Darwin 2026 Perennials Catalog - Star Roses

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

PLANT GROWTH REGULATORS PGRs generally not needed

PINCHING AFTER TRANSPLANT

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

HEIGHT

Not recommended 5-6 in.

4-9

March to October

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

No

Thrips, carnation mottle virus

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

(13-15 cm)

PGRs generally not needed

Aphids, white fly, spider mites

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

18-24 in. (46-61 cm)

5-9

April to September;

Recommended for more flowers per plant. Not required.

Natural season flowering

22-24 in. (56-61 cm)

4-9

June to August

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

None noted

14-16 wks Spring plant; 11-13

No

B-Nine/Cycocel combination at 3,750-5,000 ppm, B-Nine/500 ppm Cycocel before flowering. Sumagic spray can be used after flowering if needed. Do not use configure in finished containers.

wks Summer plant for Fall

Not recommended 10-12 wks

Not recommended 14-16 in. (36-41 cm)

4-9

June to August

PGRs generally not needed

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

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

Not recommended 10-12 wks

Liner: 16-18 wks

18-20 in. (46-51 cm)

4-9

June to August

Not recommended. 300 ppm Configure 2 weeks after transplant when greenhouse grown will reduce overall plant height.

Sumagic 5-10 ppm spray

Watch for bacterial infections.

6-8 wks

10-12 wks

12-14 wks

18-24 in. (46-61 cm)

6-8

March to September

Yes, a second pinch is often beneficial.

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

July to September

24-32 in. (61-81 cm)

4-9

July to October

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

PGRs generally not needed

Aphids, white fly, spider mites

Not recommended Unrooted: 15-17 wks Rooted: 10-12 wks Natural flowering in early July

One pinch, two to three weeks after transplant.

Not recommended Rooted: 8-10 wks Rooted: 10-12 wks

15-17 in. (38-43 cm)

5-9

June to October

Aphids, thrips, downy mildew, powdery mildew

Pinch at transplant.

B-Nine 3,750 ppm/ Cycocel 500 ppm as necessary before color. Sumagic 5-10 ppm after coloring. Generally not needed. B-Nine/ Cycocel combination Cycocel 500 ppm before flowering. Sumagic spray can be used after flowering if needed. at 3,750-5,000 ppm, B-Nine/

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

10-12 in. (25-30 cm)

3-8

March to November

Spider mites, thrips, botrytis, bacterial spotting

None

PGRs generally not needed

Very pest and disease resistant.

Not recommended 12-14 wks. Plant Week 22-26

12-14 wks. Plant Week 22-26

24-26 in. (61-66 cm)

5-10

September to November

Typically not necessary if plants were pinched in the liner. Yes, in cases where there are two or less shoots.

Not recommended 9-11 wks

10-12 wks

24-30 in. (61-76 cm)

4-9

June to September

Not particularly sensitive. Use well- drained media. Pythium and rhizoctonia can result from overwatering. Thrips, white fly, aphids. Pythium and rhizoctonia can result from overwatering.

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

Unrooted: 14-16 wks Rooted: 8-10 wks

Unrooted: 16-19 wks Rooted: 10-12 wks

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

14-16 in. (36-41 cm)

4-9

June to August

Recommended 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

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

PGRs generally not needed

Not particularly sensitive.

24 wks; requires vernalization

24 wks; requires vernalization

Not recommended 6-8 in.

4-9

February to April

Only if pinching not done in the liner stage.

(15-20 cm)

14-16 wks for Summer to Fall flowering

26-29 in. (66-74 cm)

6-9

July to November

Not recommended 12-14 wks for Summer to Fall flowering

None

PGRs not needed

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

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