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The Queensland Gardening Pages
Information & resources about plants & gardens for Brisbane & Qld

Gardenia

Gardenia jasminoides and other Gardenia species

Rubiaceae


Gardenias are commonly used landscape plants in SEQld, but too often the dream of fragrant, milky-white blooms fails to match the reality of growing these plants in Queensland's increasingly hot and dry conditions.

Hints for growing gardenias well in SEQLD include a moist but well drained soil enriched with organic matter. They will need plenty of light for flowering but protection from the most punishing summer sun and drying winds. Morning sun or dappled sun all day would be appropriate.

These somewhat fussy shrubs will tend to drop their flower buds if they get stressed, such as a heat or cold shock, or drying out. Try to keep soil moisture consistent.

Fortunately, the common type sold locally as 'Florida' is a garden centre staple in SEQld and don't cost a lot in the smaller pot sizes. Why not buy a few plants and try them out in a different spots to see what works best in your garden?

Alternatively, try one in a tub in an azalea and camelia mix. Gardenias like soil on the acid side. A fertilser designed for other acid-loving plants like azaleas or camellias would also be suitable for gardenias.

Epsom Salts are sometimes recommended as a remedy for yellow leaves, but note that like any plant, a number of nutritional deficiencies/toxicites could cause yellowing of foliage.

Gardenias are prone to Sooty Mould

Prune after flowering. Avoid winter/spring pruning as this will result in loss of the autumn-initiated flower buds which normally bloom in late spring/early summer.

From general observation, the groundcover form 'Radicans" does seem to perform better locally than the larger shrub types. This can also be pruned to form a miniature hedge. So, these are also an alternative to try if you desire gardenia fragrance in the garden, but aren't having luck with other forms.

Most gardenias grown gardens here are cultivars of Gardenia jasminoides (synonyms G augusta, G. florida). However there are other species in cultivation.(Note from the Editor: If anyone knows of a retail supplier of Gardenia taitensis or Gardenia thunbergia in Australia, please get in touch). furthermore, there are plants commonly referred to by the name "Gardenia" which actually belong to other genera, such as the "mock gardenia" or the "native gardenia"


Where to buy Gardenias in Qld

You'll find the most common forms routinely carried by most garden centres.

If you're a nursery specialising in Gardenias, or a company responsible for promoting new Gardenia cultivars, please get in touch for information about advertising your business on this page.


Online Information Resources

The following are for general information, research and ideas. Some species or cultivars referred to in links may be unavailable in Australia. Some pests and diseases and/or control options might not be applicable here.
Common Gardenia University of Hawaii (PDF)
Gardenia jasminoides University of Florida (PDF)
Gardenia jasminoides Missouri Botanical Garden
Gardenia jasminoides AgroForestryTree Database
Gardenias by Joan Bradshaw, University of Florida, USA
Gardenias Are Garden Favorites Arid-Southwestern Gardening Information, University of Arizona
Gardenia Clemson University, South Carolina
Gardenia Royal Horticultural Society, UKGardenia Royal Horticultural Society, UK
Gardenias' Smell Casts Spell Over Gardeners Office of Agricultural Communications Mississippi State University, USA
Growing Gardenias in Florida University of Florida

Problems

Visual Symptoms of Plant Nutrient Deficiencies in Nursery and Landscape Plants (Picture of iron deficiency) University of Hawai'i at Manoa
Establishing a critical level for available iron for gardenias with the modified comber soil test Reproduction of a 1960 article, Proceedings of the Florida State Horticultural Society (PDF)
Growing Gardenias Reproduction of Home and Garden Bulletin 152, USDA, 1968. Revised October 1975. U.S. Department of Agriculture (PDF)
Manganese Deficiency in Gardenia (Gardenia jasminoides) A photograhic illustration. University of Florida NutDef Plant Nutrient Deficiency Database
Missing nutrients cause plant problems Mississippi State University
Ungainly Gardenia Royal New Zealand Institute of Horticulture
Yellowing gardenias Royal New Zealand Institute of Horticulture
Green Coffee Scale in Longan (Hosts include gardenia) Dept of Primary Industries and Fisheries, Queensland
Hawk Moths Australian Museum online
Gardenia Insects & Related Pests Clemson University Cooperative Extension Service, South Carolina
Gardenia spp. Document concentrates on pests and diseases. University of Florida (PDF)

Cultivars

Gardenia jasminoides 'Florida' At "Grow Me Instead" (an Australian website informing gardeners about safer alternatives to invasive ornamentals)
Gardenia jasminoides 'Ocean Pearl' At "Grow Me Instead" (an Australian website informing gardeners about safer alternatives to invasive ornamentals)
Gardenia jasminoides'Radicans' At "Grow Me Instead" (an Australian website informing gardeners about safer alternatives to invasive ornamentals)
Gardenia jasminoides 'Prostrata' University of Florida, USA (PDF)
Gardenia 'Grandiflora Star' At "Grow Me Instead" (an Australian website informing gardeners about safer alternatives to invasive ornamentals)
Gardenia 'Shooting Star' My Virtual Maryland Garden

Propagation and commercial production

Gardenia jasminoides Landscape Plant Propagation Information, University of Florida
Gardenia jasminoides 'Radicans' Landscape Plant Propagation Information, University of Florida
Gardenia jasminoides 'Radicans Variegata' Landscape Plant Propagation Information, University of Florida
Gardenia jasminoides 'Veitchii' Landscape Plant Propagation Information, University of Florida
Gardenia jasminoides Rooting Database, University of California, Davis
Flowering of Gardenias as Affected by Photoperiod, Cycocel and B-9 Reproduction of a 1968 article, Proceedings of the Florida State Horticultural Society (PDF)
Variable photoperiod and CCC effects on growth and flowering of Gardenia jasminoides 'Veitchii' Reproduction of a 1962 article, Proceedings of the Florida State Horticultural Society (PDF)

Other Gardenia species

GRIN Species Records of Gardenia Germplasm Resources Information Network (GRIN)
Gardenia tubifera 'Soleil D'or' At "Grow Me Instead" (an Australian website informing gardeners about safer alternatives to invasive ornamentals)
Rothmannia globosa (syn. Gardenia globosa)
Gardenia volkensii South African National Biodiversity Institute
Tiare Tahitian gardenia. Kauai Community College, Hawaii
Meet the Plants Pacific flora database of the National Tropical Botanical Garden, USA
Night time fragrance for your Miami-Dade garden includes notes on several uncommon Gardenia and Tabernaemontana species. Univ.Florida (PDF)
A revision of Gardenia (Rubiaceae) from northern and north-western Australia Nuytsia (Western Australia's journal of systematic botany)

Related Topics:



Gardenia flower buds
Gardenia buds, (Late October 2012, Sunnybank Hills, Brisbane)

Gardenia flowers
Gardenia flowers, (November 2012, Eight Mile Plains, Brisbane)

Gardenia as a hedge
Gardenia as a hedge in December. Although this is the main flowering season, there are bew blossoms. Prior pruning has removed most of the buds. (December 2012, Sunnybank, Brisbane)

Gardenia unknow cultivar
Gardenia , (November 2012, Sunnybank Hills, Brisbane). Note browning of petals on blossoms on the left, possibly due to thrips

Gardenia unknow cultivar
Here damage restricted to outer petals, (November 2012, Sunnybank Hills, Brisbane).

Gardenia unknow cultivar
Older bloom yellowing with age, with more extensive browning on petal edges, (November 2012, Sunnybank Hills, Brisbane)

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