Frost and, more specifically, alternate freezing and thawing can destroy plant cell walls, often killing tender plants, but hardier species can be affected as well. Bedding plants and tender vegetables, such as potatoes and tomatoes, show a range of symptoms in cold weather: leaf darkening or yellowing, leaf curling, scorch, tissue destruction and even plant death. Here is an example of damage to foliage of a variety of capsicum following an early morning frost in the production gardens at TAFE. Preventing frost damage involves choosing planting positions carefully to avoid 'frost pockets' (where cold air settles at the bottom of a slope), or a position in early morning sun. Other tips to prevent frost damage :
- don't apply nitrogen-rich fertilisers late in the season as they stimulate soft, sappy growth which is especially vulnerable to cold damage
- Cover plants with a double layer of horticultural fleece or in a frame when frosts are forecast.
- Grow frost sensitive plants near walls that may radiate some heat at night.
Ref: Judy McMaugh, pg. 20, Royal Horticultural Society Website
Good overall detail, well done
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