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

USDA HARDINESS ZONES

1-GAL. (15-CM) POT, 1 PLANT PER POT Unrooted: 15-17 wks Rooted: 10-12 wks

BLOOM MONTHS May to September

HEIGHT

Recommended PGRs generally not needed

White fly

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

18 in. (46 cm)

4-8

Spider mites, thrips

Not recommended

9-11 wks

10-12 wks

24-28 in. (61-71 cm)

4-9

April to September

Typically not required

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

Yes

PGRs generally not needed

Spider mites, thrips. Watch for INSV/ TSWV.

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

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

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

12 in. (30 cm)

5-8

April to September

Yes

PGRs generally not needed

White fly, spider mites

Not recommended

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

18-20 in. (46-51 cm)

5-9

May to August

Recommended PGRs generally not needed

Pythium can be a problem if overwatered. White fly, spider mites. Powdery mildew when pressure is high. Powdery mildew when pressure is high. Powdery mildew when pressure is high. Pythium and rhizoctonia can result from overwatering.

Not recommended

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

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

28-30 in. (71-76 cm)

4-9

July to September

Rooted: 7-9 wks

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

6-8 in. (15-20 cm)

4-8

April to May

Yes, in cases where there are two or less shoots. Yes, in cases where there are two or less shoots. Yes, in cases where there are two or less shoots.

Configure at 600 ppm to increase branching Configure at 600 ppm to increase branching Configure at 600 ppm to increase branching

Not recommended

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

16-18 in. (41-46 cm)

4-9

June to August

Not recommended

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

18-20 in. (46-51 cm)

4-9

June to August

None

PGRs generally not needed

6-8 wks

10-12 wks

12-14 wks

6-8 in. (15-20 cm)

5-9

April to June

Yes

PGRs generally not needed

White fly, thrips

Rooted: 6-8 wks

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

12-14 in. (30-36 cm)

7-9

March to September

Once for smaller pot sizes, twice for larger containers.

PGRs generally not needed

White fly, spider mites

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

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

Unrooted: 16-18 wks Rooted: 12-14 wks

16-18 in. (41-46 cm)

7-10

March to September

Yes

PGRs generally not needed

White fly, spider mites, botrytis

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

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

Unrooted: 17-19 wks Rooted: 12-14 wks

20-22 in. (51-56 cm)

4-9

March to September

Yes

PGRs generally not needed

White fly, spider mites, botrytis

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

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

Unrooted: 17-19 wks Rooted: 12-14 wks

22-24 in. (56-61 cm)

4-9

March to September

Spider mites

Not recommended

10-12 wks

12-14 wks

14-16 in. (36-41 cm)

4-9

March to September

Typically not required

Will respond to 300 ppm Configure spray at young plant level PGRs generally not needed PGRs generally not needed. B9 is effective if needed, especially under lower light conditions PGRs generally not needed

One pinch, two to three weeks after transplant. One pinch, two to three weeks after transplant. One pinch, two to three weeks after transplant. One pinch, two to three weeks after transplant. Typically not required

Generally pest and disease free.

Unrooted: 10-12 wks Rooted: 6 wks

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

Not recommended

2-4 in. (5-10 cm)

3-9

Generally pest and disease free.

Unrooted: 10-12 wks Rooted: 6 wks

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

Not recommended

7-10 in. (18-25 cm)

5-9

July to August

Generally pest and disease free.

Unrooted: 10-12 wks Rooted: 6 wks

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

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

3-6 in. (8-15 cm)

4-9

Non- flowering

PGRs generally not needed

Generally pest and disease free.

Unrooted: 10-12 wks Rooted: 6 wks

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

Not recommended

2-5 in. (5-13 cm)

5-9

July to August

Not particularly sensitive. Use well- drained media.

Rooted: 4-6 wks

Rooted: 6-8 wks

10-12 wks

2-5 in. (5-13 cm)

4-8

June to July

Yes

PGRs generally not needed

Aphids, white fly

Not recommended

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

Unrooted: 16-18 wks Rooted: 12-14 wks

14-18 in. (36-46 cm)

4-9

April to September

Yes

PGRs generally not needed

Aphids, white fly

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

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

Unrooted: 16-18 wks Rooted: 12-14 wks

12-14 in. (30-36 cm)

4-9

May to October

Recommended PGRs generally not needed

Watch for thielaviopsis, pythium, white fly, spider mites.

Unrooted: 11-13 wks Rooted: 6-8 wks

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

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

8-10 in. (20-25 cm)

4-9

February to October

FINISHING GUIDE | 81

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