Regal lily

Appalachian-Blue Ridge forests

Arizona Mountains forests

Atlantic coastal pine barrens

Blue Mountains forests

Central Pacific Northwest coastal forests

Central Tallgrass prairie

Central-Southern Cascades Forests

Chilean Matorral

Colorado Rockies forests

A bold, clump-forming evergreen perennial from South Africa, grown for big rounded umbels of trumpet-shaped blue (or white) flowers held on tall bare stalks above arching, strap-shaped leaves in mid-to-late summer. It is widely sold as "lily of the Nile," but that is a misnomer - the plant is South African (the Cape provinces and KwaZulu-Natal), not from the Nile. Spectacular and easy in warm climates, this evergreen Agapanthus is frost-tender, so in cold-winter areas it is grown in a container and overwintered under cover. The RHS has given several Agapanthus praecox forms its Award of Garden Merit and rates this evergreen species half-hardy (H3 - needs winter protection).

What it needs

Conditions

Light

Full sun / Part shade

Water

Moderate water

Spacing

18"

Habit

Upright summer bulb throwing a single rigid, reddish-purple, often glaucous stem 3 to 5 feet tall - sometimes 6 feet when well established - clothed to the top in narrow lance-shaped leaves 3 to 5 inches long and finished with an outward-facing cluster of large trumpets. Missouri Botanical Garden puts the spread at 9 to 12 inches, which describes one stem rather than the plant: a settled bulb splits over time into a clump of several stems, and Missouri Botanical Garden notes that in good conditions each bulb multiplies into a large clump. The bulb itself is the thing to picture - up to 4 inches across, ovoid, built of thick overlapping white scales with no papery tunic over them. It is also a STEM-ROOTING lily, putting out a second set of roots from the buried length of stem above the bulb, and that single fact sets the planting depth.

Care tips

•

Treat the bulb as perishable, because it is. A lily bulb is a stack of loose fleshy scales with no papery tunic, so unlike a tulip or a daffodil it never really dries down and it will not sit in a shop bag for a month without cost. Buy plump and firm, plant the day it arrives, and pot it up rather than store it if planting has to wait.

•

Plant it 6 to 8 inches deep and mean it. Regal lily is stem-rooting: it makes a second root system on the buried stem above the bulb, and that is where a good part of its anchorage and feeding comes from. Depth is genuinely load-bearing in this genus in a way it is not for most bulbs - and it runs the other way for Lilium candidum, which goes in an inch deep.

•

If you garden anywhere in the northeastern US or eastern Canada, plan for the lily leaf beetle before you plant. The adult is a bright scarlet beetle about 0.3 inches long, easy to spot and easy to hand-pick if you get out early and often; the larvae are the destructive stage and disguise themselves under a wet shield of their own excrement on the leaf undersides. Check from the moment shoots emerge, hand-pick daily in spring, and squash the orange egg lines along the leaf midribs. Parasitoid wasps released as biological control have brought numbers down in parts of New England, but they have not reached most gardens.

Lifecycle

Planting

Plant bulbs in autumn or early spring, 6 to 8 inches deep - slightly less in heavy clay - and 18 to 24 inches apart, in groups of at least three. The depth is not a rounding of general bulb advice: regal lily is stem-rooting, so the buried stem above the bulb generates its own root system, and a shallow planting simply forfeits that anchorage and that feeding zone. This is the sharpest split inside the genus and worth carrying between records: Lilium candidum is basal-rooting and goes in barely an inch deep with its nose at the surface, so following candidum's instructions here, or these instructions there, ruins the plant. Missouri Botanical Garden asks for average, medium, well-drained soil in full sun to part shade, prefers rich organic ground, and adds two siting notes that read as small and are not - mulch to keep the root zone cool, and protect from wind.

Transplanting

Move bulbs in autumn once the stems have yellowed, and move them FAST. A lily bulb is a stack of loose fleshy scales with no papery tunic over it, so it has no dormant storage skin the way a tulip or a daffodil does; it never fully dries down, and a few weeks in an open bag on a shelf desiccates the scales and costs the bulb its first-year performance. Buy plump, buy late, plant the day it arrives, and if you truly cannot, pot it up or heel it into damp bark rather than leaving it bare. This is the single most useful practical difference between true lilies and the tunicate bulbs sold alongside them.

Early growth

Fast and untroubled. The main early-season jobs are frost watch - the emerging shoot is the frost-tender part, not the bulb - and beetle patrol from the moment growth shows. Feed lightly rather than richly; nitrogen buys a taller stem that needs more staking. Missouri Botanical Garden calls staking advisable for this tall lily even though the stems are strong, and single canes tied loosely just below the flower cluster are less obtrusive than a ring.

Maturity

Genuinely low-trouble by lily standards, with a specific list. Missouri Botanical Garden: the lily leaf beetle is a significant pest in some areas; aphids attack buds and carry mosaic virus, for which there is no cure and the plant must be removed; in hot and humid areas raised beds avoid fungal problems; mice, voles, gophers and chipmunks eat the bulbs, so wire cages or buried pots; deer and rabbits eat leaves, buds and flowers. The fungal problem behind the raised-bed advice is usually Botrytis elliptica, lily disease - reddish-brown blotches spreading over the leaves in a wet, still, warm spell, worst in crowded plantings with no air movement. RHS also lists slugs, snails and thrips. None of this reads as heavy for a plant of this quality; the beetle is the only entry that will actually cost you the plant year after year.

Propagation

Seed is the headline, and regal lily is one of the few lilies where seed is the sensible route rather than a specialist project. Germination is epigeal and immediate - the seed leaf comes straight up rather than sitting through a warm-then-cold sequence like many lilies - and Wikipedia records seedlings often flowering in the second year, with three the norm. Two consequences worth acting on. Seed does not carry lily mosaic virus, so a seed-raised batch starts clean where divided or bought stock may not. And seed is how you get a DRIFT: a hundred seedlings for the price of one bulb is a scale of planting nobody buys. Scaling works too - snap thick outer scales off a lifted bulb, keep them in barely damp vermiculite, and each makes bulblets - and offsets can simply be separated after the foliage dies down, which is the RHS route.

Pollination

Self-fertile

Self-compatible, which is unusual enough within the genus to be the practical reason this species seeds so freely. The contrast is documented in the interspecific-cross literature, where reciprocal crosses between the self-INCOMPATIBLE Lilium longiflorum and the self-COMPATIBLE L. regale are the standard example of unilateral incompatibility - so of the two siblings in this wave, the Easter lily needs another clone's pollen and the regal lily does not. A solitary regal lily therefore sets full capsules of viable seed with no partner, and the flower's actual pollination syndrome is nocturnal: a long white tube, an outward-facing mouth and a scent that intensifies after dark is the textbook hawkmoth signature. Cutting flowers before the anthers dehisce, or snipping the anthers out, is worth doing for a different reason entirely - lily pollen stains fabric permanently and is the specific hazard to cats.

Plants don't grow alone

Pollinates

Moth

Hawkmoths (Sphingidae (family-level entry))

The flower is built for a long-tongued nocturnal moth and for almost nothing else: a white 6-to-8-inch tube, an outward-facing mouth, no landing platform, and a fragrance that Wikipedia records as strongly scented especially at night. That combination is the classic sphingophily syndrome, and hawkmoth pollination has been confirmed by field study in the closely related Chinese trumpet lily Lilium sargentiae. Marked plausible rather than documented because no published pollinator observation exists for L. regale itself - the syndrome and the confirmed sister species are the evidence, not a species-on-species record. Note the practical consequence for gardeners in North America and Europe: the moths that shaped this flower are Sichuan moths, and the plant fruits perfectly well here without them because it is self-compatible.

Pollen forage

Bee

European honeybee (Apis mellifera)

Honey bees work the huge rust-orange anthers for pollen through the day and are the visitor most gardeners actually see on a regal lily. It is worth being clear that this is opportunistic pollen collection rather than the relationship the flower evolved for - the nectar sits at the bottom of a 6-inch tube no honey bee reaches, so the bees take pollen and leave the nectar to the night shift.

Foliage forage

Mammal

White-tailed deer (Odocoileus virginianus)

Missouri Botanical Garden states plainly that deer and rabbits eat the leaves, buds and flowers, and RHS lists rabbit and vole damage on the same species. Lilies are among the plants deer take preferentially rather than as a last resort, and a browsed stem does not regrow that season, so in deer country this is a fenced plant or a container plant. The bulb has its own predators below ground - mice, voles, gophers and chipmunks in Missouri Botanical Garden's list - which is what wire cages and buried pots are for.

For people

Toxic - do not consume

Not edible, and the toxicity that matters is not to you. True lilies - Lilium and Hemerocallis - cause acute kidney injury in CATS, and the exposure threshold is genuinely small: the nephrotoxin is water-soluble and present in every part of the plant, and documented cases have followed contact with POLLEN alone, groomed off a coat after a cat brushed a cut stem or a dropped anther. Signs appear within about 24 hours, the treatment window is roughly 18 hours before renal damage becomes irreversible, and mortality in delayed cases has been reported from 50 percent up to total. The practical rule is blunt: a household with a cat should not grow lilies in the garden the cat uses, and should never bring lily cut flowers indoors, regardless of how the vase is positioned. Dogs get gastrointestinal upset rather than kidney failure, and humans are not the concern here. The genus is separately worth distinguishing from the daylily people plant for eating - Hemerocallis buds are a genuine vegetable in East Asian cooking and are just as lethal to cats, so the two facts have to be held together.

Native range

AHS heat range

1-8

Climate notes

•

The native range is one WGSRPD region and one only: CHC, China South-Central. That is the narrowest distribution in this wave by a wide margin and among the narrowest in the catalog, and it is not an artefact of poor data - regal lily is a genuine local endemic, restricted to roughly fifty miles of dry cliffs, screes and river terraces along the Min River (Minjiang) valley in Sichuan, between about 1,500 and 2,700 m. Provenance is worth stating precisely: POWO answered directly for this species, so the range above is first-hand Kew data rather than a WCVP row read through an aggregator.

•

Kew additionally flags Alabama, Mississippi, Argentina Northeast, Brazil South and Bulgaria as INTRODUCED occurrences, and those are excluded from the native range mapped here. The contrast with its sibling matters more than the list does. Tiger lily (Lilium lancifolium) carries an introduced list of roughly forty regions across eastern North America and Europe and is a naturalising garden escape; regal lily has five, all of them scattered, and is not a plant that runs. It seeds freely in a seed pan and hardly at all outside one.

•

Missouri Botanical Garden gives USDA zones 4 to 8, and RHS rates it H6 - hardy through the whole of the UK and northern Europe. The vulnerable moment is not midwinter but late spring: the shoot emerges early and is frost-damaged where the bulb is not, so a frost pocket costs a season of flowers on a plant that would have been perfectly hardy sitting still.

•

Heat and humidity are handled by drainage rather than by shade. Missouri Botanical Garden advises raised beds for lilies in hot and humid areas specifically to avoid fungal problems, and the fungus in question - Botrytis elliptica - is a still-air, wet-foliage disease. In a humid summer garden that translates into wide spacing, morning sun to dry the leaves, and no overhead watering, rather than into moving the plant into shade.

•

Lime is where regal lily separates itself from most of the genus. Its wild ground is gravelly, fast-draining and calcareous - neutral to slightly alkaline - and RHS lists chalk among the soils it grows on alongside clay, loam and sand. The Oriental lilies (Lilium auratum, L. speciosum) are strict lime-haters that go chlorotic on the same soil. On a thin chalk or limestone garden, regal lily is one of the few lilies to reach for rather than fight.

•

The whole cultivated population traces to a handful of Sichuan collections by one man, which usually implies a genetic bottleneck. It appears not to be one: an ISSR study of the wild Minjiang valley populations found surprisingly high genetic diversity within this narrow endemic range, so the seed strain in commerce is not the impoverished thing the collecting history would suggest.

Similar plants

Browse lateral options with similar roles, light needs, size, or native-range overlap; these are not filtered for a better climate fit.

Agapanthus praecox

African lily

Asiatic hybrids are the easiest lilies to grow and among the first to bloom - rigid, unbranched 3-4 foot stems carry large, mostly upward- and outward-facing flowers 4 to 6 inches wide in nearly every color but blue, often with dark basal spotting. The flowers are showy and good for cutting but, unlike most other lily groups, usually have little or no fragrance. Every part of the plant is dangerously toxic to cats.

Lilium (Asiatic hybrid)

Asiatic lily

Hylotelephium 'Herbstfreude'

Autumn-joy stonecrop

A clump-forming herbaceous perennial grown for its showy late-season flower heads: masses of tiny star-like flowers borne in flattened cymes 3 to 6 inches across that emerge rosy pink, deepen to rose-red, and fade to coppery-rust as they die. Gray-green, fleshy, succulent-like leaves form upright clumps to about 24 inches. Easily grown in dry-to-medium, well-drained soil in full sun, it is drought tolerant and attracts butterflies, and its foliage and dead inflorescences persist into winter for added interest.

Scadoxus multiflorus, the blood lily (also fireball lily, ball lily, powderpuff lily), is a summer-growing bulbous geophyte in the Amaryllidaceae, native across tropical and southern Africa to the southwestern Arabian Peninsula. Each bulb sends up a leafless stem topped by a dramatic globe-shaped umbel of scarlet flowers with protruding stamens, often before or alongside the foliage. It is a focal-point container and bedding bulb prized for its bold flower head, but it is decidedly tender - RHS rates it H1B (minimum 50 to 59°F), so outside roughly USDA zones 9b–11 it must be grown under glass or as a houseplant and dried off / overwintered frost-free. CRITICAL CAUTION: every part is toxic - Scadoxus contains poisonous alkaloids and has been used as a component of arrow and fishing poisons; the bulbs are ornamental, not edible, and the plant is harmful to people, pets, and grazing animals if ingested. Handle with gloves and keep away from children and animals.

A long-lived native perennial of central and eastern US woodland borders and prairie meadows with deep blue pea-shaped flowers in late spring, blue-green leguminous foliage, attractive black seed pods for winter interest, and a nitrogen-fixing root system (Fabaceae). Larval host for 6 documented butterfly species per NC State (orange sulphur, clouded sulphur, frosted elfin, eastern tailed-blue, hoary edge, wild indigo duskywing) - among the highest Lep-host-count perennials in the eastern flora.

A bold, clumping rhizomatous perennial grown for its elegant, pure-white funnel-shaped flowers - actually a curved spathe wrapped around a yellow finger-like spadix - held on tall stems above large, glossy, arrow-shaped deep-green leaves from late winter into summer. Native to the wetlands and seeps of southern Africa, Zantedeschia aethiopica is the classic florist's calla and a striking water-margin and container plant, thriving in consistently moist to wet rich soil in full sun to part shade. It is tender (hardy in zones 8a-10b), where it overwinters in the ground and can be near-evergreen; colder gardeners grow it from lifted rhizomes or under heavy mulch. Two cautions are load-bearing: every part is toxic if eaten (calcium-oxalate raphides), and in mild, wet climates it can escape and naturalize into an invasive weed.

Zantedeschia aethiopica

Calla lily