2026-2028 Grower Success Guide

PERENNIALS | SEED PROPAGATION

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 angustifolia 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

Primed

5–9

Spring–Summer 288-cell tray

2–3

Yes

65–72 °F (18–22 °C)

65–72 °F (18–22 °C)

65 °F (18 °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 Cover

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 (18 °C)

pH: 5.8–6.2 SME 0.5–0.75 mS/cm

Papaver nudicaule Iceland Poppy SPRING FEVER ®

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

3–7

Early Spring–Spring

288-cell tray

3

No Cover

66–72 °F (19–22 °C)

66–72 °F (19–22 °C)

62 °F (17 °C)

pH: 5.5–5.9 SME 0.5–0.75 mS/cm

Platycodon grandiflorus Balloon Flower TWINKLE ™

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

3–8

Spring–Summer 288-cell tray

3–4

No Cover

See ADT

See ADT

62 °F (17 °C)

pH: 5.5–5.9 SME 0.5–0.75 mS/cm

Pritzelago alpina Chamois Cress ICECUBE ™

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–Spring

288-cell tray

3–4

Yes

See ADT

See ADT

63 °F (17.5 °C)

pH: 5.8–6.2 SME 0.5–0.75 mS/cm

Salvia x superba Salvia MERLEAU ®

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

4–9

Spring–Summer 288-cell tray

2–3

No Cover

62–68 °F (16–20 °C)

64–68 °F (18–20 °C)

68 °F (20 °C)

pH: 5.8–6.2 SME 0.5–0.75 mS/cm

98

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