Environment Canada has placed most of Southern Ontario under a Heat Alert for the next few days. It’s the time of year for sticking poinsettia cuttings, and cuttings of any floral crop are susceptible to extreme temperatures. Plants are just like people, crank up the heat and they put all their energy into just surviving the conditions, not forcing roots. Stressful conditions at rooting can lead to poor plant quality and cause defects that will be seen later in production like poor branching and leaf deformities. Continue reading “Keep those cuttings cool!”
Happy spring! With the season in full swing, we know that growers are busy this month. I read an interesting article on the effects of supplemental LED lighting in bedding plants this week, and I’ve summarized it here with the key messages at the bottom of this post. It seems like an appropriate article for the season, especially if you are starting to think ahead to how you might improve production for the 2017 spring season.
Much of the LED lighting research done in ornamental plants has focused on finding the best wavelengths for plant production. This can vary based on the plant being grown, and the qualities desired. Before we dive into the study, let’s review some of the reasons why you might consider LED lights from a plant production standpoint. Continue reading “Supplemental Lighting Options for Bedding Plant Seedling Production”
I’ve had a handful of calls in the past few weeks asking me to identify poor air quality damage on spring bedding crops. Even if you have never had problems, the following is a good refresher on why proper maintenance of greenhouse heating systems is important.
Natural gas and propane are popular choices when it comes to heating a greenhouse. The products of burning fuel are carbon dioxide (CO2) and water (H20); both compounds we know are good for your plants. However, combustion is often (if not always) incomplete, and impurities such as carbon monoxide (CO), sulfur dioxide (SO2) and ethylene (C2H4) are also released leading to poor air quality if your heater is not properly vented.
These impurities can leave your crop looking a bit down (Literally! It’s called epinasty, see more below), and it can happen in as little as 24 hours. Continue reading “A Burning Question: Ethylene and Sulfur Dioxide Damage in the Greenhouse”
The ice storm that passed through Ontario late last week may have disrupted more than just your travel plans. If your power went out, and your generator didn’t kick on right away your greenhouse might have dipped in temperature overnight, leading to possible cold or chilling injury. Continue reading “Recognizing Cold Injury”