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 Once for smaller pot sizes, twice for larger containers.

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: 16-19 wks Rooted: 9-11 wks

BLOOM MONTHS April to September

HEIGHT

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

16-18 in. (41-46 cm)

4-9

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.

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

Once for smaller pot sizes, twice for larger containers.

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

PGRs generally not needed

A final pinching 8 to 10 weeks before flowering will help to increase flower count.

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

10-12 wks

16-18 in. (41-46 cm)

7-9

Year round depending on location

PGRs generally not needed

Not necessary if pinches provided in liner

Typically not required

PGRs generally not needed

Watch for crown rot if overwatered.

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

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

Recommended PGRs generally not needed

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

Typically not required

PGRs generally not needed

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

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

Not necessary when pinched in liner.

Recommended PGRs generally not needed

White fly

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

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

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

18 in. (46 cm)

4-8

May to September

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

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

Spider mites, thrips. Watch for INSV/TSWV.

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

Yes

PGRs generally not needed

Spider mites

Not recommended Unrooted: 19-22 wks Rooted: 12-14 wks

Unrooted: 21-23 wks Rooted: 14-16 wks

20-24 in. (51-61 cm)

6-9

July to August

Not recommended Unrooted: 15-17 wks Rooted: 10-12 wks

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

30-34 in. (76-86 cm)

5-8

May to July

Yes

PGRs generally not needed

Spider mites, thrips. Watch for INSV/TSWV.

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

Recommended PGRs generally not needed

Pythium can be a problem if overwatered. White fly, spider mites.

FINISHING GUIDE | 89

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