2024 Grower Success Guide | Americas

PERENNIALS | SEED PROPAGATION

Erysimum hybridum Wallflower CANARIES ™

GERMINATION TEMPERATURE

PRODUCT FORM

HARDINESS USDA ZONE

BLOOMING SEASON

RECOMMENDED TRAY SIZE

SEEDS PER PLUG

SEED COVER

ADT

MEDIA PH / EC

STAGE 1 & 2

STAGE 3 & 4

Raw

4– 8

Early Spring

288-cell tray

1–2

No Cover

68–72° F (20–22° C)

65–70° F (18–21° C)

66 °F (19 °C)

pH: 5.5–5.9 SME 0.25–0.5 mS/cm

Heuchera americana Coral Bells MARVELOUS MARBLE ™

GERMINATION TEMPERATURE

PRODUCT FORM

HARDINESS USDA ZONE

BLOOMING SEASON

RECOMMENDED TRAY SIZE

SEEDS PER PLUG

SEED COVER

ADT

MEDIA PH / EC

STAGE 1 & 2

STAGE 3 & 4

Raw

3–9

Spring

288-cell tray

4–6

No Cover/Light Cover

65–72° F (18–22° C)

64–68° F (18–20° C)

68 °F (20 °C)

pH: 5.8–6.2 SME 0.25–0.5 mS/cm

Hibiscus moscheutos Swamp Rose Mallow HONEYMOON ™

GERMINATION TEMPERATURE

PRODUCT FORM

HARDINESS USDA ZONE

BLOOMING SEASON

RECOMMENDED TRAY SIZE

SEEDS PER PLUG

SEED COVER

ADT

MEDIA PH / EC

STAGE 1 & 2

STAGE 3 & 4

Raw

4–10

Summer– Fall

200-cell tray

1

Yes

See ADT

See ADT

68 °F (20 °C)

pH: 5.5–5.9 SME 0.5–0.75 mS/cm

Iberis sempervirens Candy Tuft WHISTLER ™

GERMINATION TEMPERATURE

PRODUCT FORM

HARDINESS USDA ZONE

BLOOMING SEASON

RECOMMENDED TRAY SIZE

SEEDS PER PLUG

SEED COVER

ADT

MEDIA PH / EC

STAGE 1 & 2

STAGE 3 & 4

Raw

3–9

Early Spring

288-cell tray

3–4

Yes

60–65° F (15–18° C)

60–65° F (15–18° C)

63 °F (17 °C)

pH: 5.5–5.9 SME 0.5–0.75 mS/cm

Lavandula angustifola English Lavender SCENT ™

GERMINATION TEMPERATURE

PRODUCT FORM

HARDINESS USDA ZONE

BLOOMING SEASON

RECOMMENDED TRAY SIZE

SEEDS PER PLUG

SEED COVER

ADT

MEDIA PH / EC

STAGE 1 & 2

STAGE 3 & 4

Raw

5–9

Spring– Summer 288-cell tray

2–3

Yes

65–72° F (18–22° C)

65–72° F (18–22° C)

65 °F (19 °C)

pH: 5.8–6.2 SME 0.5–0.75 mS/cm

Lavandula stoechas Spanish Lavender CASTILLIANO 2.0 ™

GERMINATION TEMPERATURE

PRODUCT FORM

HARDINESS USDA ZONE

BLOOMING SEASON

RECOMMENDED TRAY SIZE

SEEDS PER PLUG

SEED COVER

ADT

MEDIA PH / EC

STAGE 1 & 2

STAGE 3 & 4

Raw

7–9

Spring– Summer 288-cell tray

2–3

No

See ADT

See ADT

68° F (20° C)

pH: 5.5–5.9 SME 0.5–0.75 mS/cm

Lavandula stoechas Spanish Lavender VIOLETA ™ XL

GERMINATION TEMPERATURE

PRODUCT FORM

HARDINESS USDA ZONE

BLOOMING SEASON

RECOMMENDED TRAY SIZE

SEEDS PER PLUG

SEED COVER

ADT

MEDIA PH / EC

STAGE 1 & 2

STAGE 3 & 4

Raw

7–9

Early Spring– Fall

288-cell tray

2–3

Yes

65–72° F (18–22° C)

65–72° F (18–22° C)

65 °F (19° C)

pH: 5.8–6.2 SME 0.5–0.75 mS/cm

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