Bletilla striata is something of an outlier in this series — not a fussy greenhouse epiphyte, but a terrestrial orchid that overwinters outdoors in temperate gardens, tolerates real sun, and has earned a Royal Horticultural Society Award of Garden Merit. Fact-checking it also turned up a few stories more tangled than the plant's reputation as an easy, reliable grower would suggest.
A genus-defying orchid: it can take sun and real cold, but not a late frost
Nearly every orchid covered elsewhere in this series needs protection from direct sun and a stable warm environment. Bletilla striata breaks that pattern almost entirely. Native to subtropical and warm-temperate China, Japan and Korea, its habitat includes sun-exposed rock faces and grassy slopes. In cultivation, Missouri Botanical Garden and NC State Extension rate it USDA hardiness zone 5–9, though zone 5 always comes with a caveat (heavy winter mulch required), and White Flower Farm states flatly that zone 5 and colder isn't hardy at all. The RHS doesn't use USDA zones; it rates the plant H4 on its own scale. One grower in Italy has reported pseudobulbs planted deep and well mulched surviving well below freezing (−10 to −15°C), though that's a single account rather than a general consensus. The real weak point isn't absolute winter cold at all — it's early spring. New shoots emerge unusually early, and at least one grower has reported that a single unexpected hard frost wiped out that year's flower buds entirely. This is an orchid that tolerates steady cold just fine; what it can't shrug off is a sudden one.
The naming chain's real timeline: a commonly mis-ordered step
Many casual accounts present the nomenclatural history as a straight line: Limodorum striatum (Thunberg's 1784 basionym) → Bletia striata → Bletilla striata (Reichenbach's currently accepted name). Checking the primary nomenclatural record at WFO and Kew's World Checklist of Selected Plant Families shows that step is out of order. The accepted name, Bletilla striata (Thunb.) Rchb.f., was published in 1878 in Bot. Zeitung. Bletia striata (Thunb.) Druce didn't appear until 1917 — a full 39 years later — when Druce moved the species back into Bletia. It was never an intermediate stop between Thunberg and Reichenbach; it's a later, separate recombination. This kind of "assumed" chronology is easy to copy forward uncritically in popular writing, which is exactly why this guide lays out the verified sequence instead. One more rarely-mentioned wrinkle: USDA's GRIN database flags the currently accepted name as potentially nomenclaturally problematic — stating it has "no discernible connection" to its cited basionym and would technically need a conservation proposal to resolve cleanly. POWO, WFO and Flora of China all continue to use the name as-is, and so does this guide; it's a technical footnote, not something that should confuse a buyer.
白及 vs. 白芨: an old variant, not a modern typo
Both Chinese spellings — 白及 (bai ji) and 白芨 — show up constantly in the trade, and it's tempting to assume one of them is simply a mistake. The actual history is more nuanced. Flora of China and most modern academic sources treat 白及 as the standard form, but 白芨 is not a recent corruption: the character 芨 already appears in the Taiping Yulan's citation of the Shennong Bencao Jing, meaning this variant has existed for well over a thousand years, not invented by careless modern copying. A 2024 textual-history study of classical pharmacopoeia finds 白及 was historically the more common primary form, though a number of individual scholars' own texts used 白芨 as their primary form instead, and the study recommends standardizing on 白及 going forward. This guide follows that recommendation in its own Chinese text — but a reader encountering 白芨 on a label elsewhere shouldn't assume it's an error.
The fragrance verdict: why this guide insists on "unscented"
Fragrance is the single most error-prone field in this series, and this species is no exception. The case for "fragrant" rests on exactly two uncited one-line mentions in gardening databases, plus a personal blog describing a scent so faint the grower only noticed it "for the first time" after years of growing the plant. The case for "unscented" is considerably more solid: both Wikipedia and the Encyclopedia of Life state it plainly as "scentless"; a 1995 field pollination-ecology study confirms the flowers offer no nectar reward whatsoever, consistent with deceptive, non-reward pollination; and — unusually for this kind of question — a formal piece of documentary evidence exists in the form of a US plant patent for 'Kate' (a hybrid bred from the species' own 'Big Bob' selection), which states explicitly: "Fragrance.—None detectable." Flora of China, Missouri Botanical Garden and NC State Extension's own culture notes say nothing about scent at all. Applying this series' standing rule — fragrance claims need multiple, clearly documented independent sources before being accepted — the verdict here is: do not tag this species Fragrant.
Wild population pressure: collection and habitat loss, with no medical claim attached
Bletilla striata corresponds to one of China's oldest-documented traditional medicine names, recorded as far back as the Shennong Bencao Jing. This guide treats that purely as a naming and cultural-history fact — it makes no claim about, and does not discuss, any medicinal use or effect. From a conservation standpoint, though, that medicinal-herb identity has produced a real, well-documented pressure on wild populations: multiple Chinese sources describe extensive, destructive wild harvesting for the herb trade, compounded by habitat loss, severe enough that the species was placed under Class II national protection in China's 2021 protected-plant list, with a separate assessment rating it Endangered. Worth flagging: CITES documentation itself notes that the herb-trade market is now largely — by some accounts even more than — supplied by cultivated material rather than wild-collected plants. That means the wild-pressure story is real, but this store's bare-root bulbs are propagated nursery stock, a separate matter entirely from wild collection. Interestingly, the threat profile in Japan looks quite different: Japanese red-list sources point to horticultural collecting and habitat development as the main drivers there, not the herb trade.
White, variegated, blue-purple — which of these have real botanical names, and which are just trade names?
The white-flowered form commonly sold as "Alba" corresponds botanically to forma gebina — a name that was formally published, though databases disagree on its current standing: POWO and Flora of China have folded it into the species as a synonym, while USDA's GRIN database still accepts it as a valid forma. That's a genuine, unresolved disagreement between authorities, not a settled question. By contrast, selections like 'Albostriata' (white leaf margins) and 'Soryu' (blue-purple flowers) are purely grower-selected trade cultivars that were never formally published as botanical taxa at all, and shouldn't be lumped in with f. gebina. One more thing worth being precise about: plants sold as "Bletilla × yokohama" (including 'Kate' and 'Sweet Lips') are a registered 1956 hybrid between this species and B. formosana — not pure B. striata. Go by the Latin name and registration record, not visual resemblance, when it matters.
Why this plant is worth growing — and what this guide chose not to claim
Put together, these threads describe a genuinely unusual orchid: one of the few species in this series that's truly winter-hardy outdoors, tolerant of real direct sun, and noticeably less demanding than most of the Cypripedium and epiphytic species covered elsewhere here — a reasonable first terrestrial orchid for a grower not yet ready to take on something fussier. It's also a plant whose naming history, spelling history and conservation story turn out to be considerably richer than its reputation as a simple, easy garden plant would suggest. That's the point of this series: not to present every species as uniformly easy and remarkable, but to show the disagreements, corrections and honest limits of what's verifiable — fragrance included.
Bletilla striata Care Sheet
(Thunb.) Rchb.f. — a leading species of genus Bletilla; one of the few genuinely winter-hardy, deciduous terrestrial orchids in this series
NATIVE DISTRIBUTION
Bletilla striata
China — 13 provincesJapan (C–S Honshu–Shikoku–Kyushu–Ryukyu)SW coastal KoreaMyanmar (ID unconfirmed)Hong Kong (single source)
Elevation reported at roughly 100–3200m across sources; Chinese populations concentrate around 500–1500m, while Korea's wild populations sit at just tens of metres on coastal slopes. Dashed chips mark records that remain unverified or rest on a single source. Taiwan's native look-alike is B. formosana, not this species — not to be confused. Drawn from Flora of China, POWO and GBIF specimen records.
中文 精簡卡
EN Summary
Native distribution, drawn from Flora of China / POWO / GBIF specimen records — see Plant Data below for the full province-by-province breakdown
🌏 China, Japan & Korea☀️ Rare sun-tolerant orchid⚠️ Cold-hardy, but frost-shy in spring🛡️ China Class II protected
🌎 Plant Data
Origin
Native to 13 provinces of central-to-southeastern China (Anhui, Fujian, SE Gansu, Guangdong, Guangxi, Guizhou, Hubei, Hunan, Jiangsu, Jiangxi, S Shaanxi, Sichuan, Zhejiang), plus central-southern Honshu, Shikoku, Kyushu and the Ryukyus in Japan, and southwest coastal Korea. A Myanmar record exists only as a specimen identified tentatively as "cf. striata" — flagged uncertain here. Hong Kong appears in only one source (orchidspecies.com) with no backing from Flora of China or POWO, so it's left out of the core range. Taiwan's commonly encountered look-alike is actually B. formosana, a distinct species, not this one. A naturalized population exists in Maryland, USA, from garden escapes — not a native occurrence.
Habit
A true wild species, one of five currently recognized in genus Bletilla. Unlike most tropical epiphytes covered in this series, it's a deciduous terrestrial orchid — foliage dies back completely in winter, and the plant overwinters as a flattened, partly buried pseudobulb (often loosely called a "tuber"), resprouting in spring.
Look-alikes
B. ochracea (yellow flowers) and Taiwan's B. formosana, which hybridizes with this species — the retail "Bletilla × yokohama" (registered 1956) is that cross, not pure B. striata. White-flowered plants sold as f. gebina or "Alba" carry a formally published forma name, though POWO and Flora of China treat it as a synonym of the species while USDA GRIN still accepts it as a valid forma — authorities disagree here, it isn't settled; variegated or blue-tinted selections ('Albostriata', 'Soryu') are purely grower cultivars with no formal botanical standing at all.
Habitat
Flora of China lists evergreen broadleaf forest, oak forest, conifer understory, grassy ground and rock crevices. Chinese sources often call it shade-loving, while Japanese red-list data instead emphasizes sun-exposed, slightly damp rock faces and forest-edge slopes. Reconciling both, it reads as a forest-margin, open-woodland and sunny-slope species rather than a true deep-shade plant — consistent with the light tolerance noted under Culture Data below.
Elev.
Chinese sources give roughly 100–3200m overall, with several studies noting populations concentrate around 500–1500m; Korea's wild populations instead occur at just 4–40m on coastal slopes. The 3200m figure is a literature ceiling without a specific high-elevation collection site backing it — not evidence this is a high-mountain plant.
Size
18–60cm tall, with 4–6 plicate (pleated) leaves per stem, 8–29cm long and 1.5–4cm wide. Flower stalks 14–34cm, carrying roughly 3–10 flowers per spike (cultivated plants occasionally to 14, opening in succession), each about 2.5–5.5cm across, magenta-purple to pink. The lip is white flushed with magenta and purple veining, three-lobed above the middle, spurless, with 5 longitudinal ridges on its disc.
Bloom
Flora of China: April–May flowering, fruiting by July. Western horticultural accounts extend this to June–July depending on climate and latitude. Individual flowers are short-lived, but succession of buds keeps the display going for several weeks.
Scent
Unscented. The case for "fragrant" rests on two uncited one-line database mentions plus one grower's blog describing a scent so faint it took years to notice. Wikipedia and the Encyclopedia of Life both state "scentless" outright; a 1995 field pollination study confirms flowers offer no nectar reward at all (deceptive pollination); and a US plant patent for the hybrid 'Kate' (bred from this species' own 'Big Bob' selection) formally states "Fragrance.—None detectable." Flora of China, Missouri Botanical Garden and NC State Extension's culture notes mention no scent at all. This series' standard for calling a plant fragrant — multiple clear, independent sources — isn't met here.
Conserv.
Class II protected under China's 2021 National Key Protected Wild Plants list; a separate national red-list assessment rates it Endangered (EN B1ab(iii) — criteria fit with its broad range is not independently verified here, and this guide reports the assessment as given rather than reinterpreting the criterion). The primary pressure is extensive wild harvesting for the traditional herb trade combined with habitat loss; cultivation is now widespread, and CITES CoP19 documentation notes that the cosmetics-industry market for this species is now fully supplied by cultivated stock. Japan's Ministry of the Environment red list rates it Near Threatened, with harsher local/prefectural ratings, driven there mainly by horticultural collecting and habitat development rather than herb demand. A single Korean study rates it Vulnerable, not cross-checked against an official list. CITES Appendix II (family-wide) — not Appendix I, as a few papers mistakenly state. Globally Not Evaluated on the IUCN Red List. Bare-root bulbs in the trade are typically nursery-propagated stock rather than wild-collected material, though supply-chain specifics can't be verified batch by batch.
💧 Culture Data
Difficulty
A rare beginner-friendly terrestrial in this series. Missouri Botanical Garden, NC State Extension and the Pacific Bulb Society all independently describe it as reliable, undemanding and low-maintenance, with no serious pest or disease history reported — a reasonable first terrestrial orchid for someone not yet ready for a fussier genus like Cypripedium.
Light
Tolerates far more direct sun than any tropical epiphyte in this series, but "full sun" comes with conditions — most authorities recommend bright part-shade or morning sun with afternoon shade, and full sun is only endorsed where summers are cool and the soil stays rich and moist; hot-summer regions (St. Louis, North Carolina) explicitly call for afternoon shade. Chinese understory-cultivation research found pseudobulb yield peaked at roughly 40–60% canopy closure, dropping off both when it's too open (too hot/dry) and too dense (too dark). No direct lux measurement for mature plants was found — the often-cited 6000 lx figure applies only to tissue-culture seedling acclimation, not adult plants; a rough conversion of 40–60% shade suggests somewhere around 40,000–60,000 lx of dappled light, an estimate rather than a measurement, but still well above the roughly 10,000–20,000 lx typically recommended for Phalaenopsis. This may be one of the few orchids in this series that can genuinely live in a sunny flower bed.
Temp.
A genuinely hardy terrestrial, but "hardy to which zone" doesn't resolve to one clean number. Missouri Botanical Garden and NC State Extension list USDA zone 5–9, but zone 5 always comes qualified — heavy mulch required — and White Flower Farm states flatly that zone 5 and colder is not hardy at all. Zone 6 and up is generally fine according to most sources, though the Pacific Bulb Society and the Temperate Plants Database are more conservative, rating it only 7–9 and 7–10 respectively. The RHS doesn't use USDA zones at all; it rates the species H4 (roughly −10 to −5°C, sheltered position). One grower in Italy has reported pseudobulbs surviving −10 to −15°C under dry-leaf mulch, though that's a single account, not a confirmed consensus. China's commercial herb-production standards, by contrast, require winters no colder than −5°C — stricter-sounding than the Western guidance, but that reflects a yield-protecting commercial threshold, not a survival limit; pseudobulbs buried and mulched experience far milder conditions than ambient air temperature suggests. The real vulnerability is late spring frost, not winter cold itself: at least one grower has reported that a single unexpected hard frost on the unusually early spring shoots wiped out that year's flowering entirely. No evidence was found to support a freezing vernalization requirement — core Chinese production areas see winter means of only 5–10°C, with occasional brief sub-zero dips (Guiyang's extreme low on record is −7.8°C), and still flower and mature normally, suggesting a cool dormant rest is what's needed, not a Cypripedium-style cold-stratification requirement.
Mo.
1
2
3
4
5
6
7
8
9
10
11
12
Day°C
7.5
11.2
15.9
20.9
23.8
25.4
27.7
27.9
24.9
19.6
15.4
9.3
Night°C
1.9
4.0
7.9
12.2
15.7
18.5
20.2
19.6
17.0
13.0
8.5
3.3
Source: Guiyang, Guizhou weather station (1,224m; Köppen Cwa; China Meteorological Administration 1991–2020 normals, via Wikipedia), located within the species' MaxEnt-predicted core suitable range; no lapse-rate adjustment applied. Recorded extreme low: −7.8°C. Cross-reference only — actual growing-site microclimate may differ; cold-hardy in cultivation does not mean the native habitat itself is harsh.
Media
Garden soil should be organically rich, well-drained but evenly moist loam — nothing like the bark or sphagnum mixes used for epiphytes. Heavy clay benefits from added coarse sand. Potting recipes vary by source: RHS suggests a peat-free loam-based potting mix with leaf mould, the American Orchid Society suggests sandy loam with peat moss, and some retailers suggest a loam/leaf-mould/sand blend with generous feeding. No authoritative pH figure specific to this species was found — Western sources generally call it unfussy, tolerating acid through alkaline, while Chinese cultivation standards prefer slightly acidic soil without giving a number. One option worth trying: akadama clay granules (a moisture-retentive substitute that approximates loam) blended with perlite for drainage — a self-tried substitute, not a documented standard recipe, offered here only as a starting point.
Water
Keep evenly moist through active growth (shoot emergence to late summer), matching the concentrated summer rainfall of its native range — but drainage must stay good; multiple sources stress it doesn't tolerate standing water, while a couple of others claim it grows fastest in consistently moist-to-boggy soil. Given the disagreement, the safer default is: plenty of water through the growing season, but never let the pot sit waterlogged. Dormancy calls for drier conditions — most sources say "on the dry side" rather than bone dry, a few say "barely moist" — tolerance for dormant-season dampness is better here than in most terrestrial orchids, but waterlogged dormant pseudobulbs remain one of the most commonly cited causes of death.
Feed
Recommendations range widely, from once a year to nearly every watering, but the direction is consistent: dilute, balanced feeding during active growth, none during dormancy. RHS and several retailers converge on a more conservative, consistent figure — a quarter-strength balanced liquid feed every third watering through summer. Freshly planted bare-root bulbs are better fed lightly or not at all through their first season.
Dormancy
Foliage dies back naturally in autumn; pseudobulbs then rest in the ground (outdoors) or in their pot (containers) through winter, kept on the dry side without going bone dry. No evidence supports a Cypripedium-style cold-stratification requirement for flowering. Flowering performance is more likely tied to the previous season's stored energy. Early, fast spring emergence makes this the single period of the year most worth frost-watching.
💡 Did You Know
A rare sun-loving orchid you can plant in a flower bed: Most orchids in this series need protection from strong light, but Bletilla striata's native habitat includes sun-exposed, slightly damp rock faces and open slopes, and it tolerates far more direct sun in cultivation than any tropical epiphyte covered here — even full sun where summers stay cool and the soil stays moist. That makes it one of the very few orchids genuinely suited to a temperate flower bed rather than a shade house, though a bit of afternoon shade is still wise in hot climates.
The naming chain isn't the straight line it looks like: It's easy to assume the name evolved in strict sequence: Limodorum striatum → Bletia striata → Bletilla striata. Checking the record shows that middle step is out of order — the current name, Bletilla striata (Thunb.) Rchb.f., was published in 1878, while Bletia striata (Thunb.) Druce didn't appear until 1917, a 39-year-later recombination, not an intermediate stop. A lesser-known footnote: USDA's GRIN database flags the current name as potentially nomenclaturally shaky, with "no discernible connection" to its cited basionym — though POWO, WFO and Flora of China all keep using it as the accepted name regardless.
From herbal adhesive to guqin strings — a cultural footnote, not a health claim: Bletilla striata corresponds to one of China's oldest-recorded herbal names, first noted in the Shennong Bencao Jing. Setting the herbal-trade identity aside, its pseudobulb's natural mucilage has some genuinely interesting non-medical history: classical texts record it used as an adhesive for guqin silk strings, and old Peiping (Beijing) craftsmen reportedly used the same mucilage in wall-plaster finishing. This guide treats these purely as naming and cultural-history trivia — no therapeutic use or effect is claimed or implied.
Sources: POWO, IPNI, WFO Plant List, Flora of China (via the China Orchid Flora website), USDA GRIN, GBIF specimen records and IUCN conservation category via GBIF, China's National Key Protected Wild Plants List (2021), China's Red List of Threatened Higher Plants (Qin et al. 2017), CITES CoP19 Prop. 52, prefectural red data books of Kyoto, Ibaraki and Oita (Japan), So & Song (2012), Zhang et al. (2019) Physiology and Molecular Biology of Plants, Sugiura (1995) Ecological Research, Missouri Botanical Garden, NC State Extension, Royal Horticultural Society, American Orchid Society, Pacific Bulb Society, White Flower Farm, Hayloft Plants and other nursery/grower sources. Some conservation-criteria specifics and the Myanmar locality remain only partially verified; this guide flags those limits where they occur.
When I received the plant it was packed very well and was in exceptional shape. It was in the best shape I have received from a vendor (supplier) in a very long time.
Plump and happy cattleya. I received it with some new emerging roots and in near to mature or even mature size (very excited about that). I hope that it will adapt in my conditions soon :).
