The Stargazer lily (Lilium orientalis ‘Stargazer’) is a celebrated hybrid known for its striking visual impact and powerful, spicy perfume. Developed in 1974, this member of the Oriental lily group quickly became a fixture in gardens and floral arrangements. Its defining trait is the upward-facing nature of its large, crimson-flecked blooms, which inspired its name. This visual appeal, combined with its straightforward cultivation, makes it a popular perennial choice for a dramatic mid-to-late summer display.
Standard Mature Height
A Stargazer lily generally reaches a mature height between 30 to 48 inches (2.5 to 4 feet, or 75 to 120 centimeters). While this is the typical range, some specimens can grow even taller, occasionally reaching up to 5 or 6 feet under optimal growing conditions. This mature stature is usually achieved rapidly, with the plant reaching its full height and blooming in its first full growing season after planting the bulb.
The plant’s spread is comparatively narrow, typically measuring only 8 to 14 inches wide. This columnar, upright growth habit allows multiple bulbs to be planted relatively close together for a dense floral display. The height of the plant makes it a good candidate for the middle or back row of a garden border, where its size can serve as a focal point.
Environmental Factors Affecting Growth
The final height a Stargazer lily achieves is significantly influenced by the specific environmental conditions it receives. Sunlight is a primary factor, as the plant performs best when receiving full sun, which is at least six hours of direct light daily. Plants situated in partial shade, receiving less than the preferred light, often develop longer, thinner, and weaker stems, a condition known as “legginess,” which typically results in shorter overall growth.
The composition and quality of the soil are also major determinants of growth potential. Stargazer lilies require a well-draining medium, such as loamy or sandy soil, to prevent the underground bulb from rotting in standing water. For the most robust growth, the soil should be fertile and maintain a slightly acidic to neutral pH, ideally between 6.0 and 7.0.
These lilies are considered heavy feeders, meaning they benefit from regular nutrient supplementation, such as a balanced fertilizer application, to fuel their rapid vertical growth. Consistent moisture is necessary, especially during the active growth phase in spring and early summer. The soil should be kept uniformly moist but never waterlogged. Applying a layer of organic mulch around the base of the stems helps to retain this necessary moisture and keeps the roots cool.
Supporting the Stalks
Given the considerable height and the size of the blooms, Stargazer lilies sometimes require physical support to maintain their upright posture. While the stems are generally sturdy, environmental stresses can compromise their structural integrity. Support becomes necessary for plants grown in partial shade, which have weaker, leggier stems, or for those planted in areas exposed to strong winds.
Staking should be performed early in the season, ideally when the stems are about 12 inches tall, rather than waiting until the plant is heavy with buds and flowers. A single, strong stake, such as bamboo or a metal rod, can be inserted into the ground a few inches away from the stem.
The stem is then loosely secured to the stake using a soft tie material, often in a figure-eight pattern, to prevent chafing and allow for continued growth. Care must be taken during this process to ensure the stake does not pierce the underground bulb, which could severely damage the plant. The substantial weight of multiple large, upward-facing blossoms at the top of the stalk makes this early intervention a useful preventative measure against stem breakage.