TECH ON DEMAND brought to you by GrowerTalks

Preemergence Weed Control for Greenhouses & Nurseries with Janna and Steve from Envu

This episode includes critical information for both nursery and greenhouse producers! You may or may not know exactly how much time, labor and ultimately money you spend each year managing weeds in outdoor and indoor production, but chances are it’s a lot. If you don’t have protocols and strategies in place for weed control, that can lead to even bigger issues.

 

To discuss this topic, host Bill Calkins is joined by two guests from Envu—Dr. Janna Beckerman and Steve Larson—to talk through best management practices related to weed control and specifically the use of Marengo, a preemergence herbicide that not only controls more than 90 weeds (including broadleaf weeds, grasses and sedge) but also clocks in with residual activity for up to 8 months. It’s labeled for use inside greenhouses and can be a key player in your greenhouse sanitation lineup.

 

Envu’s Janna and Steve have decades of experience in our industry and bring a lot to the table when it comes to the science behind greenhouse and nursery production, as well as the real-world application of products and strategies. When it comes to weed control in production settings, Janna said it best—the greatest cost is the cost of neglect.

 

In this episode, the conversation starts with an overview of Envu’s history and innovative product range before quickly moving into weed control in nursery and greenhouse production. From regionality and seasonality of weeds and their impact to application strategies for preemergence herbicides and keys to safe use, there’s a lot to discuss. And with its residual staying power, wide range of weeds controlled and labeled indoor applications, Marengo (granular and liquid) is a product with benefits for just about every type of greenhouse and nursery operation.

 

You’ll want to listen all the way to the end of this episode to hear all the tips, tricks, research and anecdotal success stories the Envu team had to share!

 

Resources:

 

Envu’s Ornamentals Segment Website: https://www.envu.com/segments/ornamentals

 

Envu’s Products for the US Market: https://www.us.envu.com/ornamentals

 

Envu’s Products for the Canadian Market: https://www.ca.envu.com/greenhouse-and-nursery

 

Marengo Herbicide: https://www.us.envu.com/ornamentals/po/products/marengo

 

VIDEO (English)— Marengo Application/Calibration: https://youtu.be/7ZbCBCfHnb8

 

VIDEO (Spanish)—Marengo Application/Calibration: https://youtu.be/DhiSEXDGAPk

 

Envu Brochure—Nursery Weed Control: https://bynder.envu.com/m/5a01a4fcb5ddb3e7/original/Digital_TO_Nursey-Weed-Management_product-guide_NA_US_EN.pdf

 

Safely Managing Whitefly (and more) on Poinsettias with Broch Martindale

Corteva’s technical guru, flower grower and greenhouse and nursery “coach” Broch Martindale is back on the podcast to share strategies for controlling and preventing some of the more common pest and disease challenges you might face in poinsettia production—like whiteflies and powdery mildew—using chemistries like XXpire, Floxcor and Eagle.

Over the course of this episode, Broch and host Bill Calkins discuss safely using chemistries in rotation and what chemistries are appropriate for poinsettias late in production (when bracts are in color), as well as specific active ingredients that have been successfully trialed and tested to tackle common but challenging greenhouse pests. Throughout the podcast, Broch offers tips and tricks he’s turned to over the years producing crops and working with growers to manage and prevent pests when producing everyone’s favorite holiday crop.

Be sure to read Broch’s article KEEPING POINSETTIAS MERRY AND BRIGHT in the May 2025 issue of GrowerTalks magazine for even more on this topic.

 

WATCH THE VIDEO VERSION!

 

RESOURCES:

Floxcor fungicide offers ornamental growers fast uptake and broad-spectrum disease control, and is rainfast in just 15 minutes.

Floxcor Fungicide Ornamental Fact Sheet

Prevent and control virtually every major soil and foliar disease with the winning combination of Floxcor fungicide and Eagle 20EW specialty fungicide.

Floxcor + Eagle Fungicide Ornamental Fact Sheet

The two active ingredients in XXpire combine to control more than 39 insects, including 7 of the top 10 chewing or sap-feeding pests.

XXpire Insecticide Fact Sheet

Learn how XXpire insecticide can help poinsettia growers control damaging insects, without residue or phytotoxicity.

XXpire Insecticide for Poinsettias Fact Sheet

More information on XXpire insecticide

A Biological Approach to Fall IPM ft. Koppert’s Phil Gerry

This Tech On Demand podcast episode is all about fall control, integrated pest management and implementing biocontrol strategies that work. Host Bill Calkins is joined by Phil Gerry, a Technical Sales Consultant for the Northeast Region covering six states for Koppert. Koppert is a global market leader specializing in biological crop protection and team members have joined the podcast before covering biological IPM for spring crops and strategies for hybrid and truly integrated strategies. Phil was lead grower for large nurseries and greenhouses in the Northeast and Northwest before joining Koppert in 2021 and brings an incredible amount of practical knowledge and creative strategies to the topic of managing key pests in garden mum and poinsettia production.

 

In this episode Bill and Phil discuss the spring production season before jumping into the main topic—IPM for crops produced in summer for fall and holiday sales. Phil explains the importance of understanding the compatibility of biological controls and traditional chemistries, as well as why it’s critical to define what success looks like for your greenhouse or nursery before integrating biocontrols. As he reiterated, when making a move to bio-based approaches, it’s best to start slowly—choose one crop or one pest and hone skills before moving on to a more comprehensive plan.

 

When it comes to biological controls for garden mums, indoor versus outdoor production must be considered and beginning applications in propagation is the best approach for various reasons Phill addressed. Key pests discussed include aphids, thrips, fungus gnats, whiteflies and spider mites. Moving on to poinsettias, of course the main pests (whiteflies and spider mites) require diligence, scouting and early preventative controls and Phil explained some of his go-to tactics. Be sure to listen all the way to the end of this discussion because these notes barely scratch the surface!

 

RESOURCES & PRODUCTS MENTIONED IN THE EPISODE:

 

Koppert U.S.: https://bit.ly/4kR5r13

Koppert Consultants & Locations: https://bit.ly/455PYpp

Side Effects Guide: https://bit.ly/4kOoZmP

Isarid: https://bit.ly/4mASHxc

Spidex: https://bit.ly/4dHyf9S

Enermix: https://bit.ly/3SAoy3p

Swirski-Mite: https://bit.ly/3HEZOEI

Airobreez: https://bit.ly/3SAp815

 

2025 GrowerTalks Biosolutions Guide: https://www.growertalks.com/pdf/BioSolutions_Guide_2025.pdf

Dynamic Combos for All Seasons with Syngenta’s Lauren Kilpatrick

Syngenta Flowers’ Lauren Kilpatrick joins Tech On Demand host Bill Calkins to talk combos—specifically Kwik Kombos multi-liners and the new Patio Playbook program. Lauren explains just about everything you need to know to select the combination that will work in your greenhouse and deliver results for your retail customers, as well as tips and tricks for producing them at the highest quality.

Lauren and Bill kick off the discussion with a quick chat about California Spring Trials 2025—specifically Syngenta’s “Rooted In Teamwork” theme—and some of their favorites from the trial in Gilroy, CA.

Kwik Kombos is not a new program from Syngenta but they add new mixes every year and have their rigorous trialing dialed in so you can be assured that the mixes will work in production and perform beautifully at retail. Lauren explains the benefits of this early-, mid- and late-season spring program.

Patio Playbook is new (just released at 2025 California Spring Trials) and offers inspirational recipes for ALL seasons—using a wide range of inputs from foliage varieties including coleus to heat-loving annuals, perennials, tons of Syngenta’s geraniums and even garden mums. Recipes allow growers to deliver color-blocked combos to retail throughout the year, extending seasons and helping bring shoppers in to fill their carts with high-value impulse combos. It’s a win-win for everyone!

Of course, Lauren shares plenty of tips and tricks for combo culture, as well as some of her favorite mixes in both programs. Be sure to stay tuned all the way to the end of the conversation so you don’t miss any words of horticultural wisdom!

Watch the video version! https://youtu.be/3zRssbYo3kM

 

Resources:

Syngenta Flowers Website: https://www.syngentaflowers-us.com/

Kwik Kombos Catalog: https://online.flippingbook.com/view/636494595/92/

Kwik Kombos Culture Guide: https://www.syngentaflowers-us.com/sites/g/files/kgtney846/files/media/document/2025/02/26/culture_vegetative_kwik_kombos.pdf

Patio Playbook Guide: https://online.flippingbook.com/view/208275210/

Audio Files: Poinsettia Production—When Negatives Can Be a Positive

POINSETTIA PRODUCTION: WHEN NEGATIVES CAN BE A POSITIVE

FROM THE MAY 2025 ISSUE OF GROWERTALKS MAGAZINE

WRITTEN BY JAMES DOUKAS

NARRATED BY BILL CALKINS

 

EXCERPT: A mastery, or at least a proficiency, in many growth strategies allow for a grower to select the correct “tool” from their “toolbox” no matter the situation that arises in the fall to achieve their desired goal for their poinsettia crop.

Read the Digital Edition: https://www.ballpublishing.com/magazine/gt_25_05/index.aspx

Audio Files: How Much Does a Greenhouse REALLY Cost?

HOW MUCH DOES A GREENHOUSE PROJECT REALLY COST?

FROM THE APRIL 2025 ISSUE OF GROWERTALKS MAGAZINE

WRITTEN BY CHRIS BEYTES

NARRATED BY BILL CALKINS

 

EXCERPT: Anyone who’s completed a greenhouse project knows that a lot more goes into it than you might think. But how much, exactly, as a percentage of the total cost?

We asked three experts—Paul Golden with Prospiant, Matt Stuppy with Stuppy Greenhouses and Jeff Warschauer with Rovero North America—to help us with the math. It was a challenge because every site and every project is unique, and their usual answer is, “It depends,” but we forced them to break it down into key components and what percent of the project each might be. The figures below are minimums you’ll need for each category; in some cases (like site work), it could be much higher.

 

Read the Digital Edition: https://www.ballpublishing.com/magazine/gt_25_04/index.aspx

Forcing Your Perennials to Wake Up ft. Chris Fifo

Forcing perennials out of winter dormancy and into bloom for spring and summer sales isn’t a new concept for most growers, but growth in the perennial market has inspired a lot of folks to add perennials to their mix and there’s been plenty of research done to update protocols for breaking dormancy. Because of this, Tech On Demand host Bill Calkins wanted to have a quick discussion with perennial plant guru Chris Fifo (from Darwin Perennials) to make sure everyone is on the same page when it comes to waking perennials up this spring.

 

In this concise tech tip-style conversation Bill and Chris discuss the “traditional method” of forcing perennials and the “new-school way,” which results in better uniformity and reduced losses. Then Chris explains tactics any grower can use to force long-day perennials using an extension cord and a string of lightbulbs, as well as offering suggestions for reducing the risk of disease when perennials are being forced to wake up in early spring. The bottom line: It’s not as difficult as it sounds—warming them up and basic night interruption will work wonders on your perennial crop this spring.

 

WATCH THE VIDEO: https://youtu.be/rsq3hRTX0l0

 

Resources:

GROWERTALKS WEBINAR: 3 1/2 Steps to Overwintering Perennials

 
MICHIGAN STATE GUIDE: Long-Day Perennials

All About Princettia with Suntory Flowers’ Lorentina McKoy

For this installment, Lorentina McKoy, the North American sales and product rep for Suntory Flowers, joins host Bill Calkins to talk about Princettia—the unique poinsettia assortment from Suntory that looks different than traditional holiday poinsettias because it’s bred to be different. This opens up some unique uses and retail specs and also requires some production nuances. Because breeding on Princettia is quite active, a whole new range of colors and patterns has come to market in the past couple years, as well as a new sub-series with a more vigorous habit. In this episode, Lorentina offers tips and trick to produce Princettias to their full potential, some ways she’s seen them marketed and sold around the world, why the fact they’re a true “family” of genetics is important and much more.

Although this episode is focused on one crop, Lorentina and Bill actually get into many different topics—from an early-Spring outlook and consumer trends to retail garden center tips and strategies to sell premium products. You’ll want to listen all the way to the end because this episode closes with some other top picks in the Suntory range of new varieties for 2026.

 

RESOURCES:

12-page Princettia Brochure—with culture notes: suntoryflowers.com/wp-content/uploads/2023/12/Princettia-Brochure-2023-digital-1.pdf

The 2026 Suntory Flowers Catalog - Suntory Flowers

Princettia Section—direct link: https://online.flippingbook.com/view/232823221/40/

“Just for Retailers” Page: Princettia Poinsettia - Suntory Flowers

Princettia Consumer Information: New Ways to Display Princettia Poinsettias this Holiday Season - Suntory Flowers

Broad Mites (and Lewis Mites) with Dr. Raymond Cloyd

One of the greenhouse pests growers have been dealing with more and more recently is broad mite. This specific mite pest is extremely challenging to diagnose and treat and can wreak havoc on a very wide range of crops across multiple seasons. Host Bill Calkins is joined by well-respected professor and extension specialist in horticultural entomology at Kansas State University, Dr. Raymond Cloyd, to discuss this pest—from susceptible crops and theories why broad mites are on the rise to symptoms and identification. Dr. Cloyd then shared a bit about the pest itself and strategies to minimize the risk of losing crops due to broad mites and methods for control.

Once broad mites were covered, Bill asked Dr. Cloyd about Lewis mites (based on challenges with this pest on poinsettia crops in 2024), and the episode closed with the importance of sanitation, diligent scouting and IPM protocols during spring production. You’ll want to listen all the way to the end of this episode and share it with your entire production staff.

 

RESOURCES:

Broad Mite and Cyclamen Mite Management in Greenhouses and Nurseries:  https://bookstore.ksre.ksu.edu/pubs/MF2938.pdf

Dr. Raymond Cloyd Contact Information: https://entomology.k-state.edu/about/people/faculty/Cloyd-Raymond-A.html

Extension & Research Program (Publications, Articles, Reports, Etc.): https://entomology.k-state.edu/about/people/extension/Cloyd-Ext-Research/ 

 

A bit about Dr. Raymond Cloyd: Raymond has an extension (70%) and research (30%) appointment in the Department of Entomology at Kansas State University (Manhattan, KS). Raymond received his MS and PhD from the Department of Entomology at Purdue University (West Lafayette, IN), and was employed as a professor at the University of Illinois (Urbana, IL) in the Department of Natural Resources and Environmental Sciences for six years prior to his employment at Kansas State University. His research and extension program involves plant protection/pest management in greenhouses, nurseries, landscapes, turfgrass, conservatories, interiorscapes, Christmas trees, vegetables, fruits, cannabis, hemp and pollinators. Raymond is the extension specialist in horticultural entomology for the state of Kansas with a major clientele that includes homeowners, master gardeners, and professional and commercial operators. Raymond has published over 100 scientific refereed publications, over 900 trade journals, and over 60 extension publications on topics related to pest management/plant protection. In addition, he has authored or co-authored numerous books including Greenhouse Pest Management, Pests and Diseases of Herbaceous Perennials, IPM for Gardeners, Plant Protection: Managing Greenhouse Insect and Mite Pests, Compendium of Rose Diseases and Pests, Compendium of Bedding Plant Diseases and Pests, and Western Flower Thrips: Insect Pest of Greenhouse Production Systems. Raymond has also written book chapters, manuals, PICT or picture-pocket guides, and extension-related publications. Raymond is a frequent speaker at state, national, and international conferences and seminars; and has received numerous awards and honors during his over 25-year academic career. Raymond’s professional specialty areas are plant protection, biological control, plant-insect interactions, insect ecology, pesticides, integrating pesticides with biological control agents and sanitation.

2025 California Spring Trials Debrief ft. Chris Beytes & Jen Zurko

Host Bill Calkins welcomed GrowerTalks’ editor in chief Chris Beytes and editor Jennifer Zurko to the podcast to share thoughts on the event—the plants, the trends, the fish tacos—and the overall impact spring trials has on the professional horticulture industry.

When Chris, Jen and Bill return from Spring Trials each year, folks in the industry always ask for overall thoughts, hot new varieties expected to be big sellers and what they consider to be industry breakthroughs. It was Bill’s bright idea to record a podcast answering some of these questions and of course, his partners in crime for the annual trek westward agreed to it.

Here are the questions the three tackled in this episode:

• If the 2025 California Spring Trials were a person, how would you describe their 2025 vibe?
• Name a few new introductions from CAST 2025 that stand out in your mind—and why.
• Do you go to CAST looking for something specific or just to see what’s new and report back via the magazine, videos and social media?
• If you could have ONE new introduction shipped to your house for free, what would it be?
• What are some new intros that you feel are Instagram-ready?
• What new variety should launch on Shark Tank?
• Name some 2025 CAST varieties that got major promotion at the event that you think will live up to the hype?
• Were there any new intros that made you think, “what the heck is that” OR that surprised you?
• What’s a new product you haven’t seen yet that you WISH would be introduced (i.e. if you were launching your own product, what would it be?)
• What’s ONE reason why a grower who’s never been to Spring Trials should go at least once?

 

CHECK OUT BALL PUBLISHING’S INDUSTRY-LEADING COVERAGE OF THE 2025 CALIFORNIA SPRING TRIALS:

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