Astoria Phlox: Production Secrets

'Astoria Blue' from Suntory

The Astoria series offers a wide selection of high-performing colors in annual phlox – Blue, White, Magenta, Hot Pink, Peach and Pink. In the 2011 summer field trials, ‘Astoria Peach’ was named an Outstanding Plant at Colorado State University and ‘Astoria White’ was named the best phlox at Penn State University. Astorias are ideal for patio containers, window boxes, hanging baskets, garden borders and landscapes. Plants bloom early and continuously all season long. Astorias have an upright, mounding habit, reaching a height of 14 to 24 inches with a spread
of up to 30 inches. Mix the colors for a beautiful landscape effect.

General Culture

Use a well-drained peat/perlite mix and keep pH between 6.0 and 6.5. Use a constant feed of 200-300 ppm water-soluble fertilizer. Additional micronutrients are recommended. Keep temperatures at 72-80˚F during the day and 55-65˚F at night. Provide high to moderate light levels.

Plant Growth Regulators

A combination of Cycocel and B9 drench works well, using 2,000 ppm B9 and 1,000-1,500 ppm Cycocel.

Crop Timing

• 4-inch pots – four to six weeks with one liner and one or two pinches
• 6-inch pots – seven to nine weeks with two liners and two to three pinches
• 10-inch baskets – 12-16 weeks with three liners and three pinches

Pests & Diseases

onitor for whiteflies, aphids and mites. A broad spectrum fungicide drench is recommended after planting.

Helpful Hints from Aaron McDonald
Botany Lane Greenhouse, Lafayette, Colorado

The Astoria phlox are uniform across the six colors in the series, which is what Suntory strives for in all of its new breeding. The key to being successful with Astoria is growing them drier and cooler. It is also important to provide good air movement to help them dry out. You can grow them next to other crops, but need to remember to not treat them like a Surfinia or Million Bells. The hardest thing is telling the person who is watering not to water, because the phlox need drier conditions. Once established, the plants can take more water. It’s the first four or five weeks that it is essential to keep them drier, from liner stage to transplanting into a 4-inch pot. You have to really watch what you’re doing because they have a finer root system.

Later, the plants can take the summer heat all season. The Astorias were among the top performers at the Colorado State University trials even with the heat and rain we had. The Astorias are great in larger containers – 10-inch planters and 12-inch baskets. Putting five plants into 15-inch containers makes a nice, big show. I wouldn’t go directly from a liner to anything larger than a 4-inch pot. Too much soil will make it hard to establish.

Leave a Reply

More From Varieties...
Miscanthus-Bandwidth EmeraldCoastGrowers

May 11, 2018

New Sterile Ornamental Grasses One Solution to Grass Invasion

Aggressive grass species can turn gardeners off to using ornamental grasses. Less fertile alternatives offer options for keeping grasses from taking over the garden.

Read More

May 10, 2018

Beekenkamp Plants Acquires Sunny Osteospermum Breeding Program

Beekenkamp took over all Sunny Holland sales activities in 2017, and now has ownership of the company’s entire breeding program.

Read More
Stokesia-Divinity-1-feature

May 6, 2018

Growing Tips From an Expert for Stokesia ‘Divinity’

'Divinity’ has large, white flowers that open with a hint of yellow in the center and then mature to a pure, long-lasting white.

Read More
Latest Stories
Miscanthus-Bandwidth EmeraldCoastGrowers

May 11, 2018

New Sterile Ornamental Grasses One Solution to Grass In…

Aggressive grass species can turn gardeners off to using ornamental grasses. Less fertile alternatives offer options for keeping grasses from taking over the garden.

Read More

May 10, 2018

Beekenkamp Plants Acquires Sunny Osteospermum Breeding …

Beekenkamp took over all Sunny Holland sales activities in 2017, and now has ownership of the company’s entire breeding program.

Read More
Stokesia-Divinity-1-feature

May 6, 2018

Growing Tips From an Expert for Stokesia ‘Divinit…

'Divinity’ has large, white flowers that open with a hint of yellow in the center and then mature to a pure, long-lasting white.

Read More
Panicum-Northwind-feature

May 4, 2018

Allan Armitage: Three Ways to Market Grasses as Great O…

I don’t expect my friends to know the difference between switchgrass and grama grass, yet I always try to do my best to enhance the visibility of these grasses.

Read More
Bailey-Nurseries-Tree-Art-at-US-Capitol

May 1, 2018

Bailey Nurseries Fills U.S. Capitol Front Lawn With Tre…

A 150-foot tree art installation was constructed on the front lawn of the U.S. Capitol Building to promote the planting of trees in an effort to combat climate, change while creating meaningful experiences that bring nature into people’s every day lives.

Read More
Carex-and-Onoclea

April 28, 2018

Kelly Norris: Why the Plant Experience Really Matters W…

For Millennials and other new gardeners, the features of plants such as natives aren’t terribly important. It's the benefits that are paramount.

Read More
Zinfin-Doll-Hydrangea

April 25, 2018

March Was a Month of Awards for Spring Meadow Nursery, …

After taking home a best new variety award at a Belgian horticulture event, Proven Winners held its always-popular Shrub Madness tournament to coincide with the annual NCAA Championship.

Read More

April 25, 2018

Armitage Scholar’s Final Thoughts on the People a…

"This trip solidified my desire to breed plants. Every time I was able to have a discussion about plant traits, genetics, and germplasm, I felt a thrill of excitement."

Read More
Gomphrena Truffula Pink (Proven Winners)

April 24, 2018

Armitage Talks Favorites From Danziger and Proven Winne…

From annuals that look like they came out of a Dr. Seuss book to breeding marvels in perennials and shrubs, the visits to Danziger and Proven Winners at California Spring Trials were exciting, to be sure. Here are some of Dr. A's favorites.

Read More

April 24, 2018

Proven Winners Reveals Marketing Efforts for 2018-2019 …

For the first time, the brand has generated one billion consumer impressions, and plans to keep that momentum going with a number of ambitious programs.

Read More

April 24, 2018

California Spring Trials 2018: New Plant Intros from Pr…

Check out the newest 2018 plant introductions from Proven Winners and Danziger.

Read More

April 20, 2018

California Dreaming Takes on a Whole New Meaning at CAS…

At California Spring Trials 2018, the Greenhouse Grower team witnessed the revitalization of a company, plus some awesome merchandising displays, and efforts toward automation.

Read More

April 19, 2018

California Spring Trials 2018: New Intros from Syngenta…

Check out the newest 2018 plant introductions from Syngenta Flowers, Hishtil, Jaldety, Cohen Propagators, Nir Nursery, Bailey Nurseries, and Sunset Western/Southern Living Plants.

Read More

April 19, 2018

CAST 2018: Dr. A’s Favorites From Syngenta Flowers, Bai…

From an exciting perennial to a new white begonia, Allan Armitage says these showstoppers deserve recognition.

Read More
GG-and-Benary-Team

April 19, 2018

Spring Trials Rookie Inspired by Connections

The Allan Armitage Scholarship recipient has added a number of industry connections during his time at California Spring Trials, and discusses what that means to him and his career.

Read More
Benary 2018

April 18, 2018

At CAST 2018, Sakata Captures Consumer Attention Spans,…

More than halfway through the California Spring Trials, the Greenhouse Grower team had a busy but fantastic day seeing dozens of our friends at American Takii and Benary, and spending time talking about the industry's past and its bright future.

Read More

April 18, 2018

California Spring Trials 2018: New Varieties to Watch F…

Check out the newest 2018 plant introductions from American Takii, Hilverdakooijj, Hem Genetics, Thompson & Morgan, Sakata Ornamentals, and Ernst Benary of America.

Read More

April 18, 2018

How the Horticulture Industry’s Past Shaped Its P…

Andrew Scheldorf, the winner of Dr. Allan Armitage’s California Spring Trials Scholarship, says the stories of plant origins help ground our industry to the people and places that have changed us.

Read More