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Summer Sparkler™ Summersweet

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  • Full Shade to Full Sun (Can Grow In Most Sunlight Conditions)
  • Mature Height 3 - 4 Feet
  • Mature Spread 3 - 4 Feet
  • Growing Zones 4 - 8

Summer Sparkler Summersweet, Summer Sweet, Einstein Summersweet, Novacleein, or Clethra Alnifolia, is a compact, heavy-blooming, deciduous shrub packed with 12-inch floriferous spires of twisted, fragrant blooms, reminiscent of Albert Einstein’s trademark hair. These racemes, that bloom in spades during the early to midsummer, are bursting with tiny white flowers which have a spicy, intoxicating aroma. Summer Sparkler Summersweet grows to a height of 3 to 4 feet with a spread of 3 to 4 feet and is named for the fluttering lights of sparkler fireworks. This variety of summersweet offers seasonal interest with glossy, green leaves appearing in late spring. 

Native to the United States, the Summer Sparkler Summersweet has dense, compact branches that form a soft mound. The snow-white flowers of this summersweet are an important summer source of nectar to critical pollinators, and attract butterflies and hummingbirds. It makes an excellent groundcover and is deer and critter resistant. Summer Sparkler is an excellent, hardy option for shady areas, and it is tolerant of wet and salty sites.

Summer Sparkler Summersweet Care

The Summer Sparkler Summersweet performs best in partial sun, but can adapt to both full sun and dappled shade. The best type of soil for your Summer Sparkler Summersweet is organic, slightly acidic, and well-drained, but it can thrive in many types of soil. It will need regular watering to thrive, especially while it establishes. 

To prune your Summer Sparkler Summersweet, cut old wood from the base in the late winter or early spring before new growth begins. It should be fertilized yearly in the early spring.

Summer Sparkler Summersweet Spacing

The Summer Sparkler Summersweet should be spaced 4 to 6 apart at planting. They make a great single specimen accent, or you can plant it en masse. Summer Sparkler is an excellent option grown anywhere you can enjoy its spicy, clove-like fragrance. It also makes a beautiful addition to a mixed shrub border.

Summer Sparkler Summersweet Information

USDA Hardiness Zones: 4 - 8
Plant Type: Bushes
Light Exposure: Full Shade to Full Sun
Mature Height: 3 - 4 Feet
Mature Spread: 3 - 4 Feet
Spacing: 3 - 4 Feet
Habit: Upright
Flower Color(s): Pink, White
Flower Description:
Bloom Period:
Foliage Type: Evergreen
Foliage Color(s): Green
Foliage Description:
Seasonal Interest: Summer Flowering
Watering: Average
Resists: Deer, Rabbit
Tolerates: Drought
Attracts: Bees, Birds, Butterflies, Hummingbirds
Container Role:
Uses: Specimen or Focal Point, Wildlife Gardens
Features: Attracts Pollinators, Cut Flowers, Fragrant, Low Maintenance
Common Name: Summer Sparkler™ Summersweet
Other Name(s): Summer Sweet, Einstein Summersweet, Novaclean
Scientific Name: Clethra Alnifolia `Summer Sparkler`

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Plant Addict Guarantee (Included On All Plant Orders)

Plant Addicts guarantees your plant(s) will arrive happy and healthy, but the plant(s) are being shipped through the mail and accidents happen. If the plant is dead, has dried out roots or the incorrect item was shipped just notify Plant Addicts within 3 days upon delivery. We may ask for pictures but will try to make it as easy as possible for you. Please note plant(s) with damaged branches or wilted leaves will not qualify for this guarantee. Plants are very resilient and will rebound quickly when cared for correctly.

For information on how to care for you new plant please check out our guide. Guide: How to Care for Your New Plant(s)

Plant Addicts Warranty - 1 Year (Extra Purchase Required)

We encourage all plant lovers to purchase the Plant Addicts Warranty whether you’re new or an expert. There are many variables outside our control and yours that can cause the demise of your plant(s). Examples would be hungry animals, drought, poor soil conditions, over watering, disease, insects & many other factors. The Plant Addicts Warranty is a 1 year warranty protecting you from all the unknowns and will replace your plant if it moves on to the plant afterlife.

The warranty is purchased on a per plant basis and must be purchased at the same time as the plant purchase. We will cover 100% of the price of the plant but the warranty does not cover shipping cost. Simply let us know if your plant has died within one year of receiving it and we’ll get you a new one shipped out. We may ask for photos for documentation purposes but again we’ll try to make it as easy as possible.

For more information, please go to our Shipping & Returns page at the bottom of the website.

Guide: How to Care for Your New Plant(s)

Planter Shipping

Standard Colors: 2-3 business days

Special Order Colors: 8 weeks - this is due to the planter being custom made with the color(s) of your choice

Please Note: On special orders there can not be any cancellations

Plant Shipping

Time of Order:

Summer Shipping

  • If there is extreme heat we’ll delay shipping.  
    • We’ll have to review what areas the plants are traveling through along with your location

Once your plant is shipped you’ll receive an email with tracking information. Depending on the above criteria we’ll ship your plant(s) towards beginning of the following week from your order. We put together this helpful guide of what to do when you receive your plants in the mail.

It is important to know that all of our plants are clearly labeled for which growing zones the plant can survive in. The plants are thoroughly trialed and tested in every growing zone before we state the plant can grow in a zone. Again, our #1 priority is to ship the plants to you healthy and ready to thrive in your location. So we will do everything in our power to do so.