Smooth Blue Aster

Product Code: asmoo

Aster Smooth Blue (Aster laevis)
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Details

The Smooth Blue Aster is a native to open wooded areas or moist dry prairies. You can plant among other natives to support stems which have a tendency to flop. It has prolific powdery blue to lavender flowers add beauty from late summer into autumn. This native plant will definitely attracts birds and butterflies to you garden. And these flowers are great for flower arrangements! Mature size is around 2-4' tall and wide. Hardiness zone 4.

Planting & Care for Aster

Preparation

  • Aster grow best in full sun. They do tolerate light shade, but blooming may not be so prolific and growth will be less compact.
  • Add well-rotted organic matter to the soil. Feed and water well to counter disease.
  • Divide clumps in late winter. These plants are prolific growers. One plant will multiple itself tenfold in a season.
  • Re-plant divisions 8 inches apart. Divide plants in April and October.
  • The long flowering display lasts from late summer into early fall.
  • Cut flowers last very well if given a frequent change of water.

Opening Plant Material

  • Containers - Completely saturate all container plants by putting in a larger container of water until stops bubbling, then remove. You’re now ready to plant.
  • Scroll down to an orange rectangular box and click on “Handling & Plant Guidelines” for illustration on planting each of these types.

Planting containers

  • Plant in March, May – November.
  • Slide plant from pot by tapping on the bottom of the pot.
  • With shovel or knife trim bottom 2" off of the root ball for plants in plastic containers.
  • Rotate the plant to the proper position. Never lift or move plants by the tops.
  • Place the root ball in the hole.
  • Notice where the base of the trunk flairs out from the tree. This is called the root flair. This root flair should show when the tree is planted. If necessary, add soil under the ball so the root flair is exposed.
  • Place fertilizer packets into the bottom of the hole (if purchased). *Use Our Recommended Fertilizer.
  • Backfill the hole with soil, making sure the top of the root ball is visible and slightly higher than the soil around it.
  • Firm the soil around the plant. Water well to settle soil around the root ball.

Pruning - After Planting

  • Containers - Although it is not essential for containers to be pruned after planting, a light pruning for shape, to remove any broken branches from shipping, or to thin out a heavily branched plant will help in the transplanting process and in the appearance of your new planting.

Pruning - Through-out the Season

  • Cut off spent flower stems close to the ground level after blooming. Plants will gradually die back, but should not need more close attention until new growth appears in the next spring.

Watering - After Planting

  • Plants typically take approximately 6 weeks to establish new roots in your soil. During this period, water plants as often as every 2-4 days at the start and at least a minimum of once per week.
  • Beyond the 6 week establishment period, water once per week, unless rains occur.
  • Stick your finger into the soil around 3” to check soil moisture.

Watering - Through-out the Season

  • After the first season, plants should only be watered during extended periods without rain.
  • How do you know if your plants need water? The easiest way to tell is to touch the soil around the roots. If it is moist, there is no need to water. If it is dry, give it a good soaking with the hose end (no nozzle) watering the soil only, not the leaves.
  • Stick your finger into the soil around 3” to check soil moisture.

 

Go to our "Plant Features & Video Tab" for more information & tips on caring and maintaining this plant.

Handling & Planting Guidelines

Special Features & Videos for Aster

Special Plant Features & Tips

  • The Smooth Blue Aster is a native to open wooded areas or moist dry prairies.
  • You can plant among other natives to support stems which have a tendency to flop.
  • It has prolific powdery blue to lavender flowers add beauty from late summer into autumn.
  • This native plant will definitely attracts birds and butterflies to you garden.
  • And these flowers are great for flower arrangements!
  • Mature size is around 2-4' tall and wide.
  • Hardiness zone 4.
  • Aster grow best in full sun. They do tolerate light shade, but blooming may not be so prolific and growth will be less compact.
  • Add well-rotted organic matter to the soil. Feed and water well to counter disease.
  • Divide clumps in late winter. These plants are prolific growers. One plant will multiple itself tenfold in a season.
  • Re-plant divisions 8 inches apart. Divide plants in April and October. Transplant in May.
  • The long flowering display lasts from late summer into early fall.
  • Cut flowers last very well if given a frequent change of water.
  • Cut off spent flower stems close to the ground level after blooming. Plants will gradually die back, but should not need more close attention until new growth appears in the next spring. 

How to plant containers

 

Pruning Perennials in their Dormancy

Popular Sizes
ItemApprox. Weight (lbs.)Approx. Base DiameterApprox. HeightShipping Method
#1 Container  10 8" 10" FedEx
#3 Container/Grow Bag 25 10" 15" FedEx
2' - 5' Bare Root 5 - 35 5 - 15" 2 - 5' FedEx
Containers/Grow Bags
ItemApprox. Weight (lbs.)Approx. Base DiameterApprox. HeightShipping Method
#1 Container  10 8" 10" FedEx
#2 Container 15 12" 12" FedEx
#3 Container/Grow Bag 25 10" 15" FedEx
#5 Container/Grow Bag 40 14" 10" McKay Delivery*
#7 Container/Grow Bag 35 - 50 14 - 16" 1 - 2' McKay Delivery*
#10 Container/Grow Bag 55 - 70 18" 1 - 3' McKay Delivery*
#15 Container/Grow Bag 65 - 80 22" 2 - 3' McKay Delivery*
#20 Container/Grow Bag 100 - 160 24" 7 McKay Delivery*
#25 Container/Grow Bag 130 - 200 24 - 30" 8' McKay Delivery*
Bare Root
ItemApprox. Weight (lbs.)Approx. Base DiameterApprox. HeightShipping Method
#1 Bare Root 5 5 - 8" (no soil on roots) 5 - 10" FedEx
12" Bare Root 5 - 10 5" (no soil on roots) 10 - 12" FedEx
15" Bare Root 8 - 10 10 - 12" (no soil on roots) 12 - 15" FedEx
18" Bare Root 10 - 15 10 - 15" (no soil on roots) 15 - 18" FedEx
2' Bare Root 15 12" (no soil on roots) 2' FedEx
3' Bare Root 20 15" (no soil on roots) 3' FedEx
4' Bare Root 25 18" (no soil on roots) 4' FedEx
5' Bare Root 30 20" (no soil on roots) 5' FedEx
6' Bare Root 35 22" (no soil on roots) 6' McKay Delivery*
8' Bare Root 40 22 - 24" (no soil on roots) 8' McKay Delivery*
9' Bare Root 45 24 - 30" (no soil on roots) 9' McKay Delivery*
1 3/4" caliper Bare Root 50 30" (no soil on roots) 5 - 6' McKay Delivery*
1 1/4" caliper Bare Root 55 32" (no soil on roots) 8 - 11' McKay Delivery*
1 1/2" caliper Bare Root 60 32" (no soil on roots) 10 - 12' McKay Delivery*
2 1/2" caliper Bare Root 65 32 - 35" (no soil on roots) 10 - 16' McKay Delivery*
Balled & Burlap (B&B)
ItemApprox. Weight (lbs.)Approx. Base DiameterApprox. HeightShipping Method
2' tall B&B 50 12 - 16" 2'  McKay Delivery*
3' tall B&B 60 - 250 22 - 24" 4' McKay Delivery*
4' tall B&B 250 22 - 24"  5' McKay Delivery*
5' tall B&B 325 16 - 24" 5' McKay Delivery*
6' tall B&B 150 - 325 24 - 30"  6' McKay Delivery*
7' tall B&B 500 - 700 30"  7' McKay Delivery*
8' tall B&B 600 - 700 30 - 32" 8' McKay Delivery*
9' tall B&B 700 30 - 35" 9' McKay Delivery*
1 1/4" caliper B&B 250 - 700 22" - 28" 8 - 11' McKay Delivery*
1 1/2" caliper B&B 350 - 600 24" - 30"  10 - 12' McKay Delivery*
2" caliper B&B 600 - 700 28" - 32"  10 - 14' McKay Delivery*
2 1/2" caliper B&B 700 - 1,000 30" - 36" 10 - 16' McKay Delivery*
3" caliper B&B 850 - 1,200 34" - 38" 12 - 18' McKay Delivery*
3 1/2" caliper B&B 1,000 - 1,200 36"  3' McKay Delivery*

*McKay Delivery - This shipping method can only be used when your delivery address is within 60 miles of Waterloo, Wisconsin. McKay will hand delivery your nursery stock. We can delivey any size, but typically this shipping method is used for oversize items that FedEx cannot ship.

Growing Zones: 4-8

Bloom Time: August - October
Color: Blue, Green, Purple
Plant Size: 2-4' tall x 2-4' wide
Flower Color: Purple-blue
Sunlight: Full Sun to Partial Shade
Soil Conditions: Normal, Sandy, Clay, Acidic, Dry
Low Maintenance: Yes
Deer Resistant: No
Attracts Butterflies: Yes
Attracts Bees: Yes
Attracts Birds: Yes
Edible: No
Native: Yes

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