Shrub · Theaceae
Tea
Camellia sinensis
In acidic soil, dappled shade, and steady moisture, this evergreen shrub unfurls the small tender leaves that become every cup of tea.
Partial shade
Every 5–10 days
USDA 7–9
3–7 ft · 0.9–2 m
Overview
Tea is a single evergreen shrub, Camellia sinensis, its branches clothed in green leaves that hold through winter, the same plant that yields green, black, and oolong. It stands as a close relative of the garden camellia and shares that acid-loving, shade-seeking nature. Left unpruned the stems rise past head height, though most growers keep them cut into a dense, low, leafy hedge.
New growth breaks in soft flushes, each a single upright bud crowned by the top two leaves, pale and tender against the older foliage, and it is these tips that are picked. In fall the shrub opens fragrant white flowers among the evergreen leaves, a pale, scented note on a plant otherwise all foliage.
The leaf itself shifts with the variety: the China type wears smaller leaves, while the Assam type carries broad, large ones. The China type holds its green through light frost and grows outdoors across USDA zones 7 to 9, and a potted plant can shelter indoors where winters run colder. Give it acidic soil and free drainage, and the foliage does the rest over time.
Care
The short version: part shade, acidic well-drained soil kept evenly moist, a seasonal acid feed, and a late-winter prune that keeps the leafy hedge at a pickable height.
Light
Tea holds its color best in part shade, the dappled light beneath taller trees. It takes more sun in cooler climates and copes with full sun where the roots stay moist, but a hot afternoon glare scorches the leaves.
Water
Keep the root zone evenly moist but never waterlogged, roughly every 5 to 10 days and more often through a dry spell or when the plant pushes new leaves. A blanket of mulch keeps that moisture in the soil. Ground left soggy rots the roots.
Soil
This is an acid lover, rooting best in well-drained, organic-rich loam at a pH of 4.5 to 6.5. Dig in plenty of organic matter, and keep it clear of any low spot where water sits.
Temperature
Once established, the shrub holds from about 5°F to 86°F (-15°C to 30°C). The China type keeps its green through light frost, but a hard freeze nips the tender new growth, so shelter young plants or move pots under cover in the coldest spells.
Humidity
Average humidity of 40% to 60% keeps the foliage in good condition, in step with most temperate gardens. Outdoors there is no number to watch, though a plant kept inside holds its leaves better with a little extra moisture in the air.
Feeding
Feed seasonally from spring through summer while the plant is in active growth, using an acidic azalea or camellia fertilizer. It holds the soil in the acidic range the roots need and drives the flush of new leaves you pick.
Pruning
Prune in late winter to early spring to keep the leafy hedge around 90 to 120 cm. Pinching out the young flushes through the season thickens the shrub and, at the same stroke, gathers the very leaves used for tea.
Repotting
A potted plant needs a larger home every 2 to 3 years, or sooner once roots wind around the pot, push out the drainage holes, or let water run straight through. Growth that stalls says the same thing: fresh acidic mix and a bigger pot.
Size & spacing
Grown as a hedge the shrub reaches 3 to 6.5 feet (90 to 200 cm) tall and nearly as broad, with a spread of 3 to 5 feet (90 to 150 cm). Set each plant that far apart so air threads through the foliage and every branch stays within reach for pruning.
When to plant
Tea unfolds slowly, leaf by leaf, so timing follows the long arc of the plant rather than a narrow window. Start seed or cuttings in late winter, set young plants out in spring after frost, and pick the tender leaf flushes from spring through summer. The white flowers open in fall.
Northern hemisphere
Southern hemisphere
Typical months for a temperate climate: start earlier in warm zones, later where spring frosts linger.
- Sow: late winter in a warm propagator
- Plant: spring after the last frost
- Harvest: Fragrant white flowers in fall; harvest young leaf flushes (bud and top two leaves) from spring through summer.
Hardiness
USDA hardiness zones: 7–9
Temperature: down to -18°C
Troubleshooting
The plant writes its troubles on its leaves and roots, and nearly all of them come from soil that has left the acidic range or ground that has stayed too wet, with scale insects a distant third. A close look tells you which. Match the appearance below and act before it spreads across the foliage.
Wilting and dieback in ground that stays wet
Foliage droops and whole branches die back when the roots stand in water that never drains, the signature of root rot, and the plant sinks further after each heavy rain. Lift a little soil and look for roots gone dark and mushy. Once they are far gone the plant will not come back, so pull it, mend the drainage, and replant where water slips straight through.
Fix:
- Improve drainage and stop overwatering
- Remove and discard severely affected plants
- Replant in raised or amended well-drained beds
Leaves yellowing between veins that stay green
The leaf turns yellow while the fine veins stay green, the clear mark of interveinal chlorosis, which follows when the soil goes too alkaline and locks up iron and manganese. Bring the pH down with elemental sulfur or an acidifying feed, then lay pine bark or pine needle mulch to hold it. A dose of chelated iron floods the new leaves back to green while the soil comes around.
Fix:
- Lower soil pH with elemental sulfur or an acidifying fertilizer
- Apply chelated iron for quick correction
- Mulch with pine bark or pine needles
A sticky black film with pale bumps under the leaves
A shiny, sticky film blackens the leaves where tea scale and its kin fasten to the undersides and weep honeydew that sooty mold then coats. Turn a leaf and you find small white or brown bumps clustered near the stem. Wet them with horticultural oil at the label rate, cut away the worst branches, and leave the natural predators to clear the stragglers.
Fix:
- Treat with horticultural oil following label rates
- Prune out heavily infested branches
- Encourage natural predators
Toxicity
The leaves are safe for people and the whole reason for the plant, yet those same green leaves hold the caffeine and theobromine carried in the cup. The compounds are hard on animals, so keep cats, dogs, horses, and other pets away from the foliage, and take even greater care with brewed tea, dried leaves, and used grounds, which concentrate them far more.
Toxic to
Cats · Dogs · Horses · Rabbits · Livestock · Birds
Safe for
People
Cats Caution
Those green leaves hold the same caffeine and theobromine as the cup, and cats take both hard. A single nibble may pass, but a fuller mouthful can bring vomiting, restlessness, a racing heart, and tremors.
Dogs Caution
Chewed leaves feed a dog caffeine and theobromine, the same stimulants that make chocolate dangerous. After a larger helping, look for vomiting, hyperactivity, a fast heartbeat, and shaking.
Horses Caution
Horses take caffeine badly, so keep them off the hedge. A mouthful of leaves can leave one jittery, its pulse quickened and its muscles trembling.
Rabbits Caution
The methylxanthines that strike cats and dogs strike rabbits as well, and a small body needs only a trace to feel them. Keep the leaves out of reach and spare the racing heart and the jitters.
Livestock Caution
Cattle, goats, and sheep should never browse the foliage, where the caffeine can turn the gut over and race the heart. A fence between them and the shrubs settles it.
Birds Caution
Birds meet caffeine hardest of all, and even a scrap of leaf can overstimulate a small body. Keep pet birds clear of the plant and of any tea left within reach.
People Leaves safe
For people this is the plant behind the daily cup, its leaves picked, processed, and steeped without harm. The caffeine here is the reward, not the risk.
Keep brewed tea, dried tea leaves, and used grounds well out of reach of pets, as these are the most concentrated and dangerous forms.
Helpline numbers
United States
ASPCA Animal Poison Control: (888) 426-4435 (fee applies)
United Kingdom
Animal PoisonLine: 01202 509000 (fee applies)
Australia
Animal Poisons Helpline: 1300 869 738
Varieties
Almost all tea comes from two varieties of the one species, set apart mostly by the size of their leaves, along with a few selections bred for cold. These are the ones worth knowing.
var. sinensis
The China type is the hardier one, its leaves smaller and neat, and it stands up to cooler climates while giving both green and black teas.
var. assamica
The Assam type carries broad, large leaves, comes from warm tropical country, and goes mostly into black tea.
'Sochi'
'Sochi' is a cold-hardy Russian selection reached for when tea is grown in a temperate garden.
Companions
Tea grows best among the other acid-loving shrubs that want the same soil and the same dappled light.
Plant near
Azalea: Shares the same acidic, well-drained soil and part-shade preferences.
Camellia japonica: Same Theaceae cultural needs for acidic soil and dappled shade.
Rhododendron: Acid-loving understory shrub with matching light and moisture requirements.
How to propagate
Tea grows from cuttings or from seed, and neither is quick. Both take years to build a plant large enough to pick from, and cuttings copy the parent leaf for leaf.
Stem cuttingsModerate
Late summer from semi-hardwood growth · Several months to root, then 2-3 years to harvestable size
Cuttings copy the parent leaf for leaf, which makes them the dependable route. Take semi-hardwood pieces in late summer, dip the cut ends in rooting hormone, and hold them in a warm, humid medium. Roots form over several months, and the young plant needs 2 to 3 years to build enough leaf to pick.
SeedModerate
Sow fresh seed in late winter to spring · Germinates in weeks; plants take about 3 years before leaf harvest
Seed grows too, but each seedling comes out its own way. Soak fresh seed and sow it from late winter into spring, and green shoots break the surface within weeks. Because the seedlings vary, most growers keep to cuttings for matched clones, and either way the first leaf harvest waits about 3 years.
Myths
Green tea and black tea come from different plants.
Both come off the same shrub, Camellia sinensis, from the very same green leaves. The difference is all in the processing, black tea oxidized fully and green tea barely oxidized at all.
The tea plant is strictly tropical and cannot survive frost.
Tea is an evergreen shrub hardy to about USDA zone 7 that keeps its leaves and takes light frost once established. The broad-leaved Assam type does want warmth, but the smaller-leaved China type and selections like 'Sochi' grow well in a temperate garden.