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 Not recommended

USDA HARDINESS ZONES

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

BLOOM MONTHS April to September

HEIGHT

Typically not required

PGRs generally not needed

Aphids on the buds Rooted: 6 wks

Rooted: 6-8 wks

10-12 in. (25-30 cm)

4-9

Typically not required

PGRs generally not needed

Pythium and rhizoctonia can result from overwatering.

Unrooted: 13-15 wks Rooted: 8-10 wks

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

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

26-28 in. (66-71 cm)

4-9

April to September

Recommended PGRs generally not needed

Thrips, white fly

Not recommended

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

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

15-18 in. (38-46 cm)

5-9

April to September

Recommended PGRs generally not needed

Thrips, white fly

Not recommended

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

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

9-12 in. (23-30 cm)

7-10

April to September

Typically not required

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

Not particularly sensitive. Use well-drained media. Not particularly sensitive. Use well-drained media.

Not recommended

Rooted: 6-8 wks

10-12 wks

14-16 in. (36-41 cm)

4-9

Non- flowering

Typically not required

Not recommended

Rooted: 6-8 wks

10-12 wks

16-18 in. (41-46 cm)

4-9

Non- flowering

One pinch, two to three weeks after transplant

PGRs generally not needed

Thrips, spider mites

Not recommended

Rooted: 12-14 wks Rooted: 14 wks

28-36 in. (71-91 cm)

6-9

August to October

One pinch, two to three weeks after transplant.

PGRs generally not needed

Thrips, spider mites

Not recommended

Rooted: 12-14 wks Rooted: 14 wks

28-36 in. (71-91 cm)

6-9

August to October

No

PGRs generally not needed

Spider mites

Not recommended

Rooted: 12-14 wks Rooted: 14 wks

48 in. (122 cm)

6-9

August to October

No

B-Nine/Cycocel combination at 3,750-5,000 ppm, B-Nine/Cycocel 500 ppm before flowering. Sumagic spray can be used after flowering if needed. PGRs generally not needed

Spider mites, thrips

Not recommended

Rooted: 10-12 wks Rooted: 12-14 wks

12-14 in. (30-36 cm)

5-9

March to November

Typically not required

Aphids on the buds Rooted: 6 wks

9-11 wks

Not recommended

4-6 in. (10-15 cm)

5-9

March to October

Not recommended

6-8 in. (15-20 cm)

4-9

March to October

18-20 wks, including 6 wks below 50°F (10°C)

No

PGRs generally not needed

Thrips, carnation mottle virus

18-20 wks, including 6 wks below 50°F (10°C)

Not recommended

10-12 in. (25-30 cm)

4-9

March to October

18-20 wks, including 6 wks below 50°F (10°C) 18-20 wks, including 6 wks below 50°F (10°C) 18-20 wks, including 6 wks below 50°F (10°C)

No

PGRs generally not needed

Thrips, carnation mottle virus

18-20 wks, including 6 wks below 50°F (10°C) 18-20 wks, including 6 wks below 50°F (10°C) 18-20 wks, including 6 wks below 50°F (10°C) Not recommended

Not recommended

8-10 in. (20-25 cm)

4-9

March to October

No

PGRs generally not needed

Thrips, carnation mottle virus

Not recommended

5-6 in. (13-15 cm)

4-9

March to October

No

PGRs generally not needed

Thrips, carnation mottle virus

Recommended for more flowers per

PGRs generally not needed

Aphids, white fly, spider mites

Rooted: 12-14 wks Rooted: 14 wks

18-24 in. (46-61 cm)

5-9

April to September;

Natural season flowering

plant. Not required.

22-24 in. (56-61 cm)

4-9

June to August

14-16 wks Spring plant; 11-13 wks Summer plant for Fall

No

B9/Cycocel combination at 3750-5000 ppm B9/500 ppm Cycocel before flowering. Sumagic spray can be used after flowering if needed. Do not use configure in finished containers PGRs generally not needed Not recommended. 300 ppm Configure 2 weeks after transplant when greenhouse grown will reduce overall plant height.

None noted

14-16 wks Spring plant; 11-13 wks Summer plant for Fall

Only to remove premature flower buds. Only to remove premature flower buds.

Not particularly sensitive. Use well-drained media. Not particularly sensitive. Use well-drained media.

Not recommended

10-12 wks

Not recommended

14-16 in. (36-41 cm)

4-9

June to August

Not recommended

10-12 wks

Liner: 16-18 wks

18-20 in. (46-51 cm)

4-9

June to August

FINISHING GUIDE | 77

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