2025 Perennials | AMS | Culture Guides

All culture guides for 2025 perennial introductions.

Arielle ™ Pink

Iberis Arielle ™ Culture Guide Botanical name: Iberis x hybrida Product form: URC Containers: Quarts, Gallons Habit: Mounding Vernalization: Not required (First Year Flowering) Garden Specifications Garden height: 8–12” (20–30 cm) tall Garden width: 8–12” (20–30 cm) wide Exposure: Part Shade–Full sun USDA zone: 5–9 AHS zone: 9–4 Product use: Containers, Landscapes Propagation of Unrooted Cuttings Root emergence: 7–10 days Rooting hormone: Recommended. A water soluble K-IBA basal dip at 250–300 ppm at sticking has been shown to hasten rooting. Bottom heat temperature: 70–72 °F (21–22 °C) for the first three weeks. After roots are well developed, temperatures can be lowered to hold and tone the cuttings. Misting: Mist schedules vary depending on light and temperature conditions. Apply just enough moisture to rehydrate the cuttings and keep them from wilting. Cuttings should be hydrated and in a non-wilted stage within 24 hours after sticking. Cuttings that continue to wilt heavily after 24 hours will callus unevenly and will be delayed in rooting. CapSil ® (spray adjuvant) can be sprayed on the cuttings at a rate of 2–4 oz/100 gal within 1–2 days after sticking to help in rehydration of the cuttings. Misting should be significantly reduced after 3–4 days and after cuttings become fully hydrated. Recommended tray size: 30 mm (105-cell) or larger Propagation timing: 4-5 weeks for a 30 mm (105-cell) tray; add more rooting time for significantly larger plug sizes. Temperature

Arielle ™ Pink

Day length response: Day neutral Daily light integral: 4–6 mol·m -2 ·d -1 for the first two weeks after sticking or until root development occurs. DLI can be increased to greater than 12 mol·m -2 ·d -1 after root formation. Media pH: 5.8–6.2 Media EC: SME EC: 0.9–1.3 mS/cm, Press/Squeeze Method EC: 1.4–2.0 mS/cm Fertilizer: Begin fertilization at 50 ppm nitrogen when roots become visible. Rates can be increased up to 75 ppm nitrogen after roots become well developed. Use primarily Cal-Mag ® Plus (calcium nitrate + magnesium nitrate + iron) fertilizers in propagation to prevent unwanted stretch. Pinching: Optional Plant growth regulators (PGRs): Not necessary Bulking and Vernalization Vernalization: Not required (First Year Flowering) Finishing Temperature

Day: 54–56 °F (12–13 °C) Night: 48–50 °F (9–10 °C) Average daily temperature: 52 °F (11 °C) Lighting Day extension lighting: Not necessary Light intensity: 400–800 µmol·m -2 ·s -1 Day length response: Day neutral Daily light integral: 8–10 mol·m -2 ·d -1

Day: 66–68 °F (19–20 °C) Night: 64–66 °F (18–19 °C) Lighting Day extension lighting: Not necessary

Light intensity: 200–250 µmol·m -2 ·s -1 for the first two weeks after sticking or until root development occurs. Light levels can be increased up to 600 µmol·m -2 ·s -1 as rooting increases and the cutting matures.

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Arielle ™ Pink

Scheduling Size

Transplanting: Transplant directly into the finished container. Place the rooting media level with the height of the media in the container. Make sure that the root ball is covered and that the plug is situated in the center of the pot. Media pH: 5.8–6.2 Media EC: SME EC: 1.5–2.1 mS/cm, PourThru EC: 2.3–3.2 mS/cm Fertilizer: 125–175 ppm N Pinching: Optional Plant growth regulators (PGRs): Up until flower production PGRs are normally not necessary. To hold size use a Bonzi ® drench at 1-3 ppm at visible buds. Tech tip: Arielle ™ Iberis does not require require vernalization to flower, but can be grown cold for early spring sales. Bulk plants for 6–7 weeks at an ADT of 68 °F (20 °C) prior to dropping the temperature to 45 °F (7 °C) for 6–7 weeks. Then allow natural longer days and increased temperatures to induce flowering.

Crop Time Plants Per Pot 8–10 weeks 1–2 ppp

1.25 to 2.5 quart (5.5 to 6.5 inch, trade gallon) 3.0 quart to 2.0 gallon (7.5 to 10 inch)

10–12 weeks 2–3 ppp

Estimated finish crop time is from transplant of a 105-cell tray and finished at an average daily temperature (ADT) of 52 °F (11 °C). Example crop schedule for a 2.5 quart Weeks From Transplant Description 1 week Transplant liner into the center of the container 3 weeks

Closely monitor irrigation. If plants are allowed to wilt it will increase the risk of lower leaf drop After ensuring that flowers have been initiated, if needed, apply a Bonzi ® drench at 2 ppm to control stretch

6 weeks

Try Chrysal Alesco ® , a postharvest foliar spray, to protect ethylene sensitive crops during shipping and retail.

8 weeks

Finish

Moisture level: Media should be allowed to dry between irrigations. Alternate between moisture level 2 and 3. 2 - MEDIUM: Soil is light brown in color, no water can be extracted from soil, and soil will crumble apart. 3 - MOIST: Soil is brown in color, strongly squeezing the soil will extract a few drops of water, and trays are light with no visible bend. Common pests: Aphids, Thrips, Spider Mites Common diseases: Downy Mildew, Powdery Mildew

Arielle ™ Pink

All photos are either the property of Syngenta or are used with permission. These materials are being distributed to you for information purposes only and for your private use. While every effort has been made to ensure the accuracy and reliability of the information and formulas, no guarantee is given or responsibility taken by Syngenta for the accuracy of the materials or the applicability to your particular circumstances. Reliance upon this information is at user’s sole risk and Syngenta expressly disclaims any and all liability in connection with this advice. © 2024 Syngenta. Important: Always read and follow label instructions. Some products may not be registered for sale or use in all states or counties. Please check with your local Extension Service to ensure registration status. Some or all of the varieties may be protected under one or more of the following: Plant Variety Protection, United States Plant Patents and/or Utility Patents and may not be propagated or reproduced without authorization. Trademarks are the property of their respective owners.

Dottie ™ White

Digitalis Dottie ™ Culture Guide Botanical name: Digitalis purpurea Product form: Seed Containers: Gallons Habit: Upright Vernalization: Not required (First Year Flowering) Garden Specifications Garden height: 16–20” (40–50 cm) tall Garden width: 12–14” (30–35 cm) wide Exposure: Part shade–Full sun USDA zone: 5–9 AHS zone: 9–1 Product use: Containers, Landscapes, Patio Pots Germination Stages 1 & 2 Germination time: 3–4 days Media temperature: 65–70 °F (18–21 °C) Chamber: Optional Light: Required for germination Seed cover: No Moisture level: 4 - WET: Soil is dark brown but not shiny, no free water is seen at the surface of the soil, when pressed or squeezed water drips easily, and trays are heavy with a visible bend in the middle. Recommended tray size: 288–cell tray Seeds per cell: 1–2 Young Plant Production Stage 3 & 4 Temperature

Dottie ™ Warm Rose

Fertilizer: 75–100 ppm N Moisture level: Media should be allowed to dry between irrigations. Alternate between moisture level 3 and 4. 2 - MEDIUM: Soil is light brown in color, no water can be extracted from soil, and soil will crumble apart. 3 - MOIST: Soil is brown in color, strongly squeezing the soil will extract a few drops of water, and trays are light with no visible bend. Pinching: No Plant growth regulators (PGRs): If necessary, plants will respond to sprays of B-Nine ® WSG (daminozide) at 2,000 ppm, or a Bonzi ® (paclobutrazol) spray at 5 ppm. Plug grow time: 4–5 weeks in a 288–cell tray Comments: No vernalization required. Although, Dottie ™ digitalis can be transplanted in late summer–early fall for faster flowering in the following year. Bulking and Vernalization Vernalization: Not required (First year flowering) Finishing Temperature Day: 68–70 °F (20–21 °C) Night: 64–66 °F (18–19 °C) Average daily temperature: 66 °F (19 °C) Lighting

Day: 64–66 °F (18–19 °C) Night: 60–62 °F (16–17 °C) Average daily temperature: 62 °F (17 °C) Lighting Day extension lighting: Not necessary

Light intensity: 200–250 µmol·m -2 ·s -1 for the first two weeks after sowing or until true leaf development occurs. Light levels can be increased up to 600 µmol·m -2 ·s -1 as rooting increases and the seedling matures. Day length response: Obligate long day Daily light integral: 10–12 mol·m -2 ·d -1 Media pH: 5.8–6.2 Media EC: SME EC 0.5 to 0.75 mS/cm or Press/Squeeze Method EC 0.75 to 1.1 mS/cm

Day extension lighting: Not necessary Light intensity: 1,200–1,600 µmol·m -2 ·s -1 Day length response: Obligate long day Daily light integral: 14–16 mol·m -2 ·d -1

www.thinkplants.com

Dottie ™ Purple

Transplanting: Transplant directly into the finished container. Place the rooting media slightly above the level of media in the container. Make sure that the root ball is covered and that the plug is situated in the center of the pot. Do not cover the crown of the plant as this is the active growing point. Media pH: 5.8–6.2 Media EC: SME EC: 0.9–1.3 mS/cm, PourThru EC: 1.4–2.0 mS/cm Fertilizer: 100–150 ppm N Pinching: No. Pinching is not recommended or needed. Plant growth regulators (PGRs): Sprays of B-Nine ® WSG at 2,500-3,500 ppm, or Bonzi ® at 5-10 ppm are effective to control height. Apply PGRs before flower spike begins to elongate. Drench with Bonzi ® at 2–4 ppm to hold plants for sale. Tech tip: Plants grown in the greenhouse with additional lights exhibited stretched habits and loose flower spikes. Crops grown cool in protected cold frames will produce compact plants with good lateral development of secondary spikes.

Scheduling Size

Crop Time Plants Per Pot 11–12 weeks 1 ppp

1.0 quart (4.5 to 5 inch)

1.25 to 2.5 quart (5.5 to 6.5 inch, trade gallon)

11–12 weeks 1–2 ppp

Estimated finish crop time is from transplant of a 288-cell tray and finished at an average daily temperature (ADT) of 62 °F (17 °C). Example crop schedule for a 2.5 quart Weeks From Transplant Description 1 week Transplant 1–2 plugs into the center of the container. 4 weeks

Feed continually, and increase feed with increasing light intensity. Digitalis also benefit from additional iron and calcium during production. Avoid ammonium levels above 20% to reduce the need for extra PGR applications. Apply a Bonzi ® drench to tone the plant and control height.

8 weeks

Try Chrysal Alesco ® , a postharvest foliar spray, to protect ethylene sensitive crops during shipping and retail.

12 weeks

Finish

Moisture level: Media should be allowed to dry between irrigations. Alternate between moisture level 2 and 4. 2 - MEDIUM: Soil is light brown in color, no water can be extracted from soil, and soil will crumble apart. 4 - WET: Soil is dark brown but not shiny, no free water is seen at the surface of the soil, when pressed or squeezed water drips easily, and trays are heavy with a visible bend in the middle. Common pests: Aphids, leafminers, whiteflies, thrips Common diseases: Botrytis, downy mildew

Dottie ™ Peach

Snow Dome™

Iberis Snow Dome ™ Culture Guide Botanical name: Iberis sempervirens Product form: URC Containers: Quarts, Gallons Habit: Mounding

Snow Dome™

Snowsurfer™ Forte

Vernalization: Required Garden Specifications

Garden height: 6–10” (15–25 cm) tall Garden width: 10–12” (25–30 cm) wide Exposure: Part Sun–Full sun USDA zone: 4–8 AHS zone: 8–1 Product use: Containers, Landscapes, Combos Propagation of Unrooted Cuttings Root emergence: 10–12 days

Rooting hormone: Recommended. A K-IBA basal dip at 250–300 ppm at sticking has been shown to hasten rooting. Bottom heat temperature: 70–72 °F (21–22 °C) for the first three weeks. After roots are well developed, temperatures can be lowered to hold and tone the cuttings. Misting: Mist schedules vary depending on light and temperature conditions. Apply just enough moisture to rehydrate the cuttings and keep them from wilting. Cuttings should be hydrated and in a non-wilted stage within 24 hours after sticking. Cuttings that continue to wilt heavily after 24 hours will callus unevenly and will be delayed in rooting. CapSil ® (spray adjuvant) can be sprayed on the cuttings at a rate of 2–4 oz/100 gal within 1–2 days after sticking to help in rehydration of the cuttings. Misting should be significantly reduced after 3–4 days and after cuttings become fully hydrated. Recommended tray size: 30 mm (105-cell) or larger Propagation timing: 7-8 weeks for a 30 mm (105-cell) tray; add more rooting time for significantly larger plug sizes. Temperature

Daily light integral: 4–6 mol·m -2 ·d -1 for the first two weeks after sticking or until root development occurs. DLI can be increased to greater than 12 mol·m -2 ·d -1 after root formation. Media pH: 5.6–6.0 Media EC: SME EC: 0.9–1.3 mS/cm, Press/Squeeze Method EC: 1.4–2.0 mS/cm Fertilizer: Begin fertilization at 80 ppm nitrogen when roots become visible. Rates can be increased up to 150 ppm nitrogen after roots become well developed. Use primarily Cal-Mag ® Plus (calcium nitrate + magnesium nitrate + iron) fertilizers in propagation to prevent unwanted stretch. Pinching: Recommended Plant growth regulators (PGRs): Not necessary Bulking and Vernalization Vernalization: Required Bulking Bulking Time: See Scheduling Section Temperature: 64–66 °F (18–19 °C) Pinch: No PGR: Not necessary Vernalization Vernalization Time: 7–8 weeks Temperature: 37–40 °F (3–4 °C) Tech tip: Avoid pinching after the first week in September to avoid cutting off the next years flowers.

Day: 70–72 °F (21–22 °C) Night: 66–68 °F (19–20 °C) Lighting Day extension lighting: Not necessary

www.thinkplants.com

Snow Dome™

Finishing Temperature

Scheduling

Crop Time

Plants Per

Day: 68–70 °F (20–21 °C) Night: 58–60 °F (14–16 °C) Average daily temperature: 64 °F (18 °C) Lighting Day extension lighting: Not necessary Light intensity: 1,200–1,600 µmol·m -2 ·s -1 Day length response: Day neutral Daily light integral: 12–14 mol·m -2 ·d -1 Transplanting: Transplant directly into the finished container. Place the rooting media level with the height of the media in the container. Make sure that the root ball is covered and that the plug is situated in the center of the pot. Media pH: 5.8–6.2 Media EC: SME EC: 1.5–2.1 mS/cm, PourThru EC: 2.3–3.2 mS/cm Fertilizer: 75–125 ppm N Pinching: Yes, a pinch is recommended either in propagation or 7–10 days after transplant. Plant growth regulators (PGRs): Up until flower production, PGRs are normally not necessary. At visible bud use a Bonzi ® drench at 3–5 ppm or spray at 30 ppm to hold size. Tech tip: Snow Dome ™ flowers mid-late spring, timing between Snowsurfer ™ Forte and Snowdrift ™ .

Size

Pot Bulk Vern. Finish

1.0 quart (4.5 to 5 inch)

7–8 weeks 8–10 weeks

7–8 weeks 7–8 weeks

5–6 weeks 6–7 weeks

1 ppp

1.25 to 2.5 quart (5.5 to 6.5 inch, trade gallon)

1 ppp

Estimated finish crop time is from transplant of a 105-cell tray and finished at an average daily temperature (ADT) of 64 °F (18 °C). Example crop schedule for a 2.5 quart Weeks From Transplant Description 1 week Transplant one pre-pinched liner into the center of the pot 2 weeks If not pinched in propagation, pinch to 4–6 leaf nodes 8 weeks This is the end of the bulking period. Start to reduce temperatures and start the

vernalization process. While water use will be reduced, do not allow to wilt during this time. If the plants are grown to dry the risk of losing lower leaves increases. At this time the plants have received enough cold. Start to increase temperatures and force into flower. If needed, a Bonzi ® drench at 3–5 ppm can be applied to hold the crop. Crop is in full color. Plants continue to bloom for up to 4 weeks.

15 weeks

18 weeks

Try Chrysal Alesco ® , a postharvest foliar spray, to protect ethylene sensitive crops during shipping and retail.

21 weeks

Snow Dome™

Surrender™ Rose Imp.

Sedum Surrender ™ Culture Guide Botanical name: Sedum telephium Product form: Seed Containers: Quarts, Gallons Habit: Upright

Vernalization: Not required Garden Specifications Garden height: 10–16” (25–40 cm) tall Garden width: 5–7” (12–18 cm) wide

Exposure: Full sun USDA zone: 4–9 AHS zone: 9–1 Product use: Containers, Mass Plantings, Patio Pots, Combinations Germination Stages 1 & 2 Germination time: 14–21 days Media temperature: 65–72 °F (18–22 °C) Chamber: No Light: Required for germination Seed cover: No Moisture level: 4 - WET: Soil is dark brown but not shiny, no free water is seen at the surface of the soil, when pressed or squeezed water drips easily, and trays are heavy with a visible bend in the middle. Recommended tray size: 288–cell tray Seeds per cell: 3–4 Young Plant Production Stage 3 & 4 Temperature Day: 70–72 °F (21–22 °C) Night: 64–66 °F (18–19 °C) Average daily temperature: 65–70 °F (18–21 °C) Lighting Day extension lighting: Not necessary Light intensity: 400–600 µmol·m -2 ·s -1 Day length response: Obligate long day Daily light integral: 8–10 mol·m -2 ·d -1 Media pH: 5.8–6.2 Media EC: SME 0.5 to 0.75 mS/cm or Press/Squeeze Method EC 0.75 to 1.1 mS/cm Fertilizer: 50–75 ppm N

Surrender™ Rose Imp.

Moisture level: Once cotyledons are fully open, dry the media down between irrigations to improve rooting, but avoid wilting. Alternate between moisture level 3 and 4. 3 - MOIST: Soil is brown in color, strongly squeezing the soil will extract a few drops of water, and trays are light with no visible bend. 4 - WET: Soil is dark brown but not shiny, no free water is seen at the surface of the soil, when pressed or squeezed water drips easily, and trays are heavy with a visible bend in the middle. Pinching: No Plant growth regulators (PGRs): PGRs generally should not be required. Plug grow time: 7–8 weeks Comments: Avoid excessive, free moisture in propagation with Surrender. Sedum telephium is sensitive to high salt levels and high ammonium levels. Use primarily Cal-Mag ® Plus (calcium nitrate + magnesium nitrate) fertilizers in propagation. Bulking and Vernalization Vernalization: Not required (First year flowering) Finishing Temperature Day: 74–76 °F (23–24 °C) Night: 64–66 °F (18–19 °C) Average daily temperature: 68–70 °F (20–21 °C)

www.thinkplants.com

Surrender™ Rose Imp.

Scheduling Size

Lighting Day extension lighting: Necessary to 14 hours Light intensity: 1,200–1,600 µmol·m -2 ·s -1 Day length response: Obligate long day Daily light integral: 14–16 mol·m -2 ·d -1 Transplanting: Transplant directly into the finished container. Place the rooting media slightly above the level of media in the container. Sedum do not survive well if the crown is buried. Media pH: 5.8–6.2 Media EC: SME EC: 0.9–1.3 mS/cm, PourThru EC: 1.4–2.0 mS/cm Fertilizer: 75–125 ppm N Pinching: Surrender is very well branched, therefore no pinch is required. Plant growth regulators (PGRs): Growth regulators are not generally required for this well-branched seed sedum. Sprays of B-Nine ® WSG at 2,500-5,000 ppm can be utilized to control growth or Bonzi ® sprays at 5 to 15 ppm can also be applied; however if Surrender is grown dry, PGRs may not be required. Tech tip: Vernalization is not required for this first year flowering, perennial sedum. Moisture level: Media should be allowed to dry between irrigations. Alternate between moisture level 2 and 3. 2 - MEDIUM: Soil is light brown in color, no water can be extracted from soil, and soil will crumble apart. 3 - MOIST: Soil is brown in color, strongly squeezing the soil will extract a few drops of water, and trays are light with no visible bend. Common pests: Aphids, whiteflies Common diseases: Botrytis , powdery mildew, Fusarium , Rhizoctonia , and Colletotrichum stem rot

Crop Time Plants Per Pot

1.0 quart (4.5 to 5 inch)

13–15 weeks

1 ppp

1.25 to 2.5 quart (5.5 to 6.5 inch, trade gallon) 2–3 ppp Estimated finish crop time is from transplant of a 288-cell tray and finished 13–15 weeks at an average daily temperature (ADT) of 69 °F (20.5 °C). Example crop schedule for a 1.25 quart Weeks From Transplant Description 2 weeks

Apply broad spectrum root and shoot fungicide protectants, along with a systemic insecticide for pest control. Evaluate plants for growth control and apply B-Nine ® WSG or Bonzi ® sprays if needed to maintain habit and growth. Re-apply broad spectrum root and shoot fungicide protectants, along with a systemic insecticide for pest control.

7 weeks

10 weeks

14 weeks

Finish

Surrender™ Rose Imp.

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