Shrub · Theaceae
Tea Plant
Camellia sinensis
Glossy leaves and small white flowers: with acidic soil, part shade, and steady moisture, Camellia sinensis grows the leaves behind every cup of tea.
Partial shade
Every 3–7 days
USDA 6–9
6–15 ft · 1.8–4.6 m
Overview
Camellia sinensis is the shrub every cup of tea starts with, and up close it reads as a dense, deep-green evergreen from the camellia family. The leaves are glossy and catch the light, and small fragrant white flowers open against them in fall and hold into early winter. Left unpruned the shrub thickens toward the height of a small tree, though many growers keep it low and bushy.
It roots into acidic, organically rich soil and settles into part shade, taking more sun where the ground stays moist around it. Hardiness runs from zone 6 to zone 9 depending on the type, so a well-chosen variety holds its evergreen foliage through real winter cold. The growth is slow, each season adding only a little to the dense frame, and a few years of patience build the plant up.
The harvest is the point, and it is the newest growth that goes into the cup. The pale, tender young leaves and buds are picked in spring and processed at home into green, white, oolong, or black tea, all from the same shrub depending on how the leaf is handled. Kept in acidic, evenly moist soil, a single plant keeps pushing fresh leaves for decades.
Care
The short version: part shade, acidic and organically rich soil kept evenly moist, a light spring feed with an acid-forming fertilizer, and a yearly prune to keep the tender new leaves coming.
Light
Tea plants do best in part shade, which mimics the dappled light of their forest origins and keeps the glossy leaves a deep, even green. They tolerate part to full sun where the soil stays reliably moist, but harsh, dry sun stresses the leaves and the buds.
Water
Keep the soil evenly moist but never waterlogged, since soggy roots invite rot. A 2 to 3 inch mulch holds moisture between waterings, and a dry summer spell is what makes the flower buds drop before they can open, so do not let it run thirsty in the heat.
Soil
This is an acid lover that needs organically rich, well-drained loam with a pH of 5.0 to 6.0. Work in plenty of organic matter, and watch the leaves, since yellowing foliage is the sign the ground has crept too alkaline.
Temperature
The plant is tough across a wide range, taking temperatures from 0°F to 100°F (-18°C to 38°C) once established. The hardier small-leaved Chinese type handles the cold end better than the larger-leaved, tender Assam type.
Humidity
Ordinary outdoor humidity suits it, so there is no target to hit. Airflow matters more, since still, damp air around the crowded glossy leaves is what helps scale and flower blight take hold on them.
Feeding
A light spring feeding with an acid-forming azalea or camellia fertilizer carries this slow shrub through the year. A single seasonal dose suits its unhurried pace, and a soil test is what confirms whether the roots want any more.
Pruning
Prune after flowering to shape the shrub, and for a steady leaf harvest cut it back to 4 to 5 feet just before spring growth to push the fresh, pale shoots. Hard cutbacks are safe from late winter into early May.
Repotting
Grown in a pot, the shrub wants a larger home about every 3 years. The signs are visible: pale roots winding around the rootball or poking through the drainage holes, growth that has stalled, or a plant that has plainly filled its container.
Size & spacing
Left to grow, the dense shrub reaches 6 to 15 feet (1.8 to 4.5 m) tall and spreads 4 to 8 feet (122 to 244 cm) wide, though most growers keep it well below that for easier picking. Give it room to match the size you intend to maintain.
When to plant
The plant moves on a slow clock you can watch on the shrub itself. Young plants go out in spring or fall in mild climates, the small white flowers open from fall into early winter, and the fresh young leaves and buds are picked in early spring as new growth flushes pale at the tips.
Northern hemisphere
Southern hemisphere
Typical months for a temperate climate: start earlier in warm zones, later where spring frosts linger.
- Plant: spring or fall in mild climates
- Harvest: fragrant white flowers fall to early winter; young leaves and buds harvested for tea beginning in early spring
Hardiness
USDA hardiness zones: 6–9
Temperature: down to -23°C
Troubleshooting
Most tea plant trouble writes itself across the leaves, the flowers, or the roots, and the cool, moist conditions camellias enjoy are the same ones that favor pests and fungus. The early marks below show on the plant before a problem spreads through the shrub, so learn to read them.
Entire shrub goes yellow, then droops and stalls
A shrub that yellows all over and slides into wilting decline after a wet spell points to Phytophthora root rot. Dig down and the roots tell it: they turn red-brown to dark brown instead of the healthy white. There is no cure once it sets in, so pull badly hit plants, fix the drainage with raised beds, and protect the rest with a mefenoxam drench.
Fix:
- Improve drainage and avoid waterlogged sites; use raised beds
- Remove severely affected plants since fungicides will not cure established infection
- Apply mefenoxam preventatively to protect remaining healthy plants
Yellow blotches on top, a cottony crust beneath
Yellow splotches across the upper leaf surface mark tea scale, an armored sap-sucker that settles on the underside. Turn a leaf over and the cause shows plainly: dark brown females and smaller white males packed into a cottony white mat. Scrape or prune off the lightly marked leaves, then treat with horticultural oil in late winter and insecticidal soap once the crawlers are moving.
Fix:
- Hand-scrape or prune out lightly infested leaves
- Apply 2% horticultural oil in late winter to early spring
- Use insecticidal soap during crawler activity
- Apply systemic dinotefuran or contact acephate/bifenthrin for heavy infestations
Brown spots that swallow a whole bloom
Small brown spots that spread to brown an entire flower in 24 to 48 hours are camellia petal blight, a fungus rather than cold injury. Dark veins running through the browned petals are the visible tell that sets it apart from a simple chill. Pick off and destroy every infected flower, rake up the fallen ones, and refresh the mulch so the fungus has nowhere to overwinter.
Fix:
- Promptly remove and destroy all infected flowers
- Rake up fallen blooms and debris and replace surface mulch
- Apply mancozeb sprays or soil drenches in late December through January where blight is established
Leaves yellow between green veins
When the leaf tissue yellows but the veins stay sharply green, the plant shows chlorosis, almost always because the soil has drifted too alkaline for this acid lover to pull up iron, and sometimes from a magnesium shortage. A soil test names the cause. Bring the pH back down and apply iron chelate, saving Epsom salt for a confirmed magnesium gap.
Fix:
- Lower soil pH toward acidic range for this acid-loving plant
- Apply iron chelate to correct iron-related chlorosis
- Apply Epsom salt solution (1 tablespoon per gallon) if magnesium deficiency is confirmed by soil test
Toxicity
This is the plant tea comes from, and the picked leaves are safe and good for people. The catch is the caffeine the foliage carries. A fair amount of the fresh leaves can mildly upset cats, dogs, and horses, and brewed tea, tea bags, and dried leaves are far more dangerous to pets than the living shrub. Keep all of those out of an animal's reach.
Toxic to
Cats · Dogs · Horses · Rabbits · Livestock · Birds
Safe for
People
Cats Mild
Caffeine sits in the fresh green leaves, so a cat that grazes on several may turn restless, drool, or suffer a queasy stomach. The steeped tea and the bags hold far more of it, so those belong well out of a cat's reach.
Dogs Mild
Chewing more than one or two leaves, a dog can grow jittery, start panting, and bring its meal back up, all from the caffeine. The dried leaves and a stray mug of cold tea carry the strongest dose, so sweep them out of the way.
Horses Mild
Grazing on a quantity of the leaves can leave a horse wound up and off its feed because of the caffeine. Most horses leave the bitter shrub alone, but it is worth fencing off from a bored one.
Rabbits Caution
There is no clear safety record for rabbits eating tea leaves, and the caffeine gives no reason to risk it. Keep the plant and any dried leaves away from them.
Livestock Caution
Cattle, goats, and sheep tend to walk past the bitter leaves, though a hungry one that eats its fill could feel the buzz of the caffeine. Where stock graze nearby, fence the shrub off.
Birds Caution
A bird's small body reacts sharply to caffeine, so the leaves stay off limits and brewed tea even more so. For any pet bird, treat the whole shrub as out of bounds.
People Safe
This shrub is the source of every brewed cup of tea. Its tender new leaves and the buds get picked, dried, and steeped for people without any harm at all.
The plant itself is non-toxic, but the harvested, dried/processed tea leaves and brewed tea contain caffeine and theobromine (methylxanthines) which are toxic to pets in quantity; do not let pets consume brewed tea, tea bags, or large amounts of dried leaves.
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
Tea splits into two main types of plant, set apart by leaf size, and which one you grow decides both how much cold it takes and what kind of tea its leaves are best for.
Camellia sinensis var. sinensis
The small-leaved Chinese type is the cold-hardy one, holding into USDA zone 6, and its tender young leaves and buds make green and white tea.
Camellia sinensis var. assamica
The large-leaved Assam type from northern India is the more tender, suited to zone 7 and south, and its older, broader leaves go into oolong and black tea.
How to propagate
A tea plant grows from cuttings or from seed, and the two paths trade speed for certainty in opposite directions.
Stem cuttingsModerate
Summer, using semi-hardwood new growth · Several weeks to months to root
Cuttings give you an exact copy of a plant you like. Take semi-hardwood pieces of the current season's growth in summer, firm wood with the year's new leaves, and root them under humid cover, where they settle in over several weeks to a few months.
SeedModerate
Sow fresh ripe seed in fall · Slow; seedlings take about 4 years to begin flowering
Growing from seed is both the slowest path and the least certain, since every seedling turns out a little different from its parent. Sow the plump seed fresh and ripe in fall, then wait, since a young seedling needs about 4 years before it opens its first flowers.
Myths
Those glossy garden camellias and the tea plant are one and the same shrub.
They share a genus but not a species. Camellia sinensis is grown for the leaves you brew and carries smaller fall flowers, while C. japonica and C. sasanqua are planted for their big ornamental blooms. The garden camellias are not where tea comes from, and the smaller bloom on this species is one way to tell them apart.