Growing Hellebores In The Greenhouse

A dazzling range of colors are available in Terra Nova’s Winter Jewels collection.

Hellebores might be the perfect perennial. What other plant has lustrous, handsome foliage and sumptuous flowers in an array of shapes and colors? What other plant tolerates dry as well as wet soils, has few pests and is deer-resistant?

These plants are the first to greet the garden center customer in early spring. The cheerful flowers are a perfect complement to spring bulbs with foliage that persists until winter and acts as a foil for annuals and perennials in the summer. Tolerant of severe winters and hot, humid summers, hellebores fill an important niche in the landscape-plant market. They can handle sun as well as shade. In other words, they rock!

Grower Tips

Planting: Plant one 30-cell liner per 6-inch or gallon pot in well-drained media. Make sure not to cover the crown by planting too deeply. This is the most common failure. The soil level of the pot and liner should match evenly.

A preventative fungicide at potting can be beneficial. A tank mix of mefenoxam and thiophanate-methyl or any other broad-spectrum fungicide will do. Be sure to read the label for desired rates and application intervals. As with any chemical, test on a small group of plants before applying to the entire crop.

 

pH/EC: Maintain a pH of 5.5 to 6.5 and an EC of 1.0 to 1.5 via the
pour-through method.

Temperature: Hellebores do well with night-time temperature of 40°F to 45°F and 60°F to 65°F during the day. Much root growth occurs during cooler periods. Plants prefer a cooler location in a greenhouse. Bench temperatures are usually 10-plus degrees higher than the ground.

Light: Provide 2,000 to 3,000 foot-candles of light. Use shade cloth between 50 percent and 70 percent depending on location during the summer.
PGRs: Configure can help to promote basal branching and can be used when bulking the plant. It can sometimes cause distorted growth on the leaf that was emerging at the time of application, but the plant will quickly grow out of it. It is generally better to use lower rates and apply more frequently as opposed to higher rates with a single application.

Fertilizer/Watering: Supply a low to medium rate of constant liquid feed at 100 to 150 ppm of 20-10-20. Allow the plants to dry slightly between irrigations, but keep plants moist throughout production.

Pests/Disease: Aphids and thrips are the main pests of hellebores. Pythium and Phytophthora can be problems if the plants stay waterlogged for prolonged amounts of time. Fungal leaf spotting can be an issue if the foliage remains wet for prolonged periods of time. Remove the previous year’s foliage either before new growth begins or as new leaves emerge. The O’Byrnes recommend a mixture of pyrethrins and canola oil sold by Gardens Alive called Pyola Oil that is very effective and is acceptable to organic growers.

Scheduling: The finish time from a 30-cell liner to a 6-inch pot is 10 to 12 weeks. It takes 16 to 18 weeks to finish from a 30-cell liner to a 1-gallon pot. Dormancy is required for flowering.

Leave a Reply

More From Varieties...
Penn State University Trial Day

August 26, 2016

How Greenhouse Growers Can Broaden Their Horizons

Allan Armitage says you can learn new ideas to help your business when you get out to visit plant trials and other growers.

Read More

August 23, 2016

Kick Spring Sales Up A Notch With 18 New Plant Introductions For 2017

It’s time to look forward to the spring season and what plants will get your business off to the right start. These 18 new cultivars have all the traits of good breeding — uniform habits, bold colors, showy blooms, good vigor, and excellent branching.

Read More

August 23, 2016

Gardens Alive! Parent Company Buys Zelenka Farms

  Zelenka Farms, which has been in Chapter 11 bankruptcy, says LM Farms, which owns Gardens Alive!, has purchased the company and all of its assets. BFN Operations LLC and its affiliated entities, d/b/a Zelenka Farms, operated one of the largest wholesale nurseries in the U.S. Its products include shrubs, trees, perennials, roses, and groundcovers. The owners of Gardens Alive! have successfully purchased several other companies from bankruptcy and are experienced nursery managers. Niles Kinerk, Chairman of LM Farms, stated that “the opportunity to purchase Zelenka Farms assets and to continue the turnaround that is well underway is exactly the kind of opportunity that we look for. We understand the efforts of the management team led by Eric Ek and others have been successful, and we will support the management team in the coming months and years.” Zelenka Farms operates its six facilities across the key growing regions in the […]

Read More
Latest Stories
Penn State University Trial Day

August 26, 2016

How Greenhouse Growers Can Broaden Their Horizons

Allan Armitage says you can learn new ideas to help your business when you get out to visit plant trials and other growers.

Read More

August 23, 2016

Kick Spring Sales Up A Notch With 18 New Plant Introduc…

It’s time to look forward to the spring season and what plants will get your business off to the right start. These 18 new cultivars have all the traits of good breeding — uniform habits, bold colors, showy blooms, good vigor, and excellent branching.

Read More

August 23, 2016

Gardens Alive! Parent Company Buys Zelenka Farms

  Zelenka Farms, which has been in Chapter 11 bankruptcy, says LM Farms, which owns Gardens Alive!, has purchased the company and all of its assets. BFN Operations LLC and its affiliated entities, d/b/a Zelenka Farms, operated one of the largest wholesale nurseries in the U.S. Its products include shrubs, trees, perennials, roses, and groundcovers. The owners of Gardens Alive! have successfully purchased several other companies from bankruptcy and are experienced nursery managers. Niles Kinerk, Chairman of LM Farms, stated that “the opportunity to purchase Zelenka Farms assets and to continue the turnaround that is well underway is exactly the kind of opportunity that we look for. We understand the efforts of the management team led by Eric Ek and others have been successful, and we will support the management team in the coming months and years.” Zelenka Farms operates its six facilities across the key growing regions in the […]

Read More
Coreopsis-UpTickCream-19793-DarwinPerennials

August 20, 2016

Growing Tips On Coreopsis UpTick Series From John Wilso…

Editor’s Note: In this new feature, the Greenhouse Grower varieties team will choose one noteworthy variety each month we think is worth bringing to your attention. Then we’ll share growers’ and breeders’ perspectives on the best ways to produce it successfully at your operation. This month we focus on the hardy Coreopsis UpTick series, winner of Greenhouse Grower’s 2016 Industry’s Choice Medal of Excellence for Breeding. Growing Tips From John Wilson, Seville Farms When asked about producing Coreopsis UpTick, John Wilson says he doesn’t have much to say because it was so easy to grow. Wilson, a Corporate Grower for Seville Farms, says based on the new series’ strong performance during the trialing he has done so far, the nursery ordered a large quantity of the plants for future growing. “If breeders were looking to come up with something that says ‘wow,’ they have done it with the UpTick Series,” […]

Read More
Eucomis arrangement from Golden State Bulb

August 19, 2016

What’s New With Blooming Potted Plants

From exotic orchids and lilies to flashy red cyclamen and jaunty gerberas, new blooming potted plants come in every shape, size, and color.

Read More
Craspedia Golf Ball Beauty (Danziger)

August 19, 2016

Learn How Unconventional Plants Can Be Hidden Gems

According to Kelly Norris, plant breeding inspired by consumer motivations and interests restores our connection with consumers thirsty for out-of-the-ordinary plants.

Read More
Petunia 'Moonstruck' (2015 Welby Gardens Field Trials)

August 9, 2016

Welby Gardens Names Top Selections From Its Trial Garde…

Welby Gardens, an exclusive grower of Hardy Boy Plants, tested more than 900 varieties this year in its field and container trials. Find out which varieties were the cream of the crop.

Read More

August 6, 2016

Growing Tips On Petunia ‘Night Sky’ From Da…

Production tips for Petunia ‘Night Sky’ from Dan Chaney, Vice President of Production, at Ivy Acres.

Read More
Janeen Wright

August 5, 2016

Deliver Plant Performance As Promised

It would be ludicrous to promise more than you can deliver. But you can deliver more than you promise to your greenhouse customers.

Read More
OSU 2016 In-Ground trials

August 2, 2016

Ohio State University 2016 Plant Trials Offer Real-Time…

The Ohio State University (OSU) displayed more than 500 cultivars for evaluation this year at the Chadwick Arboretum and Learning Gardens in Columbus, OH. Several Cultivate'16 attendees took the opportunity to wander the trial grounds and evaluate in-ground entries and those in sun and shade containers and hanging baskets.

Read More
Bellis Speedster (Benary)

August 2, 2016

How Fall Can Be About More Than Pansies

Allan Armitage suggests a few notable plants for the fall shoulder, fall sales, and spring shoulder seasons.

Read More
Petunia 'Amore Queen of Hearts' from Danziger

August 1, 2016

Danziger Targets Future Growth With Recent Management C…

The changes will provide a foundation of growth, creativity, and innovation, notes Micha Danziger, who will now serve as chairman of the Board of Directors.

Read More
Griffin 2017 Seed and Plant catalog

July 31, 2016

Griffin 2017 Plant Catalog Now Available In Print And D…

The print catalog features more than 280 new varieties, while the digital edition has several bonus resources.

Read More
Westhoff-Florist Holland combos

July 30, 2016

Pair New Spring Crops With Fresh Ideas For Increased Sa…

There are plenty of exciting, new spring crops to consider incorporating into your crop selection. What will set your operation apart is how creative you are about what plants you select, and how you promote them.

Read More
Pleasant View Gardens Savor Edibles

July 22, 2016

Pleasant View Gardens Targets Millennials With Savor Ed…

Taking something as ubiquitous as vegetables and herbs and giving it a fresh new look is no easy task, but Pleasant View Gardens took on the challenge with extensive research and creative marketing.

Read More
Dummen New Columbus Office

July 21, 2016

Dümmen Orange Opens New North American Headquarters In …

The new office, which officially opened during Cultivate’16, supports the company’s vision to be integrated into a vibrant and inspiring community, and provides a bright, modern workspace for its approximately 30 local employees.

Read More
Pollen Free Lisianthus

July 20, 2016

Sakata Seed Develops World’s First Pollen-Free Lisianth…

With no stamen to produce pollen, the new Lisianthus varieties have improved flower durability and the benefit of no scattered pollen that can cause staining of flowers and machines.

Read More

July 19, 2016

17 New Vegetable Intros For Greenhouse Production

New varieties of edibles introduced at 2016 California Spring Trials offer something for every type of gardener, from the beginning do-it-yourselfer to the hardcore, heirloom-only type. Check out some of the new varieties we saw at Spring Trials this year that will be available for retail in 2017.

Read More
[gravityform id="35" title="false" description="false"]