Overwintering Perennials: Plan Ahead To Fungicide Drench And Cover

Perennials in hoop houseCommercial horticulture has seen a tremendous amount of change in the past decade, and the perennial market has not been left behind. Demand for perennials has increased as consumers educate themselves and seek out new and improved varieties.

Overwintering perennials can become an important profit center. Fall planting makes better use of available labor for many growers.

When To Transplant Perennials For Overwintering

Perennial transplanting time depends on labor, greenhouse space and the availability of plant material. Transplanting perennials from 50 or 70 cells can be done in August. In the North, smaller plugs should be planted as early as July. Depending on your area, finish planting no later than early to mid- October to allow the plants time to establish good root systems. The further north that your operation is located, the earlier this needs to be accomplished. Growers in southern climates have a larger window in which to get their perennials planted and bulked up for winter.

Protect Perennials Against Disease

The onset of cold weather causes top growth to die back. Cleaning up and pruning is important at this time to prevent diseases such as botrytis from occurring. A preventative, broad-spectrum fungicide drench can be applied at this time to lend extra protection for the roots. Banrot and Hurricane are broad-spectrum fungicides that contain two active ingredients. Tank mixes can also be used. Combine Terrazole L, Segway or Subdue Maxx with Affirm, Cleary’s 3336 or Medallion to protect against the major root and crown diseases.

Think About Indoor Climate

Perennials can be overwintered in an unheated house with a poly film cover or covered outside by December with an overwinter protection blanket. Avoiding heat build-up on sunny winter days is important. Greenhouses with roll-up sides are ideal to maintain cool temperatures if outside temperatures rise above freezing during the winter months. White poly and/or positive ventilation can also be used to keep day temps cool.

Inside production should begin by heating the greenhouse to 50°F, if needed, until all of the perennials are established. Slowly lower the temperature to 35°F and maintain that temperature throughout the winter. Keep the perennials cool even when they start growing in the spring. This is to avoid unwanted stretch and premature blooming that would cause lost sales opportunities.

Outdoor Production Is Subject To The Natural Elements

Once cold weather arrives, cover perennials with an overwintering protection fabric or place them in a hoop house covered with white plastic. Rodent baits are imperative no matter which method you choose. Once the outside temperatures begin to rise and new growth appears, ventilate the hoop house or uncover the beds to promote air circulation so that new growth doesn’t stretch or become soft.

Leave a Reply

More From Plant Culture...
Bob_Peters

July 28, 2015

J.R. Peters’ Founder Dies At 97

J.R. Peters announced that its founder, Robert (Bob) Peters has died. Here is how his family and coworkers honored him: It is with great sadness that we announce the passing of Robert (Bob) Peters, 97 years old, founder of the Robert B Peters Company. Our mentor, father and grandfather passed away peacefully surrounded by his family on July 18 in Allentown, Pa. He was a true floriculture chemist who designed and formulated the earliest Peters Fertilizer Products that still carry his name today. Born October 12, 1917 in Hanover, Pennsylvania, he was the oldest of 6 brothers. He made his home in Allentown where he started his first business, Peters Horticultural Services, in his mother’s garage in 1947. Bob was happily married for over 50 years and has 4 children, 13 grandchildren and 7 great grandchildren. His passion for plant nutrition began in 1947 after he completed his service in […]

Read More
2016 SHSG covers.indd

July 28, 2015

SHS Griffin Releases 2016 Catalog In Print And Expanded Digital Formats

SHS Griffin has announced the release of its annual seed and plant catalog for the 2015-16 season. Available in both print and digital formats, the 2016 catalog features more than 400 new and improved varieties from the industry’s leading breeders. The 262-page print catalog covers the company’s full seed portfolio — more than 3,400 cultivars of annuals, perennials, ornamental grasses, herbs and vegetables. From the SHS Griffin vegetative offering, the complete spring-annual assortment from Syngenta Flowers is featured, alongside new introductions and top sellers from nine top suppliers such as Proven Winners, Dümmen Orange and Suntory. More than 120 vegetative perennials from Syngenta Flowers are also included, including several SHS Griffin exclusives. The SHS Griffin 2016 digital catalog includes all of the product information and photography from the print edition, and more. For the first time, SHS Griffin has added a range of digital-only bonus content: detailed crop culture, quick […]

Read More
Cal-Poly fields

July 28, 2015

Cal-Poly To Preserve Campus Agricultural Land

California Polytechnic State University, San Luis Obispo will no longer consider development of nearly 43 acres of prime agricultural land just west of its campus core, as the university proceeds with the two-year process of updating its campus master plan. In May, the university had released an update to its Master Plan that indicated that almost all of its orchards, horticulture facilities and field sites may be repurposed for future development of university housing and other campus infrastructure. Most of the land in question is classified Class 1 farmland. The acreage is used now for lemons, grapevines, mandarin oranges, a deciduous orchard and silage for the university’s livestock. The proposed changes would have directly affected the current orchard plantings and other long term plans for the department, according to a letter from Scott Steinmaus, the horticulture and crop science department head. Steinmaus encouraged industry members to submit their comments to the university. An […]

Read More
Latest Stories
cannabis, marijuana plant

June 27, 2015

Concern Grows Over Unregulated Pesticide Use On Cannabi…

As most growers know well, the federal government regulates all insecticides, fungicides, herbicides and other commercial chemicals used on agricultural crops. Therein lies the problem with use of chemicals on cannabis crops – so far, the feds want nothing to do with legalized marijuana. According to “Concern Grows Over Unregulated Pesticide Use On Cannabis,” a June 17 article on the National Public Radio (NPR) network by Agribusiness Reporter Luke Runyon, the lack of regulated chemicals for cannabis has left growers to experiment on their own. “In the absence of any direction the subject of pesticide use on the crop has just devolved to whatever people think is working or they think is appropriate,” said Colorado State University Entomologist Whitney Cranshaw in the NPR report. “Sometimes they’ve used some things that are appropriate, sometimes unsafe.” Denver officials held tens of thousands of marijuana plants earlier this year due to safety concerns, but […]

Read More
Great-spangledFritillary

June 16, 2015

The Butterfly Effect: Insect’s Wings Key To Azalea Poll…

A researcher from North Carolina State University (NC State) has found that in the case of the flame azalea (Rhododendron calendulaceum), all pollinators are not created equal. In fact, due to the flower’s unique reproductive structure, butterflies — and specifically, their wings — are the key to pollination. The flame azalea is commonly found in the Appalachian Mountains, ranging from as far north as New York to Georgia in the south. Like most azaleas, the flowers are large, and have an unusual structure: both the anther (male) and stigma (female) parts are very elongated and separated from one another. NC State biologist Mary Jane Epps was interested in how the azalea’s flower structure affected its pollination. “In order for a plant to reproduce, a pollinator — usually an insect — has to spread the pollen from the anther to the stigma,” Epps says. “In the case of the flame azalea, […]

Read More
Bee on a Sedum

March 17, 2015

4 Key Pollinator Research Projects To Be Funded By Hort…

The Horticultural Research Institute will grant $125,000 in financial support for four key projects as part of the Horticultural Industry Bee & Pollinator Stewardship Initiative. The Initiative has three primary goals. First, to convene a task force to develop a bee and pollinator stewardship program, including creation of best management practices for plant production. Second, to identify and fund research that will help answer key science questions and fill gaps needed to design and refine the stewardship program. Third, to seek to positively position the horticultural community and its customers by collaborating with other compatible groups interested in augmenting pollinator habitat and protection.

Read More

March 11, 2015

Pollinator Initiative Promotes Bee-Friendly Talking Poi…

AmericanHort and the Society of American Florists are working tirelessly with the ornamental industry's Pollinator Stewardship Initiative on a number of new projects.

Read More

February 11, 2015

Infusion Technology Boosts Seed Performance, Study Sugg…

Seven-year-old wheat seed germination can increase by as much as 83 percent, according to a Vital Force Technology Study that looks at the effects of energy infusion technology on plant vitality.

Read More

February 3, 2015

American Floral Endowment Accepting Research Pre-Propos…

If you are pursuing a floriculture research project, now is the time to apply for funding through the American Floral Endowment. Research pre-proposal applications for 2015-2016 funding are due to AFE by June 1, 2015.

Read More

January 27, 2015

Marijuana’s Trajectory And Ascent To Horticultural Cr…

Marijuana growing is poised for change as growers and researchers focus on improving production practices.

Read More

December 9, 2014

Greenhouse Production: Two Years Of Basics & Beyond…

Greenhouse Grower's Basics & Beyond articles cover some of the latest news and research going on in greenhouse production. Here are article links for the last two years.

Read More
GrowIt! App Wins Gold At Design100 2014 US Mobile & App Design Awards

November 24, 2014

GrowIt! App Wins Gold At Design100 2014 US Mobile &…

The social garden app GrowIt! takes the Gold Winner award at the design100 2014 Mobile & App Design Awards.

Read More

November 10, 2014

The Perennial Farm Joins HGTV HOME Plant Collection

The Perennial Farm joins the HGTV HOME Plant Collection growers' network for 2015.

Read More
AmericanHort

November 4, 2014

AmericanHort Publishes Revised American Standard For Nu…

AmericanHort announces the revised American Standard for Nursery Stock (ANSI Z60.1) is now available for industry use. The Standard reflects the consensus of the industry regarding how nursery stock — living plants other than annuals — should be specified and sold within the trade.

Read More

September 26, 2014

Master The Art Of Watering

Watering is elemental to healthy plants, but one of the hardest concepts for new employees to master in the greenhouse. Recommend these tips to start them off right.

Read More

September 16, 2014

Ball FloraPlant’s Las Limas Facility Provides Gro…

Ball FloraPlant’s Las Limas farm in Esteli, Nicaragua, is one year away from full production, but sales and quality from the two-year-old facility are right on track.

Read More
Erysimum 'Cheers' from Darwin Perennials

September 15, 2014

Darwin Perennials Takes Production Offshore In Bogota, …

With its recent purchase of a farm in Colombia, Darwin Perennials is ready to amp up supply of its perennial genetics, to provide growers with tried-and-true varieties and comprehensive production specifications.

Read More

July 23, 2014

Plan Now To Prevent Bract Edge Burn On Poinsettias

Reduce fertilizer and water, and allow your poinsettias to develop slowly during the final four weeks of production to avoid bract edge burn.

Read More

July 11, 2014

Growing Your Crops Above Their Base Temperature

Lowering temperature set points in the greenhouse may help you combat rising heating costs.

Read More

May 1, 2014

Growers Report Nutritional Problems On Geraniums

In recent weeks, several growers have contacted Michigan State University Specialists about leaf discoloration on geraniums, especially the purpling of lower leaves.

Read More

April 22, 2014

How Two Postharvest Care Products Worked On Potted Plan…

What your potted plants look like at retail translates to sales or fails. North Carolina State University researchers report on how two postharvest care products performed.

Read More