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Monarch® Blue Knight Butterfly Bush

Plants That Work

Availability : Sold Out
$64.99
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This product does not ship to: AZ, CA, ID, MT, NV, OR, UT, WA
  • Full Sun (At Least 6 Hours Of Direct Sunlight)
  • Mature Height 3 - 4 Feet
  • Mature Spread 3 - 4 Feet
  • Growing Zones 5 - 10

The Monarch® Blue Knight Butterfly Bush is a late bloomer, but it is worth waiting. Tiny, star-shaped, purplish-blue flowers bloom in large 10- to 12-inch panicles or clusters during the summer. A second flush of flowers will bloom during the fall. Also known as Buddleia, this plant features dense green and yellow leaves that stay in place throughout the growing season for consistent color.

This plant is a natural fit for a butterfly garden, but it also makes a lovely addition to beds, borders, or mass plantings. Plant it near other flowering plants or a vegetable garden to draw pollinators in or create a lovely flowering hedge. Trim the fragrant blooms to display in a vase. The Monarch® Blue Knight Butterfly Bush has a compact, rounded growth habit and grows as a perennial in USDA zones 5 through 10.

Monarch® Blue Knight Butterfly Bush Care

The ideal spot for this plant will receive full sun and have rich, moist soil that drains well. Water this beauty consistently for the first growing season, but established plants only need water weekly or when the top few inches of soil are dry. Feed the Monarch® Blue Knight Butterfly Bush with a balanced fertilizer when new growth emerges in the spring.

Deadhead this plant to extend the blooming period and encourage more flowers. Give the plant a trim during the late fall.

Monarch® Blue Knight Butterfly Bush Spacing

As an upright, branched plant, the Monarch® Blue Knight Butterfly Bush will grow 3 to 4 feet tall and 6 to 7 feet wide. Space plants 3 to 4 feet apart to create a hedge or continuous planting.

Monarch® Blue Knight Butterfly Bush Information

USDA Hardiness Zones: 5 - 10
Plant Type: Bushes
Light Exposure: Full Sun (At Least 6 Hours Of Direct Sunlight)
Mature Height: 3 - 4 Feet
Mature Spread: 6 - 7 Feet
Spacing: 6 - 7 Feet
Habit: Spreading, Upright
Flower Color(s): Blue, Purple
Flower Description:
Bloom Period:
Foliage Type: Deciduous
Foliage Color(s): Green
Foliage Description:
Seasonal Interest: Summer Flowering
Watering: Average
Resists: Deer
Tolerates: Drought
Attracts: Butterflies
Container Role:
Uses: Borders, Mass Planting, Wildlife Gardens
Features: Attracts Pollinators, Cut Flowers, Fragrant, Low Maintenance
Brand: Plants That Work
Common Name: Monarch® Blue Knight Butterfly Bush
Other Name(s):
Scientific Name: BUDDLEIA MONARCH `BLUE KNIGHT`
SKU:
1231014275-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.

Quart Pot

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

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

#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

#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

#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

#5 Pot

#5 Pot

Also Known As:
#5 Container
5 Gallon

Plant Age:
~3-4 years old

Plant Size:
~ 20" - 60"

Pot Size:
~11" H x 10 1/2” W

Volume:
3.5 - 4 gallons

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Best in Class Warranty

We stand behind our plants with industry-leading guarantees to give you peace of mind.

Arrival Guarantee

We want your plants to arrive in great condition! If you notice any issues upon delivery, contact us within 3 days.

Free 1-Year Plant Warranty

All bushes, perennials & trees come with an extended 1-year warranty for added confidence. If your plant dies due to a health issue within a year, we’ll make it right.

Plant Shipping

Pre-Ordered Plants

Pre-ordered plants are scheduled to ship in Spring 2025. We carefully plan our shipping dates based on your USDA Plant Hardiness Zone to ensure optimal planting conditions upon arrival. Want it sooner/later? Reach out, and we'll try our best to accommodate.

Estimated Spring Shipping Schedule

Estimated ship week for pre-ordered plants will ship based on growing zones as shown below.

Growing Zone Estimated Ship Week
Zone 10March 24th
Zone 9March 31st
Zone 8April 7th
Zone 7April 14th
Zone 6bApril 21st
Zone 6aApril 28th
Zone 5bMay 5th
Zone 5aMay 12th
Zone 4May 19th
Zone 3May 26th

Note: These are only estimated ship dates. Plants may ship out later depending on weather & growing conditions of the plant.

Note: Only plants indicated as pre-order will ship as shown above. All other plants and hard goods will ship as normal.

Plants Shipping Now

Plants that are currently in stock typically ship within 2-7 business days after your order is placed.