Every autumn the same plant stops people in their tracks: a row of papery orange lanterns strung along a stiff stem, glowing like paper decorations left out after a party. That is the Chinese lantern, Physalis alkekengi — reclassified in recent years as Alkekengi officinarum, though almost every seed packet still uses the old name. It is a tough, fully hardy perennial that dies back to nothing each winter and returns every spring, and it is grown for one thing above all: those inflated orange calyces, which cut and dry better than almost any other garden plant. This is the complete guide to growing Chinese lanterns from seed — when to sow, how to break their dormancy, how to stop them taking over the border, and how to cut and dry the lanterns for autumn arrangements.
- Botanical name Physalis alkekengi (syn. Alkekengi officinarum) — hardy herbaceous perennial
- Sow February–April indoors after chilling; May–July direct outdoors
- Lanterns green from July, turning orange August–October on 60–75 cm stems
- Position full sun or light shade, any reasonable soil — spreads by runners
Why grow Chinese lanterns
The flowers themselves are a footnote: small, creamy-white and easy to miss in July. The show comes afterwards. Once pollinated, the calyx behind each flower keeps growing, inflating into a hollow papery case around the developing berry. Through August it swells and ripens from green to lime, then to the famous scorched orange, and by October a single stem can carry eight or ten lanterns in a neat vertical row.
They are also genuinely easy. Chinese lanterns are hardy to around −20 °C, untroubled by wind, indifferent to soil type, and once established they need almost nothing from you. Cut in autumn they dry stiff and hold their colour for years, which makes them a backbone plant for anyone growing their own dried flowers. If this is your first perennial from seed, our complete guide to growing flowers from seed covers the groundwork behind everything below.
When to sow Chinese lanterns
Chinese lantern seed carries a cold dormancy: in the wild the berries fall, rot over winter and germinate in spring. Reproduce that and germination is straightforward; skip it and trays sit blank for weeks. The simplest route is to sow indoors from February to April after two to four weeks of chilling, then plant out after the last frost. You can also sow direct outdoors from May to July into warm soil, or scatter seed in autumn and let the winter do the chilling for you.
One thing to be honest about: a spring sowing usually gives leafy plants in year one and a proper crop of lanterns in year two. That is normal for a perennial and worth the wait. Reading this in late summer? The sowing window has passed for this year, but August and September are exactly when established plants colour up and get cut — and there is still plenty that can go in the ground now, as our guide to what to sow in August sets out.
How to sow Chinese lanterns, step by step
- Chill the seed first Mix the seed with barely damp compost or vermiculite in a labelled bag and refrigerate for two to four weeks. This cold-moist period breaks dormancy and makes emergence far more even — the principle behind it is explained in our germination guide.
- Sow shallowly and warm Sow into modules or trays of moist seed compost, covering with only 3–5 mm of fine compost or vermiculite. Hold at 18–22 °C. See our indoor seed starting guide for the kit.
- Be patient Expect 14–28 days, sometimes longer, and expect it in waves. Keep just moist, water from below and ventilate daily to avoid damping off. If nothing appears at all, work through our germination troubleshooting guide.
- Pot on and harden off Move seedlings to 9 cm pots at the four-leaf stage, then harden off for a week before planting out 45–60 cm apart once frosts have finished.
- Or sow direct from May Rake a sunny bed to a fine tilth following our soil preparation guide, sow thinly 5 mm deep and thin to 45 cm. Our direct sowing guide covers the method.
Chinese lantern, cape gooseberry or tomatillo?
Three garden plants share the genus Physalis and the same lantern-shaped husk, but only two of them are for eating. It is worth being clear which is which before you sow.
Chinese lantern (P. alkekengi)
Ornamental only — grown for the papery orange husk, not the fruit.
- Hardy perennial, 60–75 cm, spreads by underground runners
- Bright orange lanterns from August to the first frosts
- Berries and foliage are toxic — decorative use only
Cape gooseberry & tomatillo
The edible relatives — husks in beige or green, grown for the fruit.
- Tender annuals here, sown in warmth each spring
- Cape gooseberry (Physalis peruviana): sweet amber berries
- Tomatillo: green, tart, the base of salsa verde
Browse the ornamental type in our Chinese lantern collection, or filter by botanical name under Physalis alkekengi.
Caring for Chinese lanterns — and keeping them in bounds
Care is close to nothing. Full sun gives the strongest colour, though light shade is tolerated; any free-draining soil will do. Water new plants through their first summer using the deep-soak approach in our watering guide, after which they are notably drought-tolerant. Go easy on nitrogen — heavy feeding gives lush leaves and fewer lanterns. Stems are usually self-supporting, but a windy site benefits from a low grid, as covered in our notes on supports and trellising. Cut the whole plant back to ground level once it has been frosted; it will reappear in spring.
The one real caveat is spread. Chinese lanterns travel by underground rhizomes and can colonise a border in three or four seasons. The reliable fix is to grow them in a large container, or to sink a bottomless bucket or a root barrier 30 cm deep around the clump before planting. Failing that, plant them somewhere their wandering is welcome — a wild corner, a strip by the shed — and lift stray runners each spring. A mulch keeps the surrounding ground clean and makes escapees easier to spot.
Cutting and drying the lanterns
Timing decides the result. Cut whole stems when most of the lanterns on them have turned full orange but before autumn rain starts to blotch and lace them — usually late September into October. Strip every leaf (leaves left on go limp, brown and mouldy), then either stand the stems upright in an empty vase or hang them upside down in a dark, airy, frost-free place for two to three weeks until the stems snap rather than bend. Darkness is what keeps the orange from fading, exactly as it does when drying statice. For cut-point timing, whole-pod drying, lace "skeleton" lanterns and autumn craft ideas in full detail, follow our dedicated guide to drying Chinese lanterns. Dried this way the lanterns last for years and combine beautifully with other everlastings — helichrysum, craspedia, nigella seed heads and ornamental grasses. If you like the effect, they earn a place in any cut flower garden grown from seed, alongside sea lavender. Want seed for next year? Squash a ripe berry, rinse the seed clean, dry it thoroughly and store it cool and labelled using our seed storage guide.
Common Chinese lantern mistakes
- Skipping the cold period — un-chilled seed germinates slowly and unevenly. Two to four weeks in the fridge transforms the results.
- Planting straight into a mixed border — the runners will find their way through your perennials. Container, root barrier, or a spot where spreading does not matter.
- Expecting lanterns in year one — spring-sown plants usually make foliage first and perform properly in their second season.
- Cutting too late — leave stems out through October rain and the papery cases stain, tear and skeletonise — though done on purpose, skeleton lanterns are a showpiece in their own right.
- Drying with the leaves on — strip them at cutting time, or they rot against the stems.
- Treating the berries as fruit — P. alkekengi is ornamental and toxic. Keep the dried stems away from small children and pets, and grow cape gooseberry if you want something to eat.
Frequently asked questions
Are Chinese lantern plants poisonous?
Yes — the leaves, stems and unripe berries of Physalis alkekengi contain solanine-type compounds and should not be eaten. Grow it purely as an ornamental, and keep dried arrangements out of reach of children and pets. Its relatives cape gooseberry and tomatillo are the edible members of the family.
Do Chinese lanterns come back every year?
They do. It is a fully hardy herbaceous perennial: top growth dies away after the first frosts and fresh shoots appear from the rootstock each spring, spreading a little wider each season.
Why are my Chinese lanterns still green?
Usually patience. The husks stay green for weeks while the berry inside ripens, and only colour up from late August. Deep shade, a cold summer or a very late sowing all delay it — and first-year plants often produce few or no lanterns at all.
How do I stop Chinese lanterns spreading?
Grow them in a large pot, or sink a physical root barrier at least 30 cm deep around the clump. Lifting stray runners each spring keeps an in-ground clump honest, but the barrier is the only permanent answer.
Few plants give so much autumn theatre for so little work. Give Chinese lanterns a sunny corner and something to contain their roots, and they will hand you armfuls of orange every October for as long as you keep the clump. Explore more everlasting flowers, cut flowers and perennial flowers, see what else can go in the ground this month in sow in August, browse all our seeds, or dig into the rest of our growing guides.
