Daylily vs Lily: The Mix-Up That Leads to Wrong Care All Season
Daylilies and true lilies share a name but belong to different plant families. Learn the one-look ID test, care differences, and the critical pet safety distinction.
Walk into almost any garden center in June and you will find plants labeled simply “lily.” Some are daylilies. Some are true lilies. The tags rarely bother to say which, and the flowers look similar enough that most people never notice the difference — until they try to care for one the way the other needs to be cared for, or bring one home with a cat in the house.
Daylilies and true lilies are not varieties of the same plant. They belong to completely different botanical families, grow from entirely different underground structures, and carry different toxicity profiles for pets. The name “lily” attached itself to daylilies centuries ago and stuck — but the word tells you nothing useful about what the plant actually is.
Here is what you need to know to tell them apart at a glance, grow each one well, and make an informed choice for your garden.
They Are Not Even in the Same Family
True lilies belong to the genus Lilium, family Liliaceae — one of the classic lily families that includes tulips, hyacinths, and fritillaries. Daylilies belong to the genus Hemerocallis, family Asphodelaceae. These two families diverged hundreds of millions of years ago. Calling a daylily a lily is roughly like calling a crocodile a lizard: superficially similar, fundamentally different.
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The name Hemerocallis comes from the Greek hemera (day) and kalos (beautiful) — a reference to the fact that each individual flower opens at dawn and wilts by nightfall. It says nothing about lilies. Taxonomists knew these were separate plants from the start; the common name confusion belongs entirely to the vernacular.
The confusion was cemented by one plant in particular: Hemerocallis fulva, the common orange daylily. Native to Asia, it was introduced to Europe and North America centuries ago and escaped cultivation so successfully that it now grows along roadsides, railroad banks, and field edges across much of the United States. People see it blooming in ditches every June, assume it must be a wild lily, and the association takes hold. According to Wikipedia’s botanical records, H. fulva is now considered an invasive weed in parts of North America — which means the plant that taught generations of gardeners to conflate daylilies with lilies is not even native here.
The taxonomy has been updated twice in recent decades. Under the APG III system in 2009, daylilies were moved from Liliaceae into Xanthorrhoeaceae. Under the APG IV system in 2017, that family was renamed Asphodelaceae. The science has clarified the separation repeatedly; the common name has simply refused to follow.
The One-Touch Identification Test
You can tell a daylily from a true lily in under five seconds. Run your fingers along the flower stem from the base upward.
Daylily: The flower stem — called a scape — rises straight from a clump of basal foliage and is completely bare. No leaves on the stem. The green leaves stay down at ground level in their grass-like fan. The scape is just a naked stalk with buds at the top.
True lily: The stem is covered with leaves from bottom to top. Depending on the species, those leaves are either whorled (arranged in circular tiers around the stem, like a pagoda) or alternate (staggered along the stem’s length). In either case, you feel and see greenery the full length of the stalk.
According to Lincoln County UGA Extension, true lilies produce a single stem with flowers forming at its top and leaves growing in whorls or spirals along its entire length. Daylilies, by contrast, form long flat leaves only at the crown of the plant, sending up multiple bare scapes from the same basal clump.
If you cannot touch the plant, look for the grass-like fan of foliage at soil level. If the leaves emerge from a tight fan at the base and the flowering stems are separate naked stalks, you have a daylily. If the leaves grow along the stem itself, you have a true lily.
Quick Comparison: Daylily vs True Lily
| Feature | Daylily (Hemerocallis) | True Lily (Lilium) |
|---|---|---|
| Botanical family | Asphodelaceae | Liliaceae |
| Root structure | Fleshy rhizome / tuber | Scaly bulb (no papery tunic) |
| Leaves | Basal fan (grass-like, at ground level) | Along stem (whorled or alternate) |
| Flower stem | Naked scape (no leaves) | Leafy stem (leaves top to bottom) |
| Bloom duration | 1 day per flower | Several days to 1 week per flower |
| USDA zones | 3a–9b | 3a–8b (varies by type) |
| Height | 1–3 ft | 1–6 ft (type dependent) |
| Light | Full sun or partial shade | Full sun or partial shade |
| Water needs | Drought tolerant once established | Consistent moisture; avoid bulb rot |
| Difficulty | Very easy | Easy to moderate |
| Toxic to cats | Yes (kidney failure) | Yes (kidney failure) |
| Toxic to dogs | Less severe (mild GI upset) | Less severe than cats (GI upset) |
| Flowers edible | Yes (some species) | No — toxic |
| Cost (per plant) | $5–$25 per fan | $4–$15 per bulb |
Daylily: Anatomy and Growth
The daylily grows from a fleshy tuberous root system — not a bulb. Dig one up and you find a mass of thick, fleshy roots spreading outward from a central crown. This crown sends up new fans of arching, grass-like foliage each spring and produces bare flower scapes (the correct term for those leafless stems) from late spring through summer, depending on the cultivar.
Each scape carries multiple buds. Each bud opens once and is done — that is the defining characteristic of the genus. However, a single scape may carry 12 to 20 buds that open in sequence over two to three weeks, and an established clump can send up dozens of scapes. The net result is a long bloom season that looks continuous even though each individual flower is a one-day performance.
As of 2024, the American Hemerocallis Society’s registry surpassed 100,000 registered cultivars — a milestone reached in 2024 that makes the daylily one of the most cultivar-rich plants in horticulture. Colors range from pale cream through every shade of yellow, orange, pink, red, and near-purple. Many modern cultivars rebloom — they send up a second or third flush of scapes after the first bloom period ends.
One further distinction competitors rarely mention: some daylily species produce edible flowers. Hemerocallis citrina flowers are a traditional ingredient in Chinese cooking, sold fresh or dried in Asian grocery stores. The flower buds of H. fulva are also eaten in parts of East Asia. This is in sharp contrast to true lilies, whose flowers are toxic. If you are growing daylilies in a kitchen garden, the flowers can go in salads or stir-fries — but only if you are certain of the species identity.
For a wider list of plants that thrive alongside daylilies in mixed borders, see our guide to the best perennials for your garden.
True Lily: Anatomy and Growth
True lilies grow from a scaly bulb — a distinctive structure with no papery outer covering (the technical term for that paper is a tunic; lily bulbs lack one). The overlapping fleshy scales can be pulled apart like a loosely packed artichoke. Plant them 8 inches deep in fall, with the growing point facing upward, and the single stem that emerges in spring will carry leaves all the way up its length and flowers at the top.
According to NC State Extension, Lilium encompasses over 100 species native mostly to temperate regions of the Northern Hemisphere, hardy in USDA zones 3a–8b depending on the type. The genus contains several major horticultural groups worth distinguishing, because they differ significantly in height, fragrance, and growing requirements:
- Asiatic hybrids — 18 to 24 inches tall, bloom in early summer (right after peonies), upward-facing flowers in bold colors, no fragrance, zones 4–8. The easiest type to grow.
- Oriental hybrids — 3 to 4 feet tall, bloom in late summer, intensely fragrant, large star-shaped flowers up to 10 inches across, zones 5–9. The ones people think of when they picture a florist lily.
- Trumpet lilies — 5 to 6 feet tall, bloom midsummer, intensely fragrant with thick waxy petals, up to a dozen flowers per stem, zones 4–8. Require staking in most gardens.
- OT hybrids (Orienpets) — cross between Oriental and Trumpet; 3 to 4 feet, zones 4–9, strong fragrance, rarely need staking. Best option when you want the Oriental look with better weather tolerance.
Because true lilies grow from bulbs rather than rhizomes, they do not form spreading clumps the way daylilies do. They stay in place and multiply slowly by producing bulblets alongside the parent bulb over several years. True lilies also make excellent cut flowers — the stems last a week or more in a vase, which is why florists reach for them. Daylily scapes collapse within hours of cutting.
For a deeper look at using true lilies in arrangements alongside other long-lasting stems, see our cut flower growing guide.
Care Differences That Actually Matter
Both plants tolerate a wide range of conditions, but they fail for different reasons. Knowing the difference keeps you from treating one plant the way the other needs to be managed.
Planting: Daylilies go in as fans (a clump of roots with foliage attached), with the crown at or just below soil level. True lily bulbs are planted 8 inches deep in fall — significantly deeper than tulip or daffodil bulbs. The depth is not arbitrary: it insulates the bulb from temperature swings and keeps the stem stable as it grows. Planting a lily bulb too shallow results in a floppy plant that tips over by July.
Soil: Daylilies are remarkably forgiving — they tolerate clay, poor soil, and drought once established, according to the RHS growing guide. What they cannot tolerate is waterlogging. True lilies demand well-drained, fertile, slightly acidic soil (below pH 6.0 according to NC State Extension) and consistent moisture. A lily bulb sitting in wet soil will rot within weeks. If your drainage is marginal, plant daylilies; if your soil is well-prepared and you can maintain moisture without waterlogging, lilies reward the effort.
Water: Once established, daylilies manage drought on their own through extensive root systems. Water them during planting and through their first season; after that, supplemental irrigation is optional in most climates. True lilies need consistent moisture throughout the growing season, particularly while the bulb is building energy reserves after bloom. Mulch helps hold soil moisture and keeps the root zone cool, which true lilies need — they prefer shaded roots even while their top growth is in full sun.
Division: Daylilies benefit from division every three to four years, according to the RHS. As the clump expands, the center becomes crowded and bloom quality drops. Dividing in early spring or early fall reinvigorates the plant and creates new fans for other parts of the garden. True lilies do not need division — they spread slowly and prefer to be left undisturbed for years at a time.
Staking: Daylilies (under 3 feet) almost never need staking. Trumpet lilies (5 to 6 feet) almost always do, especially in windy sites or after heavy rain. Oriental hybrids are borderline — stake them in exposed positions. Asiatic hybrids and OT hybrids at 3 to 4 feet rarely need support if given enough sun to grow stocky stems.
Both plants attract pollinators, particularly bees and hummingbirds. If pollinator support is a primary goal, daylilies offer a longer combined bloom season across early, mid, and late-season cultivars. For planning a garden that feeds pollinators from spring through fall, our pollinator garden hub has planting guides by bloom season.
Pet Safety: The Distinction That Could Save a Cat’s Life
Both daylilies and true lilies are toxic to cats, and both can cause acute kidney failure. This is not a distinction where one plant is “a bit toxic” and the other is “very toxic” — both are in the same danger category for felines. According to the ASPCA, even a small amount of leaf, flower, or pollen, or drinking water from a vase containing either plant, can trigger kidney failure in a cat within 24 to 72 hours.
The critical fact that almost no comparison article mentions: the toxin responsible has never been identified. Purdue University’s College of Veterinary Medicine reports the FDA statement directly: “The toxin, which only affects cats, has not been identified.” Decades of veterinary research have documented the kidney failure with precision, but the underlying compound causing it remains unknown. The practical implication is that there is no antidote — treatment is supportive care, and it must begin within 18 hours of ingestion to prevent permanent kidney damage, according to the ASPCA.
Here is where the two plants diverge for dog owners: daylilies are significantly less dangerous for dogs. NC State Extension notes that daylilies are toxic to cats but does not list them as a dog concern beyond mild gastrointestinal upset. True lilies are also less severe in dogs than in cats — dogs may vomit or show lethargy, but kidney failure is not the expected outcome. The ASPCA notes that the effects are “much more severe in cats” for both plant types.
For cat owners, neither plant should be in the home or in gardens where cats roam freely. For dog-only households, daylilies carry minimal risk. For households with no pets, the choice is entirely aesthetic and cultural.
One final contrast worth noting: while true lily flowers are toxic, daylily flowers — as mentioned above — are edible for humans. The same plant that kills cats can be eaten by people. This is not a confusion you want to mix up in either direction.
Which Should You Plant?
The answer depends on what you actually need from the plant.
Choose daylilies if: You want a low-maintenance perennial that spreads into a reliable clump, tolerates neglect, drought, and imperfect soil, blooms over a long season, and costs little to fill large spaces. Daylilies are the better choice for mass planting, slopes, hell-strips, and anywhere you want color without irrigation infrastructure. Their zones 3a–9b range also makes them more widely adaptable than most true lilies.
Choose true lilies if: You want tall, dramatic flowers with significant fragrance, elegant stems for cutting, or the formal look of an upright flowering bulb in a mixed border. Asiatic hybrids are the easiest entry point and perform well in zones 4–8. Oriental hybrids deliver the strongest fragrance for late summer. If you have well-drained, fertile soil and can maintain consistent moisture, true lilies repay the effort with blooms that are genuinely hard to replicate with any other plant.
Choose both if: You want continuous color from early summer through early fall. Asiatics open in June, daylilies carry July and August, and late Orientals or OT hybrids close out the season in August and September. Planted together with some planning, the two genera cover the full summer with almost no overlap in their bloom windows. The contrast between the tall, formal lily and the loose, grassy daylily also works well aesthetically in cottage or informal garden styles.
For ideas on combining both with other summer plants, see our article on cottage garden flowers.
Frequently Asked Questions
Can I plant daylilies and true lilies in the same bed?
Yes. They have compatible light and drainage requirements, bloom at slightly different times, and contrast well visually. Space true lily bulbs away from the center of daylily clumps so division work does not disturb the bulbs.
Are daylilies actually deer-resistant?
No. Despite common advice suggesting otherwise, NC State Extension lists daylilies as “frequently damaged” by deer. If deer pressure is a problem in your garden, daylilies are not a reliable solution. True lilies are similarly unprotected.
My daylily blooms are distorted and never fully open. What is happening?
In the UK, this is likely hemerocallis gall midge — larvae that feed inside developing buds, causing them to swell and abort before opening. The RHS recommends removing and disposing of affected buds (not composting them) to reduce the larval population over time. This pest is not yet widespread in North America but has been spreading.
Do true lily bulbs need to come up in winter like tulips?
No. True lily bulbs are fully hardy in zones 3a–8b and can remain in the ground year-round. Unlike some tender bulbs, they do not require lifting. In zones 9 and warmer, they may struggle with insufficient winter chilling.
Sources
- NC State Extension Gardener Plant Toolbox — Hemerocallis: https://plants.ces.ncsu.edu/plants/hemerocallis/
- NC State Extension Gardener Plant Toolbox — Lilium: https://plants.ces.ncsu.edu/plants/lilium/
- Lincoln County UGA Extension — Plant Spotlight: Lilies and Daylilies: https://site.extension.uga.edu/lincoln/plant-spotlight-lilies-and-daylilies/
- Wikipedia — Daylily: https://en.wikipedia.org/wiki/Daylily
- ASPCA — Which Lilies Are Toxic to Pets?: https://www.aspca.org/news/which-lilies-are-toxic-pets
- Purdue University College of Veterinary Medicine — Beautiful Spring Lilies Pose Serious Danger to Cats: https://vet.purdue.edu/news/beautiful-spring-lilies-pose-serious-danger-to-cats.php
- RHS — How to Grow Hemerocallis: https://www.rhs.org.uk/plants/hemerocallis/growing-guide
- Longfield Gardens — Types of Lilies: Asiatics, Orientals, Trumpets and More: https://www.longfield-gardens.com/a/blog/know-your-lilies-asiatics-orientals-trumpets-and-more
