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Trial Garden 2018

Bed Preparation and Planting

A 10,000 sq. ft. area behind the Fisher Greenhouse was rototilled in the spring before planting. The soil was not amended, and the beds were mulched prior to planting with a 3-inch layer of wood chips.

Staff and volunteers planted the selections on May 24th. Seven plants of each variety were planted 1 ft. apart in rows, with 24 or 36-inch spacing between rows depending upon cultivar. The rows were organized into seven 8 ft. by 100 ft. beds.

The plant selections were organized in alphabetical order according to their botanical name, and identified by white labels listing their botanical name, cultivar, and supplier.

Maintenance

Once established, the Trial Garden received minimal maintenance. Staff irrigated the beds for the first two weeks, and applied an all-purpose soluble fertilizer (21-5-20) at planting and for the first two weeks. No supplemental watering or fertilizer was provided for the remainder of the summer, nor were insecticides or fungicides applied. Staff hand weeded as necessary. None of the trial plants were dead-headed or pruned.

Evaluations

The Horticulture Manager at UDBG evaluated the Trial Garden plants every other week from June 29 through September 28. For each of the dates, plants were awarded three scores: one based on flowering, one based on foliage, and this year we added one more category, habit. Habit evaluates how uniform the plants grow, if all 7 plants are different sizes, the score is lower, if they are all very close in size, they get a good score. Habit also takes into account how well the plant holds its form, does it splay in time? Or does it stand tall and keep form throughout the season? The overall scores for flowers and foliage represent the average of all individual scores for each category.

Weather

The following charts were generated from weather information obtained from Delaware Environmental Observing System Network at the UD Farm

 

 

Angelonia Angelface(R) Blue Imp Summer Snapdragon

Average flower score: 1.9


Average foliage score: 3.9


Light condition: Full Sun


Source: Proven Winners


Comments: 9/7 - Noticeable yellowing and mottled foliage


Flower and foliage scores by date:

Angelonia Angelface(R) Cascade Blue Summer Snapdragon

Average flower score: 1.6


Average foliage score: 3.6


Light condition: Full Sun


Source: Proven Winners


Comments: 8/10 - 3 died possibly due to drought conditions


Flower and foliage scores by date:

Angelonia Angelface(R) Cascade Pink Summer Snapdragon

Average flower score: 1.9


Average foliage score: 3.4


Light condition: Full Sun


Source: Proven WInners


Comments: 7/13 thru 8/10 leaves had noticeable burn, with the rain came a reflush of foliage


Flower and foliage scores by date:

Angelonia Angelface(R) Cascade White Summer Snapdragon

Average flower score: 2.0


Average foliage score: 3.6


Light condition: Full Sun


Source: Proven Winners


Comments: 7/27 - One plant died


Flower and foliage scores by date:

Angelonia Angelface(R) Steel Blue Summer Snapdragon

Average flower score: 2.6


Average foliage score: 3.9


Light condition: Full Sun


Source: Proven Winners


Comments: Best performing Angelonia from this year's trial


Flower and foliage scores by date:

Angelonia Angelface(R) Wedgewood Blue Imp Summer Snapdragon

Average flower score: 1.9


Average foliage score: 3.9


Light condition: Full Sun


Source: Proven Winners


Comments: 8/10 - Foliage Reflush after drought conditions


Flower and foliage scores by date:

Calibrachoa Superbells(R) Cardinal Star Million Bells

Average flower score: 3.0


Average foliage score: 2.7


Light condition: Full Sun


Source: Proven Winners


Comments: 6/29 - 1 dead


Flower and foliage scores by date:

Calibrachoa Superbells(R) Evening Star Imp Million Bells

Average flower score: 3.0


Average foliage score: 2.6


Light condition: Full Sun


Source: Proven Winners


Comments:


Flower and foliage scores by date:

Calibrachoa Superbells(R) Holy Smokes!(TM) Million Bells

Average flower score: 3.1


Average foliage score: 3.2


Light condition: Full Sun


Source: Proven Winners


Comments:


Flower and foliage scores by date:

Calibrachoa Superbells(R) Tangerine Punch(TM) Million Bells

Average flower score: 2.9


Average foliage score: 3.1


Light condition: Full Sun


Source: Proven Winners


Comments: 6/29 - 1 dead


Flower and foliage scores by date:

Calibrachoa Superbells Double(R) Chiffon(TM) Million Bells

Average flower score: 3.5


Average foliage score: 2.6


Light condition: Full Sun


Source: Proven Winners


Comments:


Flower and foliage scores by date:

Calibrachoa Superbells(R) Doublette Love Swept(TM) Million Bells

Average flower score: 2.6


Average foliage score: 2.9


Light condition: Full Sun


Source: Proven Winners


Comments: 6/29 - 1 dead 8/10 - 2 more dead


Flower and foliage scores by date:

Catharanthus rosesus Cora Cascade Shell Pink Vinca

Average flower score: 3.8


Average foliage score: 4.2


Light condition: Full Sun


Source: Proven Winners


Comments:


Flower and foliage scores by date:

Catharanthus rosesus Cora Cascade Violet Vinca

Average flower score: 3.9


Average foliage score: 4.2


Light condition: Full Sun


Source: Proven Winners


Comments:


Flower and foliage scores by date:

Calendula officinalis Lady Godiva Yellow English Marigold

Average flower score: 3.2


Average foliage score: 3.1


Light condition: Full Sun


Source: Proven Winners


Comments: 9/7 - Sharp decline in overall health of plant, great performer until then


Flower and foliage scores by date:

Dahlia Grande Merida Dahlia

Average flower score: 2.3


Average foliage score: 2.4


Light condition: Full Sun


Source: Proven Winners


Comments: 7/13 - 2 dead


Flower and foliage scores by date:

Dahlia Dalina Mini Malta Dahlia

Average flower score: 1.6


Average foliage score: 1.9


Light condition: Full Sun


Source: Proven Winners


Comments: 6/29 - 1 dead 7/27 - 2 more dead 9/28 - 2 more dead


Flower and foliage scores by date:

Euphorbia Diamond Frost(R) Euphorbia

Average flower score: 4.4


Average foliage score: 3.8


Light condition: Full Sun


Source: Proven Winners


Comments: Prone to splaying, best if propped up by another plant or hardscape


Flower and foliage scores by date:

Gomphrena Truffula(TM) Pink Globe Amaranth

Average flower score: 4.6


Average foliage score: 4.0


Light condition: Full Sun


Source: Proven Winners


Comments: Prone to splaying about mid season, otherwise great plant


Flower and foliage scores by date:

Hypoestes Hippo(TM) Pink Polka Dot Plant

Average flower score: N/A


Average foliage score: 4.9


Light condition: Full Sun


Source: Proven Winners


Comments:


Flower and foliage scores by date:

Hypoestes Hippo(TM) White Polka Dot Plant

Average flower score: N/A


Average foliage score: 4.8


Light condition: Full Sun


Source: Proven Winners


Comments:


Flower and foliage scores by date:

Impatiens xhawkeri Sunpatiens Compact Purple Impatiens

Average flower score: 3.4


Average foliage score: 4.0


Light condition: Full Sun


Source: Proven Winners


Comments: 8/10 - Slight Leaf Burn


Flower and foliage scores by date:

Ipomoea Sweet Caroline Kiwi Ornamental Sweet Potato

Average flower score: N/A


Average foliage score: 4.4


Light condition: Full Sun


Source: Proven Winners


Comments: 6/29 through 7/27 - Insect Damage


Flower and foliage scores by date:

Ipomoea Sweet Caroline Raven Imp Ornamental Sweet Potato

Average flower score: N/A


Average foliage score: 4.5


Light condition: Full Sun


Source: Proven Winners


Comments:


Flower and foliage scores by date:

Lantana Luscious(R) Citrus Blend Imp Lantana

Average flower score: 4.3


Average foliage score: 4.2


Light condition: Full Sun


Source: Proven Winners


Comments: Flower Color varies over the summer


Flower and foliage scores by date:

Ocimum Amazel(TM) Basil

Average flower score: 1.8


Average foliage score: 3.9


Light condition: Full Sun


Source: Proven Winners


Comments: 7/27 through rest of season, splaying


Flower and foliage scores by date:

Osteospermum Bright Lights(R) Pink African Daisy

Average flower score: 1.7


Average foliage score: 2.0


Light condition: Full Sun


Source: Proven Winners


Comments: 9/7 - 2 Dead


Flower and foliage scores by date:

Petunia Supertunia Vista(R) Paradise Petunia

Average flower score: 3.8


Average foliage score: 2.9


Light condition: Full Sun


Source: Proven Winners


Comments: Performed well in dryer conditions


Flower and foliage scores by date:

Petunia Supertunia(R) White Charm Petunia

Average flower score: 3.8


Average foliage score: 2.7


Light condition: Full Sun


Source: Proven Winners


Comments: Performed well in dryer conditions


Flower and foliage scores by date:

Petunia Supertunia(R) Blue Skies Petunia

Average flower score: 3.6


Average foliage score: 2.5


Light condition: Full Sun


Source: Proven Winners


Comments:


Flower and foliage scores by date:

Ruellia Machu(TM) Morado Mexican Petunia

Average flower score: 2.8


Average foliage score: 3.9


Light condition: Full Sun


Source: Proven Winners


Comments: 8/10 - Heat Stress


Flower and foliage scores by date:

Salvia Rockin'(TM) Fuschia Sage

Average flower score: 2.9


Average foliage score: 4.0


Light condition: Full Sun


Source: Proven Winners


Comments:


Flower and foliage scores by date:

Salvia Rockin'(TM) Golden Delicious Sage

Average flower score: N/A


Average foliage score: 4.9


Light condition: Full Sun


Source: Proven Winners


Comments:


Flower and foliage scores by date:

Scaevola Whirlwind(TM) Pink Fan Flower

Average flower score: 3.5


Average foliage score: 3.0


Light condition: Full Sun


Source: Proven Winners


Comments: 9/7 - 5 dead; Great early summer plant


Flower and foliage scores by date:

Solenostemon ColorBlaze(R) Chocolate Drop Coleus

Average flower score: N/A


Average foliage score: 4.7


Light condition: Full Sun


Source: Proven Winners


Comments: 8/24 - Splaying starting


Flower and foliage scores by date:

Solenostemon ColorBlaze(R) Golden Dreams(TM) Coleus

Average flower score: N/A


Average foliage score: 4.6


Light condition: Full Sun


Source: Proven Winners


Comments: 6/29 - 2 dead 8/10 - 2 more dead


Flower and foliage scores by date:

Solenostemon ColorBlaze(R) Rediculous (TM) Coleus

Average flower score: N/A


Average foliage score: 4.6


Light condition: Full Sun


Source: Proven Winners


Comments: 9/28 - Mottling of foliage


Flower and foliage scores by date:

Solenostemon ColorBlaze(R) Sedona Sunset(TM) Coleus

Average flower score: N/A


Average foliage score: 4.4


Light condition: Full Sun


Source: Proven Winners


Comments: 9/28 - Mottling of foliage


Flower and foliage scores by date:

Solenostemon ColorBlaze(R) Strawberry Drop Coleus

Average flower score: N/A


Average foliage score: 4.7


Light condition: Full Sun


Source: Proven Winners


Comments:


Flower and foliage scores by date:

Solenostemon ColorBlaze(R) Torchlight(TM) Coleus

Average flower score: N/A


Average foliage score: 4.9


Light condition: Full Sun


Source: Proven Winners


Comments: 9/28 - Splaying


Flower and foliage scores by date:

Solenostemon ColorBlaze(R) Royale Cherry Brandy(TM) Coleus

Average flower score: N/A


Average foliage score: 4.8


Light condition: Full Sun


Source: Proven Winners


Comments:


Flower and foliage scores by date:

Verbena Superbena(R) Raspberry Verbena

Average flower score: 2.4


Average foliage score: 2.4


Light condition: Full Sun


Source: Proven Winners


Comments: 7/27 - Severe Dieback 8/24 - Reflush of Growth


Flower and foliage scores by date:

Verbena Superbena(R) Red Verbena

Average flower score: 2.2


Average foliage score: 3.2


Light condition: Full Sun


Source: Proven Winners


Comments:


Flower and foliage scores by date:

Verbena Superbena(R) Scarlet Star Verbena

Average flower score: 2.2


Average foliage score: 2.7


Light condition: Full Sun


Source: Proven Winners


Comments: 7/27 - Dieback, struggled to reflush


Flower and foliage scores by date:

Verbena Superbena(R) Whiteout Verbena

Average flower score: 2.0


Average foliage score: 2.9


Light condition: Full Sun


Source: Proven Winners


Comments: 7/27 - Severe dieback


Flower and foliage scores by date:

Commons Names

Botanical Name


African Daisy
Osteospermum

Basil
Ocimum

Coleus
Solenostemon

Dahlia
Dahlia

English Marigold
Calendula

Fan Flower
Scaevola

Globe Amaranth
Gomphrena

Impatiens
Impatiens

Lantana
Lantana

Mexican Petunia
Ruellia

Million Bells
Calibrachoa

Ornamental Sweet Potato
Ipomoea

Petunia
Petunia

Polka Dot Plant
Hypoestes

Sage
Salvia

Summer Snapdragon
Angelonia

Spurge
Euphorbia

Verbena
Verbena

Vinca
Catharathus