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rick7072

Freezing weather and tiny seedlings

Rick (zone 6b, MA)
8 years ago
last modified: 8 years ago

Here in the Boston area we had a mild winter and that's kept up into the early spring. Lured by the warmth, I went ahead and planted from packets of flower seed blends of mixed annuals and perennials into several areas outside. The instructions suggested planting 4-6 weeks before average last frost date (April 21-30 here), so I sowed the seed on March 12. In the last week I'm starting to get some (not a lot) germination and some tiny seedlings. Some of the flowers in the mixed seed packets:

  • Texas Bluebonnet
  • Annual Phlox
  • various Coneflower
  • Indian Blanket
  • Butterfly Flower
  • Showy Evening Primrose
  • various Coreopsis
  • Gayfeather
  • Purple Prairie Clover
  • Upland Aster
  • Black-Eyed Susan
  • Ironweed

But our weather is about to change. Over the next four days we're getting hit by a genuine Arctic blast. Pre-dawn temperatures are predicted to be 26 Monday, 22 Tuesday and 19 Wednesday.

I'm pretty sure un-germinated seeds won't be bothered by these freezing temperatures, but I have a suspicion that three seriously cold nights could damage or possibly kill anything that has poked its head up above ground. I think these are moderately frost-resistant flower varieties, but I may be stretching it if it's going down to 19.

Would appreciate any thoughts on this.

I have some good-sized frost blankets that I used last October to keep a single Morning Glory plant alive and blooming well into November. I have a feeling they'll come in handy over the next few days, but I'm not sure how much good they'll do at 19 degrees.

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