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Sister Theresa Hydrangea
'Sister Theresa' is a wonderful heirloom that produces large, spherical clusters of pristine white flowers, even in full shade. More details below!

Sister Theresa Hydrangea

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Sister Theresa Hydrangea
Hydrangea macrophylla  'Sister Theresa'

USDA Plant Hardiness Zones: 6a-9b  Find Your Zone > 

Note:  For our customers who live and garden north of USDA Cold Hardiness Zone 6a, where this Hydrangea is not winter hardy, you'll be happy to know that it can be grown in containers that can be brought indoors during winter and place back outside when temperatures warm up in spring.

Special Attributes

Bred in 1947 and originally named 'Petite Soeur Therese De L'enfant Jesus' (Whew!...that's a long name!), 'Sister Theresa' is a wonderful heirloom that produces large, spherical clusters of pristine white flowers, even in full shade. The purity of the white is stunning with no pink or cream. That said, the flowers fade to an attractive pale green with mauve-pink overtones. The flowers are quite large and the individual sepals are very big making the blooms more striking, and perfect for long-lasting cut flowers. An outstanding landscape shrub for border edges, containers, and foundation plantings in partial to full shade.

Landscape & Garden Uses

Growing naturally 4-5 feet tall and 4-6 feet wide in a rounded mound, Sister Theresa Hydrangea can be grown in garden beds or containers. It is ideal for use as a specimen or accent in home foundation plantings, flowering shrub borders and perennial gardens. In larger landscape spaces it is especially dramatic in small to large groupings or in straight or staggered rows as a colorful hedge.

Spacing:  3-4' for solid hedge; 8' or more for space between plants

Cultural Preferences

Sister Theresa Hydrangea prefers full sun in northern zones and some afternoon shade or filtered sun the farther south you go. Adapts to various soil stypes however prefers a well-drained moist, loamy soil. Not too wet though...Hydrangea don't like constantly soggy soil. This mophead blooms on old wood so should be pruned right after they bloom, when the blooms have faded. Reach down into the bush and cut off the stems to about a foot high, right above a bud. USDA Zones: 6a-9b  Find Your Zone >

Note:  Sister Theresa is a Hydrangea macrophylla species that produces its flowers from buds that formed on "old wood" (during the previous year). This means that even though it is tempting to cut them back in the winter, when they are only bare sticks jutting out of the ground, don't do it. The flower buds are already formed and hidden in those bare sticks, so don't cut them off if you want flowers.

Get tips for proper pruning time and technique in our article titled How To Prune Various Types Of Hydrangea 

Helpful Articles

Click on the link(s) below to get advice from our experts on how to plant, fertilize, prune and water Hydrangea shrubs...

Plant Details

USDA Plant Hardiness Zones: 6a-9b  Find Your Zone >
Plant Type:  Deciduous Flowering Shrub
Height at Maturity:  4-5'
Width at Maturity: 4-6'
Spacing:  3-4' for solid hedge; 8' or more for space between plants
Growth Habit / Form:  Bushy, Dense, Globose/Round, Mounding
Flower Color:  White
Flower Size:  Large - Up to 6-8"
Flowering Period:  Summer
Flower Type:  Single in large clusters
Fragrant Flowers:  No
Foliage Color:  Green
Fragrant Foliage:  No
Berries:  NA
Berry Color:  NA
Sun Needs:  Part Shade (South) - Sun or Part Shade (North)
Water Needs:  Average, Lower when established
Soil Type:  Clay (amended), Loam, Sand (amended), Silt 
Soil Moisture / Drainage:  Well Drained Moist
Soil pH:  6.0 - 8.0 (Moderately Acid to Moderately Alkaline)
Maintenance / Care:  Low
Attracts:  Visual Attention
Resistances:  Deer, Disease, Drought (when established in part shade), Heat, Humidity, Insect

Plant Long & Prosper!

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