Gardenia
Glossy dark leaves and creamy white flowers with one of the most famous scents in the plant world. A demanding houseplant: it wants bright light, cool nights, acidic soil and humidity, and drops buds at the slightest change.
People buy gardenias for the scent, and the scent is worth it. Keeping one indoors is a project. It wants a bright window, nights around sixty degrees, soft acidic water, humidity, and absolutely no surprises; a bud that has set will drop if the plant is moved or the temperature swings.
It is a plant for a cool, bright room and an attentive owner. Where winters are mild it is happier on a patio.
Light
Bright light with several hours of gentle direct sun. An east window is ideal; a south one with the plant a foot back. Not enough light and it will not set buds.
Water
Evenly moist with filtered or rain water, every five days or so in summer and every eight in winter. Tap water alkalinity turns the leaves yellow over time. Never let it dry out, never let it sit wet.
Soil and potting
An acidic, peat-based mix, like one sold for azaleas and camellias. Repot every couple of years in spring, after flowering.
Feeding
An acid-loving plant food at half strength every three weeks in spring and summer. Yellow leaves with green veins mean it needs iron; an acidic feed corrects it.
Propagation
Semi-ripe stem cuttings in early summer with rooting hormone, kept warm and humid. Slow.
In a hot, dry home
Difficult here. Summer heat above the mid-seventies at night stops it flowering, dry air drops the buds, and alkaline tap water yellows it. The best version indoors here is a bright north-east window, a humidifier, rainwater, and low expectations in July and August. Many people here grow it outdoors in a shaded courtyard instead.
Problems and fixes
Buds dropping before opening
Likely cause: A change in temperature, light, water or position
Fix: Keep everything steady once buds form. Do not move it.
Yellow leaves with green veins
Likely cause: Iron deficiency from alkaline water or soil
Fix: Use filtered or rain water and an acid-loving plant feed.
No buds
Likely cause: Not enough light, or nights too warm
Fix: Brighter light and cooler nights, ideally around 60°F.
Sooty black film and sticky leaves
Likely cause: Scale or whitefly
Fix: Wipe leaves, treat with insecticidal soap, repeat weekly.
Gardenia questions
Is gardenia toxic to cats and dogs?
Yes. It causes vomiting, diarrhoea and hives if chewed.
Why are my gardenia buds falling off?
Change. A move, a temperature swing, dry air or a watering lapse after the buds set. Keep conditions steady.
Why are my gardenia leaves turning yellow?
Usually iron deficiency from alkaline tap water. Switch to filtered or rain water and feed with an acid-loving plant food.
Plants with a similar rhythm
African Violet
- Light
- Medium to bright indirect
- Water
- Weekly
- Pets
- Safe
