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Henry™ III Purple Aster

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  • Full Sun (At Least 6 Hours Of Direct Sunlight)
  • Mature Height 18 Inches
  • Mature Spread 24 Inches
  • Growing Zones 5 - 9
  • Use As A Filler In Containers

Aster is a tried and true star of the late summer and fall garden. Henry™ III Purple Aster sports a fully double flower in lavender shades, providing a fresh shot of color late in the season. The luscious lavender flowers combined with deep green foliage are sure to attract butterflies, hummingbirds, and songbirds even after the first light frosts of fall. Aster novi-belgii is also commonly known as Michaelmas Daisy or New York Aster and is native to the East Coast of North America from Nova Scotia to South Carolina. Henry™ III Purple Aster is a cultivar bred specifically for the home garden. 

Asters are tough and dependable bloomers that can tolerate a wide range of climates from zones 5a-9b. Herbaceous perennials like the Henry™ series of asters have a relatively short period of flowering, although this one likes to wait until the end of summer to show color. The green foliage can help fill the spaces in a perennial border full of early blooming plants. Plant asters at the edges of a woodland garden, in a meadow setting, or alongside rock garden specimens to provide color late in the season. 

Henry™ III Purple Aster Care

Plant Asters where they will receive at least 6 hours of direct sun. The soil type can be anything from heavy clay to light sand, as long as it drains well. Heavy fertilizing is not necessary to encourage profuse blooming. Consistent watering is key to helping this perennial establish and develop a strong root system. Mulch yearly with organic compost or another organic material to aid in moisture retention and suppress annual weeds. 

Deadheading is not required for Henry™ III Asters. The smallish flowers cover every inch of the plant when in full bloom and are generally self-cleaning. This cultivar does not produce much seed, and any unwanted seedlings can be easily pulled as they emerge in spring. Cut back the spent top growth in late winter or early spring, so that wildlife can feed on any seeds and use the foliage as shelter over the winter. 

Divide plant clumps every 3-4 years or as necessary to keep the plants growing vigorously. Asters spread by underground rhizomes and spread out from the middle of the plant, often leaving the middle section bare or sparse looking. Dividing and replanting will keep plants full and dense and flowering at their best. 

Henry™ III Purple Aster Spacing

The smaller size of Henry III Purple Aster makes it easy to add to established plantings or a container at the end of summer. Space plants 18 inches apart when creating a ground cover or mass planting. Increase the spacing to 24 inches when planting near other established perennials or shrubs.

Henry™ III Purple Aster Information

USDA Hardiness Zones: 5 - 9
Plant Type: Perennials
Light Exposure: Full Sun (At Least 6 Hours Of Direct Sunlight)
Mature Height: 18 Inches
Mature Spread: 24 Inches
Spacing: 24 Inches
Habit: Mounded
Flower Color(s): Purple
Flower Description: Purple Shades
Bloom Period: Summer to Fall
Foliage Type: Herbaceous
Foliage Color(s): Green
Foliage Description: Green Shades
Seasonal Interest: Summer Flowering, Fall Flowering, Fall Interest
Watering: Average
Resists: Deer, Rabbit
Tolerates: N/A
Attracts: Bees, Butterflies
Container Role: Filler
Uses: Containers
Features: Attracts Pollinators
Common Name: Henry III Purple Aster
Other Name(s): New York Aster
Scientific Name: Aster novi-belgii 'III Purple'

Container Sizes

Please Note: The pictures below are to give a general representation of the different container sizes. The actual size/ages of plants are estimates and will vary based on; type of plant, time of year, last pruning & many other factors.

4.5 Pot

4.5" Pot
 Also Known As:
   4.5" Container

 Plant Age:
   ~ 6 months
 Plant Size:
   ~ 3"-6"
 Pot Size:
   ~ 4.5"H x 3.75"W
   1.42 quarts

Quart Pot

Quart Pot
 Also Known As:

 Plant Age:
   ~ 6 months - 1 year
 Plant Size:
   ~ 4"-8"
 Pot Size:
   ~ 4.75"H x 4.5"W
   1.50 quarts

2.5 Quart

2.5 Quart
 Also Known As:
   2.5 Quart Pot

 Plant Age:
   ~ 1.5 - 2 years old
 Plant Size:
   ~ 8"-12"
 Pot Size:
   ~ 6.5"H x 6.5"W
   2.20-2.30 quarts

#1 Pot

#1 Pot
 Also Known As:
   #1 Container
    1 Gallon
 Plant Age:
   ~ 1.5 - 2 years old
 Plant Size:
   ~ 10"-14"
 Pot Size:
   ~ 7"H x 7.75"W
   2.26-3.73 quarts

#2 Pot

#2 Pot
 Also Known As:
   #2 Container
    2 Gallon
 Plant Age:
   ~ 1.5 - 3 years old
 Plant Size:
   ~ 12"-18"
 Pot Size:
   ~ 9.5"H x 9.5"W
   1.19-1.76 gallons

#3 Pot

#3 Pot
 Also Known As:
   #3 Container
    3 Gallon
 Plant Age:
   ~ 2 - 4 years old
 Plant Size:
   ~ 12"-30"
 Pot Size:
   ~9.5"H x 11"W
   2.32-2.76 gallons

For more detailed information, please click here.

Plant Addicts Guarantee (Included On All Plant Orders)

Plant Addicts always guarantees your plant(s) will arrive happy & healthy. However, plant(s) are being shipped through the mail & sometimes 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 more information on how to care for your new plants, please click on our guide below.

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 a new gardener or an expert. There are many variables outside of anyone's control that can cause a plant to die. Hungry animals, drought, poor soil conditions, over watering, diseases & pests are all good examples of what can cause plants to die. The Plant Addicts Warranty is a 1 year warranty protecting you from all of the unknowns and will replace your plant if something were to happen to it.

The warranty is purchased on a per plant basis and must be purchased at the same time as the plant(s). We will cover 100% of the price of the plant, but the warranty does not cover shipping costs. SImply let us know if your plant has died within 1 year of receiving it and we will get you a new one shipped out as soon as possible (depending on the time of the year and availability). We may ask for photos for documentation purposes, but we try to make the process as easy as possible.

For more information, please click on our page below.

Guarantee and Warranty

Plant Shipping

Below are some factors we consider when determining when to ship the plants depending on the timing of the order.

Winter to Early Spring

We ship only when it's warm enough to plant in your growing zone.
Sometimes plants aren't completely ready to sell and ship in early spring. We will wait until the plants are ready before shipping so you don't get a subpar product.
For Southern plants we will be able to ship much earlier than plants coming from our northern nursery.


If there is extreme heat we may delay shipping for a week or several weeks.
We review what areas the plants are traveling through as well as your location.

Fall into Winter

We’ll ship plants out all the way up to the end of the fall planting season!


Get your order in early to reserve your plants for Spring planting!

Once your plant is shipped you’ll receive an automated email with tracking information. 

Click here for more detailed shipping information.

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