Author Archives: Sean Westerveld

About Sean Westerveld

Ginseng and Medicinal Herbs Specialist, OMAFRA

Collecting Accurate Weather Data for Ginseng Production

Weather monitoring is important for understanding crop conditions, determining the timing of pesticide application, and deciding whether previous pesticide applications were effective. However, it is important to understand how weather conditions should be monitored so the information is accurate and … Continue reading

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Ginseng Crop Update – Dealing with Frost Damage May 22, 2020

The damage from last week’s freeze events has become more evident over the past few days. In past frost events, typically the stem is the most affected by frost, either resulting in kinking or splitting. This can weaken the top … Continue reading

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Lavender Crop Update – Winter Damage Assessment – May 14, 2020

Hopefully winter is finally over. Thankfully the cold weather in April and early May kept plants from getting too advanced and likely prevented significant damage to the lavender over the past week. The only plants that may have damage are … Continue reading

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Fertilizer Calculations for Lavender

The notion that lavender does not need or like fertilizer has been proven false. While lavender seems to survive fine without fertilizer or irrigation, it definitely performs better with both. Your plants may look perfectly fine without fertilization but you … Continue reading

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Ginseng Crop Update – Protecting Frost Damaged Plants – May 13, 2020

Varying amounts of damage from the past week’s freeze and snow events are being reported depending on the low temperatures in the area, how emerged the crop is, whether row covers were put on the crop, and how much snow … Continue reading

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What to Expect from Herbicides in Cold Weather — ONvegetables

Kristen Obeid, OMAFRA Weed Management Specialist – Horticulture I’ve been getting a lot of questions on how well certain herbicides will work in our colder than normal weather. There is no question that cold weather will impact post emergent herbicide … Continue reading

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Specialty Crop Frost/Freeze Protection Update

Weather forecasts from several different sources are in agreement with lows for tonight and again early next week reaching -3 to -4oC. Current indications suggest that the cold tonight will be accompanied by a breeze of around 10 km/hr. As … Continue reading

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