and produce new flower buds.
- Check regularly for pests, use Neem oil for control
If you follow these tips, you should enjoy plenty of gorgeous flowers and a happy healthy plant.