Twilight Sky Aster (Aster oblongifolius ‘Twilight Sky’) brings dazzling fall color to the garden just when most blooms have faded. Countless periwinkle-blue, daisy-like flowers with sunny yellow centers appear in late summer through fall, creating a showy, uplifting display. This aromatic aster stands about 3 to 4 feet tall with a slightly mounded habit, perfect for adding height and textural interest at the back of borders. Unlike other late-bloomers, Twilight Sky Aster delivers a long-lasting floral performance that reliably draws pollinators, offering a welcome food source late in the season.
Beyond its stunning blossoms, Twilight Sky Aster proves resilient and hardy. Native to North America, it tolerates hot summers, dry soil, and minimal care once established. Its fragrant foliage resists deer and common garden pests, reducing maintenance concerns. Use this versatile plant in mass plantings, as a bright border feature, or even in low-maintenance rock gardens. It also looks attractive in containers, bringing late-season color to patios and balconies.
Twilight Sky Aster Care
Select a sunny location with well-drained, average soil for optimal growth and flowering. Twilight Sky Aster thrives in full sun, though it can tolerate light shade. Water regularly during the first growing season to help roots establish, then reduce watering as the plant matures. A balanced, slow-release fertilizer in early spring supports healthy foliage and abundant blooms. Mulching around the base helps retain moisture and keep roots cool during warm weather.
Pinching back the plant in early summer encourages a bushier shape and may prevent flopping later in the season. After the main bloom period, consider shearing off spent flowers to neaten the appearance and possibly promote a second, lighter flush of blooms. In colder regions, leaving some spent stems over winter can help insulate the plant’s crown. Container-grown plants may require occasional root pruning or repotting to maintain vigor.
Twilight Sky Aster Spacing
Space individual plants about 24 inches apart for borders or mixed plantings to allow adequate airflow and room to spread. For mass plantings or informal groupings, decrease spacing to 12-18 inches to create a dense, uniform display. When growing in containers, select a pot at least 12 inches in diameter to support root growth and prevent overcrowding.
- SKU:
- 1231021603-pc
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
Also Known As:
4.5" Container
Plant Age:
~ 6 months
Plant Size:
~ 3"-6"
Pot Size:
~ 4.5"H x 3.75"W
Volume:
1.42 quarts
Quart Pot
Also Known As:
Quart
Plant Age:
~ 6 months - 1 year
Plant Size:
~ 4"-8"
Pot Size:
~ 4.75"H x 4.5"W
Volume:
1.50 quarts
2.5 Quart
Also Known As:
2.5 Quart Pot
Plant Age:
~ 1 - 2 years old
Plant Size:
~ 8"-12"
Pot Size:
~ 6.5"H x 6.5"W
Volume:
2.20-2.30 quarts
#1 Pot
Also Known As:
#1 Container
1 Gallon
Plant Age:
~ 1 - 2 years old
Plant Size:
~ 10"-14"
Pot Size:
~ 7"H x 7.75"W
Volume:
2.26-3.73 quarts
#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
Volume:
1.19-1.76 gallons
#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
Volume:
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.
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.
Summer
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!
Winter
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