Darwin Perennials 2025 catalog - Star Roses

CROP SCHEDULE & USES 1-QT. (10-CM) POT, 1 PLANT PER POT

PINCHING AFTER TRANSPLANT

PLANT GROWTH REGULATORS

PESTS AND FUNGAL DISEASES

2 TO 3-GAL. (25 TO 30-CM) POT, 3 PLANTS PER POT

USDA HARDINESS ZONES

1-GAL. (15-CM) POT, 1 PLANT PER POT

BLOOM MONTHS July to September

HEIGHT

Recommended Concise/Sumagic 30-60 ppm spray

None noted

Not recommended

Rooted: 20 wks

Rooted: 20 wks

36-48 in. (91-122 cm)

3-9

24-32 in. (61-81 cm)

4-9

July to October

Unrooted: 15-17 wks Rooted: 10-12 wks Natural flowering early July

One pinch, two to three weeks after transplant. Yes, in cases where there are two or less shoots.

PGRs generally not needed

Aphids, white fly, spider mites

Not recommended

Unrooted: 15-17 wks Rooted: 10-12 wks Natural flowering in early July

Not particularly sensitive. Use well- drained media. Pythium and rhizoctonia can result from overwatering.

Not recommended

9-11 wks

10-12 wks

24-30 in. (61-76 cm)

4-9

June to September

B-Nine/Cycocel sprays 2,500/1,000 ppm

No

PGRs generally not needed

6-8 wks

10-12 wks

12-14 wks

10-12 in. (25-30 cm)

4-9

April to May

No

PGRs generally not needed

Watch for crown rot if overwatered.

Not recommended

Rooted: 6-8 wks

10-12 wks

16-18 in. (41-46 cm)

4-9

April to May

Only if pinching not done in the liner stage.

PGRs generally not needed

Not particularly sensitive.

24 wks; requires vernalization

24 wks; requires vernalization

Not recommended

6-8 in. (15-20 cm)

4-9

February to April

14-16 wks for Summer to Fall flowering

26-29 in. (66-74 cm)

6-9

July to November

None

PGRs not needed

Pythium can result from overwatering. Aphids can also be a problem.

Not recommended

12-14 wks for Summer to Fall flowering

Unrooted: 14-16 wks Rooted: 7-8 wks

Unrooted: 16-19 wks Rooted: 9-11 wks

Unrooted: 19-22 wks Rooted: 12-14 wks

16-18 in. (41-46 cm)

4-9

April to September

Once for smaller pot sizes, twice for larger containers. Once for smaller pot sizes, twice for larger containers.

PGRs generally not needed

Thielaviopsis, pythium and rhizoctonia can result from overwatering. Thrips, white fly, aphids, fungus gnats. Thielaviopsis, pythium and rhizoctonia can result from overwatering. Thrips, white fly, aphids, fungus gnats. Thielaviopsis, pythium and rhizoctonia can result from overwatering. Thrips, white fly, aphids, fungus gnats. Thielaviopsis, pythium and rhizoctonia can result from overwatering. Thrips, white fly, aphids, fungus gnats. Thielaviopsis, pythium and rhizoctonia can result from overwatering. Thrips, white fly, aphids, fungus gnats. Watch for crown rot if overwatered.

Unrooted: 14-16 wks Rooted: 7-8 wks

Unrooted: 16-19 wks Rooted: 9-11 wks

Unrooted: 19-22 wks Rooted: 12-14 wks

10-12 in. (25-30 cm)

5-8

April to September

PGRs generally not needed

7-10 wks

9-11 wks, 1-3 ppp 10-12 wks, 3-5 ppp 14-18 in. (36-46 cm)

6-9

March to July

Recommended PGRs generally not needed

7-10 wks

9-11 wks, 1-3 ppp 10-12 wks, 3-5 ppp 10-12 in. (25-30 cm)

6-9

March to July

A final pinching 8 to 10 weeks before flowering will help to increase flower count. Not necessary if pinches provided in liner

PGRs generally not needed

7-10 wks

9-11 wks

10-12 wks

16-18 in. (41-46 cm)

7-9

Year round depending on location

PGRs generally not needed

Typically not required

PGRs generally not needed

Not recommended

9-11 wks

12-14 wks

14-17 in. (36-43 cm)

5-9

June to August

Typically not required

PGRs generally not needed

Watch for crown rot if overwatered.

7-10 wks

9-11 wks

Not recommended

14-16 in. (36-41 cm)

5-9

March to October

No

None

Rust resistant

8-10 wks

14-16 wks

20-24 wks, 1 ppp

30-36 in. (76-91 cm)

5-9

October to November

No

PGRs generally not needed

Watch for crown rot if overwatered.

Not recommended Not recommended

Liner: 16-18 wks

80-86 in. (203-218 cm)

5-9

September to October

No

None

Rust resistant

Not recommended

16-18 wks

24-26 wks, 1 ppp

72-102 in. (183-259 cm)

5-9

October to November

Recommended PGRs generally not needed

Powdery mildew may be present if grown under poor air circulation and high humidity. White fly, spider mites.

Unrooted: 12-14 wks Rooted: 8-10 wks

Unrooted: 14-16 wks Rooted: 10-12 wks

Unrooted: 14-16 wks Rooted: 12-14 wks

10-12 in. (25-30 cm)

4-9

June to July

Typically not required

PGRs generally not needed

Powdery mildew when pressure is high.

Not recommended

9-11 wks

10-12 wks

15-18 in. (38-46 cm)

4-9

June to July

Aphids, white fly, spider mites

Not recommended

Unrooted: 15-17 wks Rooted: 10-12 wks

Unrooted: 15-17 wks Rooted: 10-12 wks

28-36 in. (71-91 cm)

4-9

March to September

Not necessary when pinched in liner.

Use B-Nine/Cycocel 2,500/800 ppm to control height

FINISHING GUIDE | 79

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