New Guinea Impatiens, named for their native habitat of Papua New Guinea, have been a mainstay in spring and summer programs since their introduction the US in 1972. Years of breeding and hybridization have made this plant a versatile choice in landscape, baskets and combination planters for many growers.
General Growing Tips For Your Rooted Cutting Liner
For best results with New Guinea Impatiens, we recommend using a constant feed program of 100-150 ppm N. Maintain a pH between 5.8 - 6.2. New Guineas are very susceptible to salts injury so ensure proper run-off and plan for a clear water drench weekly.
Pinching
Pinchingis not recommended as New Guineas are free-branching plants. Pinching will delay flower production by 2-3 weeks, so it can be used as an effective timing tool to delay flowering.
Spacing
Spacing too close will result in excessive stretching. Space pots adequately to allow for light penetration and airflow between foliage of adjacent pots. We recommend seven inches for 4” pots and eighteen inches for 10” pots.
Height Control
Stretching is best controlled with high levels of light, proper watering, and low fertilization. If PGRs are desired for varieties that stretch, NC State has tested a foliar spray of Bonzi at 5-30 ppm with good results.
Pests
Spider mites and thrips are the primary pests attracted to New Guinea Impatiens.
Disease
Harmony Bicolor Red are not prone to many diseases, but watch for botrytis while the days are short. This grey rot is usually associated with wet or humid conditions. You can prevent botrytis by allowing the plant to dry out between waterings, allowing for good airflow in your greenhouse, and spacing to allow the sun to penetrate to the soil level. The most common chemicals used to treat botrytis are Medallion and Banrot. Use them as a drench according to each label’s instructions.
Planting Harmony Bicolor Red Liners
We recommend planting 4 starter plants per 10 inch basket. Use a well-drained soil in your baskets and plant your starter plants deep, allowing the ellepot to be completely covered by the soil. If you are planting 4” pots, 1 plant per pot should be sufficient if you have enough time. Plant it directly in the middle of your pot.
Pinchingis not recommended.
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.
New Guinea Impatiens Harmony Bicolor Red Quick Reference Guide
4 Inch crop time
4-6 Weeks
10 Inch crop time
8-10 Weeks
Bloom Period
Fall, Spring, Summer
Color
Red
Habit
Mounding
Height
18-48 Inches
Light
Partial Shade
Minimum Temp
55
Water Needs
Moderate
Patented Plant
Yes
Current
Availability
Current Availability
09-07-2026 (Week 37)
0
09-14-2026 (Week 38)
0
09-21-2026 (Week 39)
0
09-28-2026 (Week 40)
0
10-05-2026 (Week 41)
0
10-12-2026 (Week 42)
0
10-19-2026 (Week 43)
200
10-26-2026 (Week 44)
600
11-02-2026 (Week 45)
1,200
11-09-2026 (Week 46)
2,400
11-16-2026 (Week 47)
3,000
11-23-2026 (Week 48)
3,500
11-30-2026 (Week 49)
5,100
12-07-2026 (Week 50)
5,500
12-14-2026 (Week 51)
6,200
12-21-2026 (Week 52)
6,300
12-28-2026 (Week 53)
6,600
01-04-2027 (Week 01)
5,700
01-11-2027 (Week 02)
7,700
01-18-2027 (Week 03)
8,300
01-25-2027 (Week 04)
8,000
02-01-2027 (Week 05)
7,600
02-08-2027 (Week 06)
6,800
02-15-2027 (Week 07)
6,100
02-22-2027 (Week 08)
6,900
03-01-2027 (Week 09)
6,700
03-08-2027 (Week 10)
7,100
03-15-2027 (Week 11)
7,100
03-22-2027 (Week 12)
8,300
03-29-2027 (Week 13)
8,400
04-05-2027 (Week 14)
3,800
04-12-2027 (Week 15)
4,400
04-19-2027 (Week 16)
4,400
04-26-2027 (Week 17)
4,400
05-03-2027 (Week 18)
2,100
05-10-2027 (Week 19)
2,100
05-17-2027 (Week 20)
2,100
05-24-2027 (Week 21)
2,100
05-31-2027 (Week 22)
2,100
New Guinea Impatiens, named for their native habitat of Papua New Guinea, have been a mainstay in spring and summer programs since their introduction the US in 1972. Years of breeding and hybridization have made this plant a versatile choice in landscape, baskets and combination planters for many growers.
General Growing Tips For Your Rooted Cutting Liner
For best results with New Guinea Impatiens, we recommend using a constant feed program of 100-150 ppm N. Maintain a pH between 5.8 - 6.2. New Guineas are very susceptible to salts injury so ensure proper run-off and plan for a clear water drench weekly.
Pinching
Pinchingis not recommended as New Guineas are free-branching plants. Pinching will delay flower production by 2-3 weeks, so it can be used as an effective timing tool to delay flowering.
Spacing
Spacing too close will result in excessive stretching. Space pots adequately to allow for light penetration and airflow between foliage of adjacent pots. We recommend seven inches for 4” pots and eighteen inches for 10” pots.
Height Control
Stretching is best controlled with high levels of light, proper watering, and low fertilization. If PGRs are desired for varieties that stretch, NC State has tested a foliar spray of Bonzi at 5-30 ppm with good results.
Pests
Spider mites and thrips are the primary pests attracted to New Guinea Impatiens.
Disease
Harmony Bicolor Red are not prone to many diseases, but watch for botrytis while the days are short. This grey rot is usually associated with wet or humid conditions. You can prevent botrytis by allowing the plant to dry out between waterings, allowing for good airflow in your greenhouse, and spacing to allow the sun to penetrate to the soil level. The most common chemicals used to treat botrytis are Medallion and Banrot. Use them as a drench according to each label’s instructions.
Planting Harmony Bicolor Red Liners
We recommend planting 4 starter plants per 10 inch basket. Use a well-drained soil in your baskets and plant your starter plants deep, allowing the ellepot to be completely covered by the soil. If you are planting 4” pots, 1 plant per pot should be sufficient if you have enough time. Plant it directly in the middle of your pot.
Pinchingis not recommended.
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.
New Guinea Impatiens Harmony Bicolor Red Quick Reference Guide
4 Inch crop time
4-6 Weeks
10 Inch crop time
8-10 Weeks
Bloom Period
Fall, Spring, Summer
Color
Red
Habit
Mounding
Height
18-48 Inches
Light
Partial Shade
Minimum Temp
55
Water Needs
Moderate
Patented Plant
Yes
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