What is the lowest temperature Pansies can tolerate? hortensis.Most are F1 hybrids derived from crossing V. tricolor with V. lutea and V. altaica. Between 50 and 65 degrees is ideal, but room temperature is acceptable. The spores can be seen with the aid of a 15-20x magnifying glass, hand lens, or microscope. Aim to get winter pansies in the ground a few weeks before soil temperatures hit that 45º F mark. When temps fall below 10 degrees for several hours, this is extreme cold for Pansies and Violas. Plant out hardened-off … Temperatures that dip to 25 degrees will likely damage the flowers on pansies. Pansies are a symbol of love and affectionate thoughts (their name is thought to derive from the French word for thought). If you intend to use yours as winter houseplants, avoid damage by moving or covering them whenever temperatures are slated to fall below 29 F. They may even survive a hard freeze, which is 28 F. Both snapdragons and pansies can survive short periods of 20 F weather, but they will probably suffer frost damage. Growing 6 to 8 inches tall, pansies are ideal for container gardens or mass plantings around trees or along garden walkways. Pansies come in a wide assortment of colors and bi-colors, many with super cute face patterns on the petals. Happy gardening! Temperatures below 25 F will kill stem tissue too, so -- with the exception of a few of the more obscure species -- geraniums usually won't survive a hard freeze. 2019 Note: I posted my 2019 list of Winter Kill Temperatures of Cold-Hardy Vegetables on April 30, 2019 March 2020 Update: Click the link. The roots cannot absorb water from the frozen soil. All stages of pansies can be infected and killed. This is usually most apparent in shady beds and northern exposure settings. The black discoloration is due to fungal spores within the root. The types most often sold commercially are known as Viola × wittrockiana or by the older name, Viola tricolor var. This publication provides guidelines for the planting and care of pansies to ensure success, including planting time, bed preparation, plant spacing, planting procedures, fertilization, freeze protection, and common insect and disease problems. When soil temperatures drop below 45º F, pansy roots shut down, which means above-ground growth and flowering grinds to a halt. Here’s the long version of one of the slideshows I presented on January 13 at the Future Harvest CASA conference.Since I got home, I updated my Winter-Kill Temperatures list, which appears in the slideshow. In northern regions with cool summers, they’re planted in spring and may flower all season long, until a freeze in late fall kills the plants. temperature, mulches help prevent weeds from germinating! Plants remain alive and can rebound when soil temperatures shift. They love cool weather and will add tons of color to the winter landscape in frost-free regions. The disease can be especially destructive during late summer months when temperatures are high and when the substrate pH is higher than 6.0. After germination, keep the temperature as low as you can. In hot-summer/mild-winter climates, pansies are often planted in fall, and they’ll bloom all winter into spring, until rising temperatures cause the plants to flag. Frozen soil and drying winds can kill the … A good 2 to 4 inch layer of mulch (pinebark, pinestraw, or shredded hardwood bark) should help make for health, happy pansies. It is a good idea to monitor the weather, as temperatures that drop into the low 20s can damage even the most cold-tolerant annuals, such as pansies. Pansies prefer cool temperatures. David Goforth of the North Carolina Cooperative Extension says pansies can survive up to eight hours at 10 F. Longer periods of very cold temperatures will kill them. 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