Hyperion Daylily

Hemerocallis ‘Hyperion’

Description & Overview

Hyperion Daylily is a tried-and-true selection from the 1920’s. Aptly named, this cultivar produces large, 5-inch citron-yellow flowers that reach their peak in July. The tall scapes hold the wonderfully fragrant flowers at the perfect height for summer scent!

Core Characteristics

Mature Height: 36-40 inches
Mature Spread: 18-30 inches
Growth Rate: Perennial
Growth Form: Clump forming perennial
Light Requirements: Full Sun
Site Requirements: Tolerant of many sites, best in deep, rich soils
Flower: Citron-yellow, fragrant, large
Bloom Period: July
Foliage: Green
Fall Color: Insignificant
Fruit Notes: Capsule

Suggested Uses:

Hyperion Daylily excels as a mass planting due to its height. It can even be used as an informal border between plants as its fragrant flowers easily delineate different parts of the garden. Its spreading habit also makes it useful for slopes and erosion control. In areas where few other plants tolerate poor soil and pollution, Hyperion is a clear winner.

Wildlife Value:

The large, fragrant flowers of Hyperion Daylily will attract butterflies and hummingbirds to the garden, but this plant is not significantly important to any native wildlife species.

Maintenance Tips:

The spent flowers of Hyperion Daylily can be deadheaded to keep the plant looking tidy. The dead flower stalks, called scapes, can be pulled once they’ve completely dried. In spring, the leaves and stalks of last year can be cleaned up to keep your bed tidy.

While drought tolerant, watering Hyperion Daylily during drought will keep the foliage full and attractive. In periods of low moisture, some foliage may brown out and become unattractive. These damaged parts of the plant can be removed once supplemental water has been provided.

Hyperion Daylily should be divided every 3 years in spring to improve flowering and reduce crowding. Dig up the clump, remove ½ to ¾ of the mass, and replant the remaining portion. Water well after replanting to develop a healthy, deep root system.


Daylilies are generally pest and disease free. Mites, aphids, and thrips may occur, but these problems are exceedingly rare. In general, Daylilies will be happy and healthy as long as they are able to establish and receive adequate sunlight.

The flower buds are tasty fodder for deer, especially in periods of drought when other food sources may be unavailable. If excessive browsing is problematic, a repellent spray or fence may be used to protect the flower buds.

While the Daylily Rust fungus is of concern in southern states, the fungus has not been observed to successfully survive our cold winters in the Midwest.

Leaf Lore:

Daylilies are put into one of three categories depending on their flower size; miniature daylilies, that have flowers that are 3 inches or less in size; small daylilies, which have flowers that are between 3 and 4 ½ inches; and Large daylilies, with flowers greater than 4 ½ inches in size.

Daylilies are native to Asia and Central Europe and were brought to North America as a hardy ornamental. While over 55,000 registered cultivars exist, no one has successfully created a cultivar with pure blue or white flowers. The current focus of many selection and hybridization programs is to develop cultivars with better hardiness and unique flower traits. With so many cultivars available, we try to stock only those cultivars that have proven themselves in our climate and soils.

Daylilies get their name from their flowering habit. A single flower will last one day, opening in the morning and withering at night. However, the plants produce huge quantities of flower buds and the spent flowers are quickly replaced the following day.

Companion Plants:

Hyperion Daylily pairs well with large-stature perennials like Russian Sage or False Blue Indigo. For lower perennial companions, consider using Rozanne Geranium or Strawberry Seduction Yarrow for their varied texture.

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