Darwin 2026 Perennials Catalog - Star Roses

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

PLANT GROWTH REGULATORS

PINCHING AFTER TRANSPLANT

PESTS AND FUNGAL DISEASES

2 TO 3-GAL. (25 TO 30-CM) POT, 3 PLANTS PER POT Unrooted: 14-16 wks Rooted: 10-12 wks

USDA HARDINESS ZONES

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

BLOOM MONTHS July to September

HEIGHT

Not recommended Unrooted: 14-16 wks Rooted: 10-12 wks

18-24 in. (46-61 cm)

4-9

Recommended PGRs generally not needed

Pythium can be a problem if overwatered. White fly, spider mites. Powdery mildew when pressure is high.

Rooted: 7-9 wks

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

14-16 in. (36-41 cm)

4-8

April to May

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

Powdery mildew when pressure is high.

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.

Powdery mildew when pressure is high.

Not recommended Rooted: 10-12 wks Rooted: 12-14 wks

16-18 in. (41-46 cm)

4-9

June to August

Powdery mildew when pressure is high.

Not recommended Rooted: 10-12 wks Rooted: 12-14 wks

18-20 in. (46-51 cm)

4-9

June to August

6-8 wks

10-12 wks

12-14 wks

6-8 in. (15-20 cm)

5-9

April to June

None

PGRs generally not needed

Pythium and rhizoctonia can result from overwatering.

Aphids, leaf miners, leaf spot.

Not recommended 12-14 wks

12-14 wks

30-34 in. (76-86 cm)

5-9

Late June to September

None

B-Nine/Cycocel combination at 3,750 ppm/500 ppm can be used to tone foliage. May delay flowering. Sumagic sprays after flower initiation if needed.

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

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

Once for smaller pot sizes, twice for larger containers.

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

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.

3-9

September to October

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.

(5-10 cm)

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.

5-9

July to August

PGRs generally not needed. B-Nine is effective if needed, especially under lower light conditions

(18-25 cm)

PGRs generally not needed

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

Rooted: 4-6 wks

Rooted: 6-8 wks

10-12 wks

2-5 in. (5-13 cm)

4-8

June to July

Typically not required

Not particularly sensitive. Use well- drained media.

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

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

Recommended PGRs generally not needed

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

FINISHING GUIDE | 91

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