Purple Knight, also known as Alternanthera dentata, Joseph's Coat, and Joyweed, is an herbaceous perennial native to the West Indies and Brazil. Perennial in zone 9-11, this plant flourishes in full or partial sun with moderate water. Dark purple foliage has an upright, mounded habit 18-36" tall and wide, bringing texture and color to containers and landscape borders. Heat-tolerant and low-maintenance, PurpleKnight is an excellent addition to the annual garden in cold regions or year-round tropical landscapes in warm areas. For a more compact variety, plant Purple Prince.
Purple Knight Selling Tips
Sell Purple Knight to customers looking for low-maintenance foliage for containers or landscape borders. This plant flourishes in full or partial sun, tolerates heat and weather, and resists disease. With moderate water, attractive purple foliage brings texture and contrast to mixed containers and borders. Create stunning combinations by growing this plant alongside Petunia, Coleus, Cordyline, and Plectranthus.
Coach Your Customer
1. Space plants 12-14" apart in well-drained soil in full or partial sun. Foliage is darkest in full sun.
2. Water once a week or more often in drought.
3. Remove plants after frost or overwinter small containers indoors outside of zone 10.
General Growing Tips For Your Seedling Tray
For best results with Purple Knight, plant one rooted plug per 4-inch container or two to three per 10-inch container. Use well-drained soil with a pH of 5.5-5.8, EC of 0.6-0.9 mS/cm (2:1), high feed (200-300 ppm N), and average daily temperatures of 65-72 degrees. This plant doesn't require pinching but pinching will increase branching and can be used for shaping. It may need PGRs in small containers and responds to Bonzi or Sumagic. It isn't prone to pests or disease.
Flowering
This plant is prized for its foliage.
Pinching
Pinch to shape and increase branching but pinching isn't required.
Spacing
Space containers for adequate airflow and sunlight penetration around the base and foliage of each plant.
Height Control
This plant doesn't typically require PGRs but may need height control in small containers. Use Bonzi or Sumagic according to the label instructions.
Pests
This plant isn't prone to pests.
Disease
Alternanthera isn't prone to disease. Always take the following precautions in your greenhouse.
1. Water at the base of each plant in the morning, allowing the soil to dry between waterings.
2. Provide good airflow.
3. Space containers so sunlight can reach the soil level of each plant.
Planting Purple Knight Liners
Plant one rooted liner per 4-inch container or two to three per 10-inch container. Use well-drained soil and completely bury the ellepot centered or evenly spaced in the container.
Rooted Cuttings
Cuttings vary in size between different plant families. These rooted starter plants will arrive ready to be transplanted in to your final container. If they are to be used in a landscape application, you will need to establish them in a 4 inch pot or an 1801 before planting outside.
Alternanthera Purple Knight Quick Reference Guide
4 Inch crop time
4-6 Weeks
10 Inch crop time
10-12 Weeks
Color
Purple
Habit
Mounding, Upright
Height
18-36 inches
Light
Full Sun, Partial Sun
Minimum Temp
60
Perennial Zone
Zones 9-11
Water Needs
Moderate
Patented Plant
No
Current Availability
Current Availability
12-11-2023 (Week 50)
0
12-18-2023 (Week 51)
0
12-25-2023 (Week 52)
0
01-01-2024 (Week 01)
0
01-08-2024 (Week 02)
4,000
01-15-2024 (Week 03)
4,000
01-22-2024 (Week 04)
4,000
01-29-2024 (Week 05)
4,000
02-05-2024 (Week 06)
4,000
02-12-2024 (Week 07)
4,000
02-19-2024 (Week 08)
4,000
02-26-2024 (Week 09)
4,000
03-04-2024 (Week 10)
4,000
03-11-2024 (Week 11)
4,000
03-18-2024 (Week 12)
4,000
03-25-2024 (Week 13)
3,750
04-01-2024 (Week 14)
4,000
04-08-2024 (Week 15)
4,000
04-15-2024 (Week 16)
4,000
04-22-2024 (Week 17)
4,000
04-29-2024 (Week 18)
4,000
05-06-2024 (Week 19)
4,000
05-13-2024 (Week 20)
4,000
05-20-2024 (Week 21)
4,000
05-27-2024 (Week 22)
3,250
06-03-2024 (Week 23)
4,000
06-10-2024 (Week 24)
4,000
06-17-2024 (Week 25)
4,000
06-24-2024 (Week 26)
4,000
07-01-2024 (Week 27)
4,000
07-08-2024 (Week 28)
4,000
07-15-2024 (Week 29)
4,000
07-22-2024 (Week 30)
0
07-29-2024 (Week 31)
0
08-05-2024 (Week 32)
0
08-12-2024 (Week 33)
0
08-19-2024 (Week 34)
0
08-26-2024 (Week 35)
0
09-02-2024 (Week 36)
0
Purple Knight, also known as Alternanthera dentata, Joseph's Coat, and Joyweed, is an herbaceous perennial native to the West Indies and Brazil. Perennial in zone 9-11, this plant flourishes in full or partial sun with moderate water. Dark purple foliage has an upright, mounded habit 18-36" tall and wide, bringing texture and color to containers and landscape borders. Heat-tolerant and low-maintenance, PurpleKnight is an excellent addition to the annual garden in cold regions or year-round tropical landscapes in warm areas. For a more compact variety, plant Purple Prince.
Purple Knight Selling Tips
Sell Purple Knight to customers looking for low-maintenance foliage for containers or landscape borders. This plant flourishes in full or partial sun, tolerates heat and weather, and resists disease. With moderate water, attractive purple foliage brings texture and contrast to mixed containers and borders. Create stunning combinations by growing this plant alongside Petunia, Coleus, Cordyline, and Plectranthus.
Coach Your Customer
1. Space plants 12-14" apart in well-drained soil in full or partial sun. Foliage is darkest in full sun.
2. Water once a week or more often in drought.
3. Remove plants after frost or overwinter small containers indoors outside of zone 10.
General Growing Tips For Your Seedling Tray
For best results with Purple Knight, plant one rooted plug per 4-inch container or two to three per 10-inch container. Use well-drained soil with a pH of 5.5-5.8, EC of 0.6-0.9 mS/cm (2:1), high feed (200-300 ppm N), and average daily temperatures of 65-72 degrees. This plant doesn't require pinching but pinching will increase branching and can be used for shaping. It may need PGRs in small containers and responds to Bonzi or Sumagic. It isn't prone to pests or disease.
Flowering
This plant is prized for its foliage.
Pinching
Pinch to shape and increase branching but pinching isn't required.
Spacing
Space containers for adequate airflow and sunlight penetration around the base and foliage of each plant.
Height Control
This plant doesn't typically require PGRs but may need height control in small containers. Use Bonzi or Sumagic according to the label instructions.
Pests
This plant isn't prone to pests.
Disease
Alternanthera isn't prone to disease. Always take the following precautions in your greenhouse.
1. Water at the base of each plant in the morning, allowing the soil to dry between waterings.
2. Provide good airflow.
3. Space containers so sunlight can reach the soil level of each plant.
Planting Purple Knight Liners
Plant one rooted liner per 4-inch container or two to three per 10-inch container. Use well-drained soil and completely bury the ellepot centered or evenly spaced in the container.
Rooted Cuttings
Cuttings vary in size between different plant families. These rooted starter plants will arrive ready to be transplanted in to your final container. If they are to be used in a landscape application, you will need to establish them in a 4 inch pot or an 1801 before planting outside.
Alternanthera Purple Knight Quick Reference Guide
4 Inch crop time
4-6 Weeks
10 Inch crop time
10-12 Weeks
Color
Purple
Habit
Mounding, Upright
Height
18-36 inches
Light
Full Sun, Partial Sun
Minimum Temp
60
Perennial Zone
Zones 9-11
Water Needs
Moderate
Patented Plant
No
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