Darwin Perennials 2026 Catalog

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

USDA HARDINESS ZONES

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

BLOOM MONTHS March to November

HEIGHT

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

10-12 in. (25-30 cm)

3-8

None

Generally not needed. B-Nine/ Cycocel combination

Spider mites, thrips, botrytis, bacterial spotting

at 3,750-5,000 ppm, B-Nine/

Cycocel 500 ppm before flowering. Sumagic spray can be used after flowering if needed.

Yes

PGRs generally not needed

Spider mites, thrips Not recommended Rooted: 10-12 wks Rooted: 10-12 wks

14-16 in. (36-41 cm)

4-9

July to September

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

Recommended PGRs generally not needed

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

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

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

Unrooted: 16-18 wks Rooted: 10-12 wks

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

10-12 in. (25-30 cm)

6-9

May to October

Recommended PGRs generally not needed

May experience root rot diseases under poor growing conditions. Aphids.

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.

PGRs generally not needed

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

16-18 in. (41-46 cm)

4-9

April to September

Once for smaller pot sizes, twice for larger containers. Once for smaller pot sizes, twice for larger containers. A final pinching 8 to 10 weeks before flowering will help to increase flower count.

PGRs generally not needed

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

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

Recommended PGRs generally not needed

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

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

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

6-8 wks

9-11 wks

10-12 wks

10-12 in. (25-30 cm)

5-9

Year round, depending on location

Typically not required

PGRs generally not needed

Not particularly sensitive. Use well- drained media.

FINISHING GUIDE | 153

Powered by