Are Camellias and Gardenias Related?
Yes, camellias and gardenias are related, but only at a very broad level. Both belong to the same plant order called Ericales, yet they come from different families: camellias are in the tea family (Theaceae) and gardenias are in the coffee family (Rubiaceae). While they share a love for acidic soil and similar growing conditions, their flowers, fragrance, and care needs are quite distinct.
What exactly are camellias?
Camellias are evergreen shrubs or small trees native to eastern and southern Asia. They are famous for their showy, rose-like flowers that bloom from fall through spring, depending on the variety. The leaves are glossy, dark green, and somewhat leathery. Camellias belong to the genus Camellia, which includes the tea plant (Camellia sinensis).
Common types include:
- Camellia japonica – large flowers, late winter to spring bloom
- Camellia sasanqua – smaller, often more fragrant flowers, fall bloom
- Camellia reticulata – huge blooms, mild fragrance
Camellias are prized for their ornamental beauty and are often used as foundation plants, hedges, or specimen shrubs in gardens. They prefer partial shade and well-draining, acidic soil.
What exactly are gardenias?
Gardenias are evergreen shrubs or small trees originally from tropical and subtropical regions of Africa, Asia, and the Pacific Islands. They are cherished for their intensely fragrant, creamy white flowers that appear from late spring through summer. The leaves are glossy, deep green, and often have a lighter underside.
Gardenias belong to the genus Gardenia, and the most popular species is Gardenia jasminoides, often called cape jasmine. Their fragrance is unmistakable – sweet, heavy, and often described as jasmine-like. Gardenias are more demanding than camellias when it comes to care, needing consistent moisture, high humidity, and warmth.
Are camellias and gardenias in the same plant family?
No, they are not in the same family. Botanists classify plants into a hierarchy: order, family, genus, species.
- Order: Both belong to Ericales, a large group that includes rhododendrons, blueberries, and persimmons.
- Family: Camellias are in Theaceae (the tea family). Gardenias are in Rubiaceae (the coffee family, which also includes quinine and some other ornamentals).
So they are distant cousins – related at the order level, but not close enough to share a family or genus. They do share a love for acidic soil and similar lighting preferences, which is why gardeners often plant them together.
What are the key differences between camellias and gardenias?
Here’s a simple table to highlight the main differences at a glance:
| Feature | Camellia | Gardenia |
|---|---|---|
| Family | Theaceae (tea) | Rubiaceae (coffee) |
| Flower shape | Rose-like, many petals | Trumpet-shaped, single or double |
| Flower color | White, pink, red, rarely yellow | White to pale cream |
| Fragrance | Mild or none (some sasanqua are fragrant) | Very strong, sweet jasmine scent |
| Bloom time | Fall to early spring | Late spring to summer |
| Leaf size/shape | Oval, serrated edges, glossy | Oblong, smooth edges, leathery |
| Hardiness | Zones 6–9 (some to zone 5) | Zones 8–11 (usually tender) |
| Care difficulty | Moderate | High (needs humidity, consistent moisture) |
Camellias are generally more cold-hardy and more forgiving of neglect. Gardenias can be finicky, especially in dry climates or low-humidity homes.
Do camellias and gardenias need the same care?
They share many care requirements, which is why they can be planted in similar spots. Both need:
- Acidic soil (pH 5.0–6.5). Use an acidifying fertilizer or soil amendment if needed. Espoma Soil Acidifier works well for both.
- Partial shade – morning sun with afternoon shade is ideal. Too much direct sun can scorch leaves and flowers.
- Well-draining, rich organic soil – add compost or peat moss at planting time.
- Consistent moisture – they do not tolerate drought well. Mulch around the base to retain moisture and keep roots cool.
However, gardenias demand more attentive watering – they are sensitive to drying out and also to waterlogged roots. Camellias are more tolerant of short dry spells. Gardenias also need higher humidity; if grown indoors, use a humidifier or pebble tray.
For pruning, both bloom on old wood, so trim right after flowering ends. Use sharp, clean tools like Fiskars Pruning Shears to avoid tearing stems.
Which one is easier to grow?
For most home gardeners, camellias are easier to grow than gardenias. Here’s why:
- Camellias are more cold-hardy, thriving in zones 6–9, while gardenias usually need zones 8–11 or indoor care.
- Camellias are less prone to pests like whiteflies, scale, and mealybugs, which often plague gardenias.
- Camellias tolerate a wider range of light, from full shade to dappled sun. Gardenias need just the right balance of light and shade to bloom well.
- Camellias require less frequent watering once established. Gardenias can suffer quickly from under- or over-watering.
If you're a beginner or live in a cooler climate, start with camellias. If you're in a warm, humid region or are willing to provide extra care, gardenias reward you with that heavenly fragrance.
Can you plant camellias and gardenias together?
Yes, you absolutely can! Because both need acidic soil, partial shade, and similar moisture, they make wonderful companions in the garden. Planting them together can provide seasonal interest: camellias bloom in fall to spring, while gardenias flower in late spring through summer, giving you color and scent across many months.
Things to keep in mind:
- Give each plant enough space – camellias can grow large (6–15 feet), gardenias usually stay more compact (3–6 feet).
- Place gardenias where you can enjoy their fragrance, like near a patio or window.
- Avoid planting under a dense tree canopy where gardenias might not get enough light.
- Use a balanced, slow-release fertilizer formulated for acid-loving plants. Dr. Earth Acid Lovers Fertilizer is a good choice for both.
By pairing them, you create a low-maintenance, fragrant, and beautiful corner in your landscape that’s alive with flowers for half the year or more.
How to tell a camellia from a gardenia at a glance
Use this quick checklist the next time you’re at a nursery or looking at a neighbor’s shrub:
Once you know these signs, you’ll never confuse them again. Both are beautiful, but their differences are clear once you look closely.
To keep both plants healthy, monitor soil moisture with a reliable tool. A moisture meter can prevent overwatering, especially for gardenias. Gardenias also benefit from a light application of Epsom salts (magnesium sulfate) once a month during growing season to boost leaf greenness.