Lily (Lilium)
A true lily is any plant in the genus Lilium: a bulb that sends up a single leafy stem topped with large, usually six-petaled flowers, often trumpet-shaped and frequently scented. That definition matters more than it sounds, because many plants sold as “lilies” are nothing of the kind, and the difference decides both how you grow them and, for cat owners, whether they are safe to bring indoors at all.
This guide covers the real Lilium: the main garden types and how they differ, how deep to plant the bulbs and where, when they bloom and whether they return, how to keep cut stems fresh, and the fact that overrides everything else, which is that true lilies are deadly to cats. If you read one section, read the toxicity one.
A clear, step-by-step guide to soil, planting, watering, feeding, pruning, and winter care. Includes zone timing, container tips, companions, and quick fixes for common problems.
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Planting lilies in layers with spring bulbs for a succession of blooms from March to August
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The red lily beetle invasion and how to protect your lilies from this destructive pest
Best lily varieties from elegant Oriental Stargazer to towering Orienpet tree lilies
Growing lilies in containers for balcony and patio gardens with dramatic height
Lily meaning and lily colour meanings, honestly explained
On this page
🌱 Taxonomy and origin
Lilium is a genus of roughly 80 to 100 species in the family Liliaceae, spread across the temperate Northern Hemisphere, with the greatest natural diversity in East Asia (China, Japan, and the Himalayan region) and additional species native to Europe and North America. Every true lily grows from a scaly bulb and produces a flower with six tepals, which is the trait that separates the genus from its many imitators. Familiar species include the Madonna lily (Lilium candidum) from the eastern Mediterranean, grown since antiquity, and the tiger lily (Lilium lancifolium) from East Asia. Most garden lilies you buy are not pure species but hybrids, sorted into horticultural divisions such as Asiatic, Oriental, trumpet, and others.
The bigger source of confusion is the long list of plants that carry “lily” in the name without belonging to the genus. Daylilies are Hemerocallis, in a different family entirely; each bloom lasts a single day, and the leaves are strap-like, growing from a clump of fleshy roots rather than a bulb. The calla lily is Zantedeschia, an arum that grows from a rhizome and forms a colored spathe wrapped around a central spike, not a six-petaled flower. The peace lily (Spathiphyllum) is another arum, sold as a houseplant. Lily of the valley and canna lily are likewise unrelated. If the plant grows from a true scaly bulb and opens a six-tepaled flower on a leafy stem, it is a Lilium; if not, it is one of the look-alikes, and the care and toxicity rules below do not transfer cleanly.
| Is it a true lily? | Genus / family | Grows from | Tells it apart | Cat toxicity |
|---|---|---|---|---|
| True lily | Lilium, Liliaceae | Scaly bulb | Six-tepaled flower on one leafy stem | Deadly (kidney failure) |
| Daylily | Hemerocallis, Asphodelaceae | Fleshy roots | Each bloom lasts one day, grassy leaves | Deadly (kidney failure) |
| Calla lily | Zantedeschia, Araceae | Rhizome | Colored spathe around a spike | Milder oxalate irritation |
| Peace lily | Spathiphyllum, Araceae | Rhizome | Houseplant, white spathe | Milder oxalate irritation |
The garden lilies people actually grow fall into a handful of divisions that differ in scent, bloom time, and stature, and choosing among them is most of the decision. Asiatic lilies are the earliest, hardiest, and easiest, in bold colors but with little to no scent. Oriental lilies bloom later, stand taller, and carry the heavy sweet perfume most people picture, including cut-flower favorites like ‘Stargazer’ and ‘Casa Blanca’. Easter lilies (Lilium longiflorum) are the white trumpets forced for spring. Trumpet lilies are tall and strongly scented, and tiger lilies are the freckled, recurved orange types that also spread by little bulbils.
| Division | Scent | Bloom time | Typical height |
|---|---|---|---|
| Asiatic | Little to none | Late spring to early summer | 1 to 4 ft |
| Oriental | Strong, sweet | Mid to late summer | 3 to 5 ft |
| Easter (longiflorum) | Moderate, sweet | Early summer | 2 to 3 ft |
| Trumpet | Strong, sometimes spicy | Mid summer | 4 to 6 ft |
| Tiger | Mild | Mid to late summer | 3 to 5 ft |
🌸 Bloom time
True lilies flower across the warm months, and choosing types from different divisions stretches the display from late spring into early fall. Asiatic hybrids open first, roughly May to June, followed by trumpets, Aurelians, and many species through late June and July, with Oriental hybrids closing the season in July and August. Each stem carries several buds that open in succession rather than all at once, so a single flower lasts only a few days but a stem stays in flower for one to two weeks. Planting a mix of early, mid, and late divisions in one bed gives months of color from a single planting.
📏 Height and spread
True lilies range from about 1 foot to well over 6 feet depending on type. Dwarf and patio selections stay 1 to 2 feet, the typical garden lily reaches 3 to 4 feet, and the giant Oriental and trumpet “tree lilies” push past 6 feet in a mature clump. Each bulb usually throws a single upright stem, occasionally two, with foliage only 6 to 12 inches wide, so lilies take up little horizontal room and slot easily between other plants. Space bulbs 8 to 12 inches apart so the stems can stand without crowding, and plant the tall divisions where they have something to lean into or a stake, since heavy flower heads can topple a thin stem in wind or rain.
☀️ Light
Six hours of direct sun a day is the minimum, with full sun to light afternoon shade giving the strongest stems and the most buds. Too little light makes plants stretch, grow spindly, and flower poorly. The classic advice is to keep the head in the sun and the feet in the shade: the flowering top wants full exposure while the bulb and roots prefer to stay cool, which a layer of mulch or a low groundcover around the base provides. In hot southern gardens a little shade during the fiercest afternoon hours protects the flower color without costing bloom.
💧 Water
Steady moisture through the growing season suits lilies, but they will rot in standing water, so drainage matters as much as watering. Keep the soil lightly moist, like a wrung-out sponge, and water deeply once the top inch or two has dried rather than giving frequent shallow sips; in moderate climates that usually means watering once or twice a week. Water at soil level instead of over the foliage, since wet leaves invite fungal disease. After flowering in late summer many lilies tolerate drier soil as they head toward dormancy, though Oriental types still appreciate water during hot dry spells while their foliage is green and feeding the bulb.
🌍 Soil and pH
Fertile, free-draining soil is the non-negotiable requirement; a loose loam or sandy loam is ideal, and heavy clay should be opened up with compost and coarse grit before planting or the bulbs will rot. Most lilies are happy in a soil pH of 6.0 to 7.0. Oriental and trumpet types lean toward the acidic end, around 6.0 to 6.5, while Asiatics tolerate up to about 7.5. Plant depth is the rule that decides whether the stem can support itself: set bulbs about two to three times their own height deep, which for most lilies means 4 to 6 inches of soil over the top. The one exception is the Madonna lily (Lilium candidum), which is planted shallowly with its nose just below the surface.
❄️ USDA hardiness
Most garden lilies are hardy across USDA zones 4 to 9, with the division setting the exact range. Asiatic lilies are the toughest, reliable from zone 3 (or even colder with a winter mulch) up to about zone 8 or 9. Oriental lilies run zones 4 to 9, trumpets and Orienpets roughly zones 4 to 8, and martagon lilies cope down to zone 3, withstanding winters near minus 40 degrees. In the coldest regions a winter mulch of straw or shredded leaves protects the bulbs, and in the very warmest zones (9 and above) lilies often lack the winter chill they need, so bulbs may have to be pre-chilled before planting or treated as a one-season planting.
🌼 Propagation and longevity
A healthy lily bulb lives and reblooms for many years, often multiplying into a fuller clump over time, so the main “propagation” job is simply dividing crowded plantings. Every three to five years, or whenever flowering thins out, lift the clump in fall or early spring, separate the offset bulblets, and replant them at the proper depth; small divisions take a year or two to reach blooming size. Tiger lilies and some Asiatics also make tiny bulbils in the leaf axils that can be picked off and planted half an inch deep, flowering in two to three years. Scaling, where outer bulb scales are peeled and set in a moist medium to sprout new bulblets, and growing from seed (two to six years to bloom, and hybrids will not come true) are slower routes. Whatever the method, let the foliage die back naturally after bloom rather than cutting it green, because those leaves are recharging the bulb for next year.
👃 Fragrance
Scent in lilies tracks the division, so fragrance is something you choose at purchase rather than something you can coax later. Oriental hybrids such as ‘Casa Blanca’ and ‘Stargazer’ carry the famous heavy, sweet perfume that can fill a room, and trumpet lilies and Orienpets are strongly scented too, sometimes with a spicy edge; Lilium regale is prized for its rich fragrance. Asiatic lilies, by contrast, have little to no scent, which makes them the better pick for anyone sensitive to perfume or for tight indoor spaces. The fragrance comes from the petals and their oils, not the pollen, so removing the anthers will not quiet a scented lily, though it does prevent staining.
⚠️ Toxicity and pet safety
This is the section that matters most. True lilies (any Lilium) and daylilies (Hemerocallis) are among the most dangerous plants you can bring near a cat. Every part is toxic to cats: the petals, leaves, stems, pollen, and even the water from a vase that held cut lilies. The poisoning does not depend on the cat eating much. A cat that chews a single leaf or petal, licks a few grains of pollen off its fur while grooming, or drinks lily vase water can develop acute kidney failure, fatal in under three days if untreated. Early signs are vomiting, drooling, and lethargy within hours, progressing to the kidneys shutting down and the cat producing little or no urine. Any suspected exposure is a same-day veterinary emergency: do not wait to see if symptoms appear, because treatment works best when started within the first 18 hours and may not save a cat once the kidneys have failed. The simplest safe rule for a cat household is to keep true lilies and daylilies out of the home and garden entirely.
Dogs are far less affected. A dog that eats lily plant material may get an upset stomach, but true lilies do not cause the catastrophic kidney failure in dogs that they cause in cats. The look-alikes carry a different, milder hazard: the calla lily and the peace lily are arums, not true lilies, and their toxicity comes from insoluble calcium oxalate crystals that irritate the mouth and throat of a cat or dog that bites them, causing drooling and oral pain but not the kidney injury true lilies inflict. Lilies are not poisonous to humans, and the bulbs of a few species are even eaten in Asian cooking, but that is no reason to relax around cats. If you share a home with cats, the safer choice is a different bouquet; for pet-friendly options see the guide to flowers that are safe for cats and dogs.
🌿 Vase life
Cut lilies are among the longest-lasting florist flowers, holding about a week and often up to two weeks indoors because each stem opens its buds in sequence. Buy or cut stems when the first one or two buds are just starting to color and open and the rest are still closed, so the display unfolds in the vase. Strip the lower leaves that would sit underwater, recut the stems at an angle, and stand them in clean lukewarm water with floral preservative, kept in a cool spot away from direct sun and ripening fruit; change the water and trim the ends every couple of days.
The pollen is the catch. As lily flowers open, their large anthers release a rust-colored pollen that permanently stains petals, skin, clothing, and furniture. The standard practice is to pinch or snip off the anthers with a tissue as each flower opens, which prevents staining and keeps the bloom looking clean a little longer. If pollen does land on fabric, lift it with sticky tape or a dry brush rather than rubbing, since rubbing or wetting it drives the stain in. And the warning from the toxicity section applies in full here: that same vase water and pollen are lethal to cats, so a cut-lily arrangement does not belong in a home with cats no matter how careful the placement.
🐛 Pests and diseases
The signature pest is the red lily leaf beetle (Lilioceris lilii), a bright scarlet beetle about 8 mm long whose larvae, which coat themselves in their own excrement, can strip leaves, buds, and stems quickly; handpicking adults and larvae is the front-line control. Aphids matter less for the feeding damage than for the viruses they spread, while thrips blemish petals, and slugs and snails chew young shoots in damp, shady spots. Larger raiders include deer browsing buds and foliage and voles or mice eating the bulbs underground.
On the disease side, the common problems are fungal and viral. Botrytis (lily gray mold, sometimes called lily fire) shows up as brown spots with concentric rings on leaves and petals, spreading as a fuzzy gray mold in cool, wet, crowded conditions, which is why good spacing and watering at soil level pay off. Basal rot, caused by Fusarium and related fungi, rots the bulb from the base in warm, wet soil and collapses the shoot, and good drainage is the main defense. Several aphid-borne viruses (lily mosaic, lily symptomless virus, cucumber mosaic virus and others) cause mottling, streaking, and color break; there is no cure, so infected plants should be removed before the aphids spread them further.
FAQ
Are lilies poisonous to cats?
Yes, dangerously so. All true lilies (Lilium) and daylilies (Hemerocallis) can cause fatal kidney failure in cats from even a tiny exposure, including pollen and vase water. Any contact is a same-day veterinary emergency. The safest choice is to keep them out of any home with cats.
Are lilies poisonous to dogs?
Far less. A dog that eats lily material may get a stomach upset but does not face the kidney failure that kills cats. Calla and peace lilies (which are not true lilies) cause mouth irritation in dogs from oxalate crystals.
How deep do you plant lily bulbs?
About two to three times the height of the bulb, which for most lilies is 4 to 6 inches of soil over the top, pointed end up, spaced 8 to 12 inches apart. The Madonna lily is the exception and is planted shallowly.
When do you plant lilies?
Fall is ideal, especially mid to late fall in cold climates so the bulb roots before winter. Spring planting also works in harsh-winter areas and blooms a little later the same year.
Do lilies come back every year?
Yes, they are perennials and the bulbs multiply over time, giving more stems and flowers. If blooms thin out after several years, the clump is usually overcrowded and ready to divide.
What is the difference between Asiatic and Oriental lilies?
Asiatic lilies bloom earlier (late spring to early summer), stand shorter, come in bold often spotted colors, have little scent, and are the hardiest and easiest. Oriental lilies bloom later (mid to late summer), grow taller, carry large strongly perfumed flowers, and prefer slightly acidic soil.
How long do cut lilies last?
About one to two weeks, since the buds open in sequence. Remove the pollen-bearing anthers as flowers open to prevent staining, recut the stems, and refresh the water every few days.
Why won't my lilies bloom?
The most common cause is too little sun (they need six-plus hours). Other causes are overcrowded or aging bulbs, too much nitrogen feeding leaves at the expense of flowers, foliage cut down too early the previous year, or weakening by pests or virus.
Interesting tips
The most useful habit after flowering is to resist tidying. Deadhead the spent flowers so the plant does not waste energy setting seed, but leave the stem and leaves standing until they have turned fully yellow or brown in fall, then cut to the ground; those green leaves are feeding next year’s bulb, and removing them early is a leading reason lilies stop blooming. When cutting stems for the vase, take no more than about two-thirds and leave at least a third of the leafy stem in the ground for the same reason.
A couple of practical notes round out the genus. Lilies have been cultivated for thousands of years, with the Madonna lily appearing in Minoan frescoes and grown by the ancient Greeks and Romans. And there is no naturally blue true lily, because the genus lacks the genes to make blue pigment, so any “blue lily” on sale is dyed or mislabeled.
Related Guides & Flowers
- Daylily (Hemerocallis) – Lily-like blooms and strappy foliage; great for long summer color and easy care.
- Calla Lily (Zantedeschia) – Elegant trumpets for borders and bouquets; rhizomatous, not a true lily.
- Irises (Iris spp.) – Sword-like leaves and dramatic flowers; pairs well with lilies in mixed borders.
- Daffodils (Narcissus) – Spring bulbs with trumpet forms; extend the bulb display before lily season.
- Tulips (Tulipa) – Iconic spring bulbs; plan succession plantings with lilies for continuous bloom.
- Agapanthus – Umbels on tall stalks and strappy leaves; a bulb-like accent for summer displays.
- Gentian (Gentiana) – Bell or trumpet-shaped blooms in deep blues; a niche pick for cool hues.
- Virginia Bluebells (Mertensia virginica) – Spring woodland bells; gentle, lily-adjacent look for shade gardens.
- Bellflower (Campanula) – Bell-shaped flowers and cottage-garden charm; complements lily borders.
- Oncidium Orchid – Airy sprays for indoor display; refined, florist-friendly alternative to lilies.
- Ranunculus – A wedding staple with layered petals; overlaps with lilies in floral design use.
- Love-in-a-Mist (Nigella) – Delicate, airy blooms and ornamental seed pods; a rare but striking companion.
References
Written by: Your Flowers Guide editorial team
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