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Blue Cassel Hydrangea
Blue Cassel Hydrangea features periwinkle blue lacecap flowers from early summer through late fall on sturdy stems that are rose colored at the ends. In our gardens the flowers are more purple than blue, however this is most likely due to soil pH. But we love the purple! Blooming on both old and new growth this one repeats well for throughout the season. Get all the details below

Blue Cassel Hydrangea

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Product Number: 873-2
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Blue Cassel Hydrangea
Hydrangea macrophylla 'Blue Casse/'

USDA Plant Hardiness Zones: 5a-9b  Find Your Zone

Note: For our customers who live and garden north of USDA Cold Hardiness Zone 5a, 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

Blue Cassel Hydrangea features periwinkle blue lacecap flowers from early summer through late fall on sturdy stems that are rose colored at the ends. In our gardens the flowers are more purple than blue, however this is most likely due to soil pH. But we love the purple! Blooming on both old and new growth this one repeats well for throughout the season. Forest green foliage is a nice backdrop for the stunning flowers, which are excellent for cutting. Aluminum sulfate can be applied for more blue flowers and pelletized lime for pink flowers.



Landscape & Garden Uses

Growing naturally 4-5 feet tall and 4-5 feet wide in a rounded mound, Cassel Blue 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 hedges;  8' or more for space between plants




Cultural Preferences

Cassel Blue Hydrangea is very easy to grow in most any moist but well-drained soil with average fertility and full sun to part shade in northern zones and part shade (morning sun with afternoon shade or filtered sun) in southern zones. For best flowering, we suggest 4 hours of direct sun light per day. As with so many other ornamental plants, a constantly soggy or wet soil is problematic. Flower color is your choice. Acidic soils will make blue flowers while a neutral to slightly alkaline soil will make pink flowers.

Note:  'Cassel Blue' is a reblooming Hydrangea macrophylla species that flowers on both new and old wood. Prune as you would an Endless Summer Hydrangea

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



Helpful Articles

Click on a link below to get helpful advice from our experts on how to plant and care for mophead Hydrangeas.






Plant Details

USDA Plant Hardiness Zones: 5a-9b  Find Your Zone
Shrub Type:  Deciduous Flowering Shrub
Height at Maturity:  3-5'
Width at Maturity: 4-6'
Growth Habit / Form:  Bushy, Dense, Globose/Round, Mounding
Flower Color:  Blue to Purple in acid soil, Pink in alkaline soil
Flower Size:  Large - up to 6" inch diameter
Flowering Period:  Spring to Late Fall!
Flower Type:  Lacecap
Fragrant Flowers:  No
Foliage Color:  Dark Green
Fragrant Foliage:  No
Berries:  NA
Berry Color:  NA
Sun Needs:  Part Shade, Morning Sun, Filtered Sun (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 - 8.5 (Moderately Acid to Moderately Alkaline)
Maintenance / Care:  Low
Attracts:  Visual Attention
Resistances:  Disease, Drought (when established in part shade), Heat, Humidity, Insect



Plant Long & Prosper!

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