Delphinium 2021 Tech Guide

SOLUT I ON STARTER

DELPHINIUM

Liner Size: 72-Cell Availability: Spr ing and Fall 2021 Hardiness Zone: 3-9 Growing Temps: 60- 80°F day / 45- 50°F night Exposure: Full Sun Average Finishing Time: 10-12 weeks for 1 to 3 gallon when spring planted

2021

DELPHINIUM DELGENIUS™ TECHNICAL GUIDE

SOLUT I ON STARTER

PROGRAM SPOTLIGHT Trade Name: Delphinium Delgenius™ | Scientific Name: Delphinium x hybridus Liner Specs: 72-Cell

PROGRAM AT A GLANCE

Var i e ty

Habi t

Recommended Pot Size

Flower Color

Flowering Time

Short Compact

1 Gallon-3 Gallon

Purple-Blue

10-13Weeks

BREEZ I N

Royal Blue with White Bee

Short Compact

1 Gallon-3 Gallon

14-16Weeks

GL I TZY

13-15Weeks

Short Compact

1 Gallon-3 Gallon

Mauve-Pink

JULL I ETTE

Short Compact

1 Gallon-3 Gallon

Light Lavender

14-16Weeks

SHELBY

*Growers should use the information presented here as a guideline only. Flower times might vary due to winter temperatures. Colder growing temperatures will lead to later flowering.

GROWER TIPS

• The Delphinium Delgenius program at PP&L is offered in a 72 cell size from tissue culture. Due to their fast and strong growth, we recommend larger pot sizes between 1.5-gallon and 3-gallon, only 1 liner per pot is needed. • Delgenius need a higher Phosphorus rate compared to most perennials, Phosphorus is important for producing side shoots and more blooms.The best ratio of P to K for growing Delgenius is 1:2 to 1:2.5. • Delgenius should be grown at a pH between 5.4-5.5 and never above 6.0. A high pH will make Phosphorus less available meaning less side shoots and production of a single bloom vs the multiple blooms Delgenius is capable of. • It takes approximately 12-16 weeks to get a finished plant after spring planting, depending on climate. Best spring planting time is April-May for summer flowering. Liners can also be planted August- September and overwintered for early spring flowering.

• Delgenius are heavy feeders, use a liquid feed on top of a slow release fertilizer. EC levels should be kept at 1.5, it is important to keep a watch on the fertilizer level in the soil when the flower stems/buds start to appear. If levels are lower than 1.5, plants need additional fertilizer at that point. • Delgenius are fast-growing plants, therefore they need spacing for the best quality finish. Plants can be spaced after planting to their final spacing or wait till buds start to appear but no later. • If you have any questions, please do not hesitate to contact us, preferably with pictures so we can better help you grow the best crop possible.

SOLUT I ON STARTER

PROGRAM SPOTLIGHT Trade Name: Delphinium Delgenius™ | Scientific Name: Delphinium x hybridus Liner Specs: 72-Cell

VARIETIES

EXPOSURE

Delgenius grow best outdoors in full sun.

TEMPERATURE Delgenius are very tough plants and selected for their hardiness and heat tolerance.They are hardy to USDA Zone 3 and can stand temperatures over 104ºF/40ºC.Young plants are produced from tissue culture and cannot stand frost or night frost.Therefore, a later planting in spring is advised. Early planting in a greenhouse is possible but as soon as the plant starts growing they need to go outside, otherwise they will stretch and become too tall.

DELGENIUS™ BREEZIN

DELGENIUS™ GLITZY

DELGENIUS™ JULLIETTE

DELGENIUS™ SHELBY

Delphinium Delgenius™ Technical Guide 2021

FERTILIZATION & IRRIGATION GUIDELINES

• Delgenius are strong and fast-growing plants, therefore they require quite a lot of fertilizer. A base start of slow release fertilizer is recommended. In addition, you must liquid feed continuously.The recommended EC level in the soil is around 1.5 EC, measured with a 1.5-1 method. For those using the AM measuring method, we advise an AM between 0.35 and 0.45 in the soil. • The best ratio between P and K is between 1:2 – 1:2.5.This requires a liquid feeding on top of the base slow release fertilizer (which is mostly P:K 1:3 or 1:4) of 20-20-20 or 27-15-12 with microelements. • You can water these plants during day or night.The best time is in early morning, but they are not picky.These Delgenius make a huge leaf rosette, different than normal Delphiniums, and the leaves should be dark green.A lighter color means there is an incorrect balance in fertilizer or that it is too low in fertilizer.When the plants are low in fertilizer for a long period of time, they will discard their lower leaves. If fertilizer levels are too high, the edges of the leaves will scorch. • Even when they flower, the leaves do not disappear like a normal Delphinium, but stay on the plant, making the display extra attractive!

TECHNICAL GROWING INFORMATION

Do not treat these as normal Delphinium and start using growth regulators.This will destroy the habit of the Delgenius. Use a very open, well-drained soil with a pH of 5,4- 5,5. If possible, a very open peat mix or very good quality bark/peat mix. Pure bark is not recommended because the bark is typically poorly decomposed and will absorb much of nitrogen from the soil.These Delgenius types are sensitive for low nitrogen levels in the soil.We advise to use a base slow release fertilizer in the soil to make sure there is always enough fertilizer available. On the side, use liquid fertilizers to top up. Delgenius will be delivered as a rooted plug, ready for planting. Plant the plug at the same depth, not deeper. Delgenius doesn’t like to get deeper in the soil. Fill the pot with an extra pile of soil and press gently so the soil will not shrink too much. Make sure the pot is filled to the top. Place the pots outside in full sun. Make sure the container field is well drained. Delgenius doesn’t like to stand in a puddle of water.

PLANT I NG

For a 1.5-gallon pot, use 4-inch spacing between the pots, and for a 2- or 3-gallon pot, use 5-inch spacing between the pots.

SPAC I NG

pH is very important for Delgenius.A pH above 6 slows down the uptake of phosphates and makes the uptake of Potassium easy for the plant. Phosphates are necessary for the initiation of side shoots on a plant and also for creating extra flower stems. Potassium makes the cell structure strong, initiating flowers, but is against the forming of side shoots. Hence the problem if the pH gets above 6: no or less side shoots, and you get a single stem flower! Delgenius will make side shoots naturally, so pinching is not necessary and not needed after planting.When the plant is in full flower or out of flower and not sold, you can pinch the flower stems back to 1 inch above the soil.This will initiate new side shoots and these will become new flower shoots.When this plant is in a 1.5-gallon pot, it is recommended to replant it in a 2- or even 3-gallon pot. Delgenius are very strong and can stand temperatures till 5ºF/-20ºC, however above the soil in a potted plant is always more vulnerable to frost and windy conditions than when covered. Because it is a high value crop, we advise to overwinter them in a cold greenhouse or cold hoop house. It is most important to avoid extreme wet conditions. Open the greenhouse to vent when there is no frost.Avoid growing early in the season because the temperature rises in the greenhouse.

pH

P I NCH I NG

OVERWI NTER I NG

Delgenius are very strong and selected for disease tolerance.While Delphinium are less sensitive to it, when the humidity rises and temperatures warm, there is always a chance of powdery mildew.Aphids and white flies are always possible, keep a close eye on them. When the leaves start to color or get light in color (even sometimes yellow), check the pH, nitrogen and phosphate levels.

DISEASE

Delphinium Delgenius™ Technical Guide 2021

P L A N T H O L O G Y

BROUGHT TO YOU BY

Pacic Plug & Liner

N O . 9

750 Casserly Road / Watsonville, CA 95076 / 831.768.6300 find out more at ppandl.com

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