April 1, 2023
How to Grow and Care for Andromeda Shrubs
Japanese Andromeda (Piers japonica)
All About Andromeda
One of the earliest shrubs to bloom in the spring, Andromeda offers an elegant flower form that merits close inspection. Individual flowers may remind you of lily of the valley, but rather than one individual flower, they are grouped in large clusters that hang down from the tiered branches, each cluster up to 6” long. Often fragrant, they shimmer in the early spring landscape. Flowers may be white, pink or deep rose, depending on the variety.
Native to the mountain regions of the Far East, Pieris japonica is wonderfully hardy in our area. It is a shrub with four seasons of interest. Glossy dark green leaves remain evergreen all year and for that reason alone, it merits inclusion in our gardens. But there is an added foliar element – new leaves emerge as the flowering cycle is coming to an end and are bronze to red in color. The contrast is eye-catching. As the colorful new leaves turn dark green, buds for next year’s flowers are forming. The buds are bead-like and showy, rather like having jewelry on your shrub! The buds’ summer show continues throughout the winter, adding interest and contrast to the evergreen foliage.
Landscaping Andromeda
Andromeda is an excellent companion for Rhododendrons and Azaleas, as they grow in similar conditions. They are ideal for use in foundation plantings, woodland edges and mixed borders. We are perhaps most familiar with the 3’-5’ tall, mid-sized varieties, but there are excellent low-growing varieties for the front of the border, and even dwarf varieties under 2’ tall, which can be grown in containers. Versatile, they will grow in light conditions ranging from sun to partial shade to full shade. If grown in full sun, they will be happiest with some afternoon shade. And no matter the light conditions, they do appreciate protection from the drying effects of winter winds and sun. They like the acidic nature of our New England soils, and to look their best, they prefer that soil to be rich in organic matter.
Deer resistant, they are also a favorite and important food source for our native pollinator, the mason bee.
Growing and Caring for Andromeda Shrubs
If you’ve ever admired Andromeda in early spring and thought, I need that in my yard, the good news is it’s not a fussy plant — as long as you give it what it loves.
First and most important: soil. Andromeda (Pieris japonica) thrives in acidic, well-drained soil, very similar to what Rhododendrons and Azaleas prefer. If your soil is heavy clay, amend it generously with compost, pine bark, or leaf mold before planting. Rich organic matter improves drainage while keeping the root zone cool and evenly moist — exactly what this shrub wants.
When planting, choose a spot protected from harsh winter winds. Winter burn is one of the few issues Andromeda may experience, especially in exposed locations. A woodland edge, the north or east side of a home, or a sheltered border works beautifully. Morning sun with afternoon shade is ideal. Too much hot afternoon sun can stress the foliage, while deep shade may reduce flowering.
Watering is especially important during the first year. Keep the soil consistently moist but never soggy. Once established, Andromeda is relatively low maintenance, but it does not tolerate drought well. A 2–3 inch layer of mulch (pine needles or shredded bark are perfect) helps retain moisture and maintain soil acidity.
Feeding is simple. In early spring, apply a fertilizer formulated for acid-loving plants. Avoid over-fertilizing, which can encourage excessive leafy growth at the expense of flowers.
Pruning is rarely needed. If shaping is necessary, do so immediately after flowering, before next year’s buds begin forming in summer. Removing spent flower clusters can tidy the plant, but it’s not required.
With proper placement and care, Andromeda rewards you year after year — evergreen structure in winter, jewel-like buds through the cold months, and those breathtaking cascading blooms that truly announce spring has arrived.
Types of Andromeda Varieties
Pieris japonica ‘Compacta’
As the name suggests, this variety is somewhat smaller than traditional varieties of Andromeda. It grows to a height of 4’. As well, the leaves are slightly smaller than traditional varieties. It flowers heavily with trusses of white, bell-like flowers that are lightly fragrant. After the flowers fade, new foliage emerges and is flushed with red-bronze tones. As this new foliage matures it becomes a lovely shiny, deep green.
Pieris japonica ‘Dorothy Wycoff’
‘Dorothy Wycoff’ is a beautiful variety, admired for its year round interest. It features dark red winter flower buds which open to reveal white flowers with a soft pink tone. The foliage is glossy and dark green in summer, turning mahogany-red in winter. This shrub will reach a height of 5’ in 10 years.
Pieris japonica ‘Katsura’
‘Katsura’ is a lovely plant with arching trusses of rich rose- pink, bell-shaped flowers that appear in early spring. A distinguishing feature of this variety is that new foliage emerges not just in spring, but into summer, offering a particularly long season to enjoy the dramatic, glossy, wine-red color of new growth. In 10 years, ‘Katsura’ will reach a height of 5’ and a similar width.
Pieris japonica ‘Little Heath’
‘Little Heath’, as the name suggests, is smaller than many Andromedas, growing 2’-3’ high and wide at maturity. Pendulous white bell-shaped flowers appear in early spring. Unusual for Andromeda, ‘Little Heath’ has variegated foliage – each leaf is outlined in cream. New foliage emerges with bronze- red colored tones. It performs well in the ground and is also suitable for container planting.
Pieris japonica ‘Mountain Fire’
‘Mountain Fire’ is a showy and dramatic Andromeda, noted for its spectacular brilliant red new growth which remains on display for several weeks. No muted bronze tones for this variety. ‘Mountain Fire’ has lovely clusters of fragrant white flowers. It will grow slowly to a height of 6’ and a similar width.
Pieris japonica ‘Scarlet O’Hara’
Another Andromeda with lovely bronze-red new growth, ‘Scarlet O’Hara’ is notable for its relatively early and profuse bloom. Clusters of pink buds open to fragrant white flowers. Leaves mature to glossy dark green on lovely red stems. More narrow than many Andromeda, ‘Scarlett O’Hara’ will grow to a height of 6’-8’ and a width of 4’-6’ in 10 years.
Pieris japonica var. yakushimanum ‘Cavatine’
This hardy, slow growing Andromeda is increasingly popular. It has small leaves and grows as a dense, compact mound only 2’ tall and a bit wider in 10 years. Trusses of white flowers open slightly later in spring than other varieties and are particularly fragrant and long lasting. This variety is well suited to the smaller garden. It can be used in a foundation planting or mixed border, and is particularly attractive when used to line a walkway.
Pieris japonica var. yakushimanum ‘Prelude’
‘Prelude’ is similar to ‘Cavatine’ with the same low, mounding shape. Flower buds are pink, opening to long lasting, delicate white blooms. Emerging foliage has a pinkish tint before maturing to rich dark green.
Pieris x ‘Brouwer’s Beauty’
Developed in Connecticut, ‘Brouwer’s Beauty’ is a cross between Pieris japonica and our native Pieris floribunda. The result is a beautiful shrub with purple-red winter buds which open to an abundant display of slightly fragrant white, bell-shaped flowers that are upright and slightly arching. New spring foliage is yellow-green, maturing to shiny dark green in summer and bronze in winter. The rich winter foliage complements the deep red flower buds, creating winter interest in the garden. Very hardy, it is slow growing, forming a dense shrub 5’-6’ tall and 3’-4’ wide in 10 years. This variety was a Cary Award winter in 2000, signifying its outstanding garden performance in our region.
Andromeda Shrubs FAQ
What are Andromeda shrubs?
Andromeda shrubs are evergreen plants in the Pieris genus, commonly known as Pieris or lily-of-the-valley shrub. They are valued for their glossy green foliage, cascading clusters of bell-shaped blooms, and colorful new growth that often emerges in shades of red or bronze.
When do Andromeda shrubs bloom?
Andromeda shrubs typically bloom in early to mid-spring. The flowering display can last several weeks, and many varieties also offer attractive foliage interest year-round.
Where do Andromeda shrubs grow best?
Andromeda shrubs grow best in partial shade with well-draining, acidic soil. They thrive in cool to moderate climates and are well suited for woodland gardens, foundation plantings, and shaded landscape borders.
How do you care for Andromeda shrubs?
To care for Andromeda shrubs, keep the soil consistently moist but not waterlogged, mulch to protect shallow roots, and apply an acidic fertilizer in early spring. Prune lightly after flowering to maintain shape and encourage healthy growth.
Are Andromeda shrubs toxic?
Yes. All parts of Andromeda shrubs contain grayanotoxins, which are toxic to humans and animals if ingested. Plant them away from areas where pets or livestock may have access.