Gardenia
Gardenia jasminoides
Also called cape jasmine
Gardenia blooms from May through July.
Mature size, hardiness zones, sun and the trait tags were checked against named botanical sources for this plant. The bloom months and water need on this page were not.
Growing Gardenia
Plant it in part sun. It prefers high water. It is hardy in USDA zones 8–11. Expect it to reach about 3.9 ft tall and 3.9 ft wide at maturity, in roughly 4 years.
When to plant Gardenia
Plant Gardenia in early spring as soon as the soil is workable, or in early fall at least six weeks before your first frost, so roots establish in cool weather. For the middle of its hardy zones 8 to 11 range, spring means January to March and fall means October or November. Once settled, it blooms from May to July.
Month-by-month timing for your zone is on the planting calendar: for the middle of its range, start with zone 9 in January.
Comes in 6 varieties
Same plant, same care - pick the variety you are growing.
Good to know about Gardenia
Curated from university extensions, botanic gardens and other primary sources, with the source named on every note.
Safety
Toxic to dogs, cats and horses, but only mildly: eating it typically causes mild vomiting or diarrhea, sometimes hives. The toxins are geniposide and gardenoside. per ASPCA and NC State
Worth knowing
Its make-or-break need is acidic soil (about pH 5.0 to 6.5). Above roughly pH 7.0 iron gets locked up and the young leaves yellow between green veins. per Clemson and University of Florida
When to prune
Clemson and the University of Florida say prune right after the summer flush, never after October 1. NC State says prune in spring, which fits reblooming cultivars. per Clemson and NC State
Buds drop under stress
Unopened buds falling is a classic complaint, triggered by temperature swings, low humidity, over- or under-watering, poor drainage, too little light, or moving the plant. Keep the environment steady. per Clemson
Sap-sucking pests and sooty mold
Whitefly, aphids, scale, mealybugs and thrips suck sap and yellow the leaves. Their sticky honeydew grows black sooty mold, so controlling the insects is what clears the mold. per Clemson
Grafting: nematode fix vs cold
In warm sandy soil, root-knot nematodes gall the roots. Grafting onto Gardenia thunbergia rootstock resists them, but those grafted plants are less cold-hardy than own-root ones. per University of Florida
Intensely fragrant white flowers
Waxy, creamy-white flowers 5 to 10 cm (2 to 4 in) across carry the famous heady scent, single or double, and age to cream or pale yellow. per NC State
What pairs well with Gardenia
Good companions share its growing conditions and add something it lacks: an earlier or later bloom, a lower carpet in front, or structure through winter.
Wishbone Flower
Takes part sun to part shade and moderate to high water; lower at 10 in, for the front of the border; overlaps, then carries the display into early fall; a soft color beside the yellow.
Amaryllis
Shares part sun and moderate to high water; blooms in early spring, before this one opens; lower at 1.6 ft, for the front of the border; a soft color beside the yellow.
Sweet Alyssum
Takes full sun to part sun and moderate to high water; low at 5 in, to carpet the ground beneath; overlaps, then carries the display into mid fall; its white flowers settle the yellow.
Calibrachoa
Takes full sun to part sun and moderate to high water; lower at 8 in, for the front of the border; overlaps, then carries the display into mid fall; a soft color beside the yellow.
Moonflower
Takes full sun to part sun and moderate to high water; overlaps, then carries the display into early fall; climbs to 13 ft behind it, height without the footprint; a soft color beside the yellow.
Dahlia
Takes full sun to part sun and high water; overlaps, then carries the display into mid fall; a soft color beside the yellow.
Canna Lily
Takes full sun to part sun and high water; overlaps, then carries the display into early fall; a soft color beside the yellow.
Cyclamen
Takes part sun to part shade and moderate to high water; blooms in early fall, extending the bed's season; lower at 8 in, for the front of the border; a soft color beside the yellow; they only overlap in zones 8 to 9.
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