Gardenia jasminoides ‘Kleim’s Hardy’

  • Attributes: Genus: Gardenia Species: jasminoides Family: Rubiaceae Life Cycle: Perennial Woody Recommended Propagation Strategy: Seed Stem Cutting Country Or Region Of Origin: species is native to China, Japan, Taiwan, & Vietnam Wildlife Value: Gardenia hips attract birds and other wildlife. Play Value: Attractive Flowers Fragrance Wildlife Food Source Dimensions: Height: 2 ft. 0 in. – 3 ft. 0 in. Width: 2 ft. 0 in. – 3 ft. 0 in.
  • Whole Plant Traits: Plant Type: Shrub Leaf Characteristics: Broadleaf Evergreen Habit/Form: Mounding Rounded Growth Rate: Slow Maintenance: High
  • Cultural Conditions: Light: Full sun (6 or more hours of direct sunlight a day) Partial Shade (Direct sunlight only part of the day, 2-6 hours) Soil Texture: Clay High Organic Matter Loam (Silt) Sand Soil pH: Acid (<6.0) Soil Drainage: Good Drainage Moist Available Space To Plant: 3 feet-6 feet NC Region: Coastal Mountains Piedmont Usda Plant Hardiness Zone: 7a, 7b, 8a, 8b, 9a, 9b, 10a, 10b, 11a, 11b
  • Fruit: Fruit Color: Orange Fruit Type: Berry Fruit Length: 1-3 inches Fruit Width: < 1 inch
  • Flowers: Flower Color: Gold/Yellow White Flower Inflorescence: Head Flower Value To Gardener: Fragrant Good Cut Flower Bloom Time: Spring Summer Flower Shape: Star Flower Petals: 6 petals/rays Flower Description: Single star-like ivory flowers that are up to 2 inches across with bright golden stamens
  • Leaves: Leaf Characteristics: Broadleaf Evergreen Leaf Color: Green Leaf Feel: Glossy Leathery Leaf Type: Simple Leaf Arrangement: Opposite Whorled Leaf Shape: Lanceolate Leaf Margin: Entire Hairs Present: No
  • Stem: Stem Is Aromatic: No
  • Landscape: Landscape Location: Container Patio Small Space Walkways Landscape Theme: Asian Garden Children’s Garden Cutting Garden Garden for the Blind Nighttime Garden Design Feature: Border Specimen Attracts: Bees Songbirds Resistance To Challenges: Deer Problems: Frequent Disease Problems Frequent Insect Problems

Gardenia jasminoides ‘Kleim’s Hardy’ (Gardenia ‘Kleim’s Hardy’)

Botanical name

Gardenia jasminoides ‘Kleim’s Hardy’

Other names

Gardenia ‘Kleim’s Hardy’


Gardenia Gardenia

Variety or Cultivar

‘Kleim’s Hardy’ _ ‘Kleim’s Hardy’ is a dwarf, low mounded, evergreen shrub that has dark green foliage and star shaped, single white flowers with an intense fragrance appearing most profusely in early summer and then sporadically through the season.




The flowers are heavily scented.


Bushy, Clump-forming, Spreading

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White in Summer

Dark-green in All seasons

How to care

Watch out for

Specific pests

Glasshouse whitefly , Mealybugs

Specific diseases

Grey mould

General care

Propagation methods

Seed, Semi-hardwood cuttings

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Where to grow

Gardenia jasminoides ‘Kleim’s Hardy’ (Gardenia ‘Kleim’s Hardy’) will reach a height of 1m and a spread of 1m after 5-10 years.

Suggested uses

Containers, Greenhouse, Indoor, Sub-Tropical


Plant outdoors in well-drained humus-rich. Choose a frost-free, sheltered spot in partial shade. Or grow under glass in a lime-free soil in bright (but filtered) light in moderate humidity.

Soil type

Clay, Loamy, Sandy

Soil drainage

Well-drained, Moist but well-drained

Soil pH

Acid, Neutral


Partial Shade, Full Sun


South, East, West



UK hardiness Note: We are working to update our ratings. Thanks for your patience.

Indoor unheated (H2), Tender in frost (H3)

USDA zones

Zone 9, Zone 8, Zone 7

Defra’s Risk register #1

Plant name

Gardenia jasminoides ‘Kleim’s Hardy’ (Gardenia ‘Kleim’s Hardy’)

Common pest name

Lance nematode; Nematode; Lance

Scientific pest name

Hoplolaimus spp.



Current status in UK


Likelihood to spread to UK (1 is very low – 5 is very high)

Impact (1 is very low – 5 is very high)

General biosecurity comments

Nematode species potentially affecting a wide variety of crops; prohibition of soil likely to mitigate risk substantially; keep under review in light of interceptions or findings should they occur in the EU.

About this section

Our plants are under greater threat than ever before. There is increasing movement of plants and other material traded from an increasing variety of sources. This increases the chances of exotic pests arriving with imported goods and travellers, as well as by natural means. Shoot is working with Defra to help members to do their part in preventing the introduction and spread of invasive risks.

Traveling or importing plants? Please read “Don’t risk it” advice here

Suspected outbreak?

Date updated: 7th March 2019 For more information visit:

Gardenia, Cape Jasmine, Gandharaj ‘Kleim’s Hardy’

View this plant in a garden



Tropicals and Tender Perennials

Water Requirements:

Average Water Needs; Water regularly; do not overwater

Sun Exposure:

Sun to Partial Shade



Foliage Color:

Unknown – Tell us


6-8 ft. (1.8-2.4 m)


6-8 ft. (1.8-2.4 m)


USDA Zone 8b: to -9.4 °C (15 °F)

USDA Zone 9a: to -6.6 °C (20 °F)

USDA Zone 9b: to -3.8 °C (25 °F)

USDA Zone 10a: to -1.1 °C (30 °F)

USDA Zone 10b: to 1.7 °C (35 °F)

USDA Zone 11: above 4.5 °C (40 °F)

Where to Grow:

Unknown – Tell us



Bloom Color:

White/Near White


Bloom Characteristics:

Flowers are good for cutting

Flowers are fragrant

Bloom Size:

Unknown – Tell us

Bloom Time:

Late Spring/Early Summer

Mid Summer

Other details:

Unknown – Tell us

Soil pH requirements:

5.6 to 6.0 (acidic)

Patent Information:

Unknown – Tell us

Propagation Methods:

From softwood cuttings

By simple layering

Seed Collecting:

Unknown – Tell us


This plant has been said to grow in the following regions:

Anniston, Alabama

Little Rock, Arkansas

Carlsbad, California

Hesperia, California

San Anselmo, California

Denver, Colorado

Lewes, Delaware

Wilmington, Delaware

Washington, District of Columbia

Crestview, Florida

Navarre, Florida

Carrollton, Georgia

Marietta, Georgia(2 reports)

Winterville, Georgia

Wrightstown, New Jersey

Elizabeth City, North Carolina

Hillsborough, North Carolina

Raleigh, North Carolina

Wilmington, North Carolina

Winston Salem, North Carolina

Lake Oswego, Oregon

Conway, South Carolina

Prosperity, South Carolina

Germantown, Tennessee

Middleton, Tennessee

Houston, Texas

San Antonio, Texas

Richmond, Virginia

Stafford, Virginia

Bremerton, Washington

Vancouver, Washington

Walla Walla, Washington

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Gardenia Winter Care – Tips For Wintering Over Gardenia Plants

Gardenias are grown for their large, sweetly fragrant flowers and glossy evergreen foliage. They are meant for warm climates and sustain substantial damage when exposed to temperatures below 15 F. (-9 C.). Most cultivars are hardy only in USDA plant hardiness zones 8 and warmer, but there are some cultivars, labeled as cold-hardy, that can withstand winters in zones 6b and 7.

How to Winterize Gardenia Outside

Be ready for unexpected cold snaps by keeping supplies on hand to protect your plant. On the fringes of the recommended climate zones, you can protect gardenias in winter by covering them with a blanket or cardboard box during brief cold snaps.

A cardboard box large enough to cover the shrub without bending the branches is a must when temperatures drop. Gardenia winter care in areas that experience snow includes protecting the branches from the weight of heavy snow accumulation. Cover the plant with a cardboard box to prevent the weight of the snow from breaking the branches. Have old blankets or straw available to insulate the shrub under the box for an extra layer of protection.

Outdoor container grown plants can be overwintered in a sheltered location and insulated with bubble wrap in areas just outside their growing zone, or one zone lower. For colder areas, however, these should be brought inside (see care below).

Despite your best efforts, the tips of the branches may die and turn black from frost or cold damage. When this happens, prune the branches a couple of inches below the damage with sharp pruning shears. If possible, wait until after it blooms.

Indoor Winter Care for Gardenias

In colder areas, plant gardenias in containers and provide winter care for gardenias indoors. Clean the plant with a strong spray from a water hose and thoroughly examine the foliage for insect pests before bringing it indoors. When wintering over gardenia plants indoors, keep in mind that these are evergreen shrubs that don’t go dormant in winter, so you will need to continue to provide optimal growing conditions.

A gardenia kept indoors over winter needs a location near a sunny window where it can receive at least four hours of direct sunlight each day.

Indoor air is dry in winter, so you will have to provide extra humidity for the plant during the winter months. Place the plant on top of a tray of pebbles and water or run a small humidifier nearby. Although you should mist the plant occasionally, misting alone doesn’t provide enough humidity for good health.

Gardenias overwintered indoors need cool night temperatures of around 60 F. (16 C.). The shrub will survive warmer night temperatures but it may not flower well when you take it back outdoors.

Keep the soil lightly moist and use a slow-release azalea fertilizer according to the package instructions.

Gardenias can survive cold winter in southern New Jersey with a little care

I love gardenias. Whenever I pass the hardy gardenia plants in the nursery, I have to stop to smell them. They are truly one of my favorite scents. I have a beautiful bloom on my kitchen table right now.

I had these fragrant, romantic flowers in my August wedding bouquet almost 50 years ago. When I stop to sniff the gardenia plants in the nursery, I often pick a few to add to the wedding bouquets or arrangements that I am making for customers. Most people do not realize that these hardy gardenias can be planted outside year round and they will bloom all summer. There are hardy and there are tender gardenias. The hardy will grow outside all year long and the tender must be taken inside. You can plant some hardy ones now so they will establish prior to winter.

Some winters, I have tender gardenia in my sunny bay window. We take them inside and they bloom for a while, but as the days get long, cold and dark, they often do not bloom much until the longer days of spring begin after Valentine’s Day. They love sun and do not mind being cool at night. They especially want to have long drinks of water with plant food in it all summer and again in spring as the days get longer. I also have a spoon or so of time-release osmocote plant food in each pot or around plants outdoors each spring. This is a plant, like azalea, that will benefit when you dump your coffee grounds all around it.

In reading about gardenia, I found that they are related to the coffee plant. They are shiny evergreens and most grow in tropical places. There are a few, however, that will make it through the winter here in our USDA Zone 7 if they are planted in a somewhat protected site close to a wall and out of the wind. I have been reading a lot of online forums and discussion groups to see just how far north they have been grown outside and just what varieties do well. Many folks love their success with growing hardy gardenia outside all year long. With a somewhat protected site up along a house foundation, they seem to do well here in southern New Jersey.

Our son Joe has planted several outside. He seems to think that a good summer with adequate food and water, as well as a rich soil with a lot of humus in it and a site that is somewhat protected, will ensure success.

Sometimes a corner location with good morning sun that is protected by two walls helps these hardy perennials to survive a winter. Raking lots of leaves to almost cover the plant can also work wonders for winter protection. Last winter was cold for so long that some plants were damaged, but according to Joe, leave them in the ground and they often come back. He has some now sending up shoots. I just planted one along my walkway to the front door.

You, too, can plant a hardy gardenia, but try to do so soon so they can establish good roots long before winter. Since they like acidic soil, I will mulch each with chopped leaves in fall. That will also help moderate the soil for winter. Because we have sandy soil, I have to be sure to never allow the gardenia to dry out.

In summary, hardy gardenias should be planted in well-conditioned soil containing compost. Avoid cultivating around the plants, because that may damage their shallow roots. Mulch the plant with triple-shredded root mulch or chopped leaves to keep the soil moist, cool and weed-free. Feed the plants in spring with a time-release such as osmocote. Do not feed after July, as that might produce tender growth that will not be hardy in winter temperature. If the plant looks pale, yellowish-green, however, feed it now. I like a mild does of plant nutrient to restore plants to good health.

They seem to bloom best with moderate temperatures that drop down a bit in the evening. The ideal blooming temperature range is 65 to 85 degrees during the day and 60 to 65 degrees at night. Plants can be pruned as they finish a blooming cycle. If you want your plant to become bushier, pinch out the tips. Pinching will usually promote a heavier bloom the following year.

Although there are said to be several hardy gardenia, here are a few that have made it through the winter for us when planted in a protected area: Gardenia Frostprof, Gardenia Daisy, Gardenia Chuck Hayes and Gardenia Variegata. All can also be grown in a large urn or pot out on a deck and then kept in a bright, sunny garage or unheated porch or cool greenhouse over the winter. I like gardenia so much that I always try to have several in sunny windows. Email garden questions to [email protected]

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