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The Best Vegetables & Flowers to Start with Winter Sowing

February 11, 2021

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Winter sowing vegetables and flowers is a wonderful way to start strong seedlings that don’t really need hardening off. Over the winter, you can save your milk jugs, fill them up with soil and seeds, and be rewarded with your own seed starters in the Spring. However, some seeds lend themselves to winter sowing better than others.

In this post I’ll provide a list with pictures of the best flowers and vegetables to start in your milk jugs over the winter. As well, we’ll go over the process behind winter sowing and discuss why some vegetables are better than others.

A quick disclaimer or two: I personally garden in zone 3b in Saskatoon, Saskatchewan, Canada. We have a short growing season that’s around 100 days, and a cold climate. Since our last frost date is so late–somewhere around the 3rd week in May, we can still put our milk jugs for winter sowing out in April and still see results. So even though it’s called winter sowing, for me, it’s a bit of a misnomer, as I’m “sowing” seeds in spring because it’s still so cold.

Winter Sowing is Not the Same As Seed Starting Indoors

I confess, the reason I’m even writing this post is because I’ve gotten a lot of messages from readers asking me if they can start this or that vegetable, how the plant can possibly germinate in freezing temps (it can’t), or if you start your seeds on a schedule like you would when you’re seed starting indoors.

Winter sowing is not like indoor seed sowing!! There is no real “schedule” except get the plants out the door and on your deck before they germinate indoors and before all the freezing temps are over.

The plants will not germinate until they are actually warm enough in their milk jugs to do so. The only thing you have to do is make sure that once most of the outdoor temperatures are above freezing, that your jugs have enough water. That’s it. Let Mother Nature do the rest.

When do you plant your seedlings?

I generally check my jugs when the snow melts, which usually ends up being sometime in mid-April. Look to see if the soil is dry and water it accordingly. If you do not keep up with the water at this point, your winter sowing will not be very successful.

Once my seedlings have gotten a bit larger, around approximately 2-4 inches tall, I transfer them out into the garden. This usually ends up being around early-to-mid-May.

The seedlings don’t require hardening off, but they do require covering if the temperature dips to below freezing overnight.

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Winter Sowing was Originally Intended to Start Perennial Flowers From Seed

It’s one of the cheapest and easiest ways to grow new perennials–especially if you’re not lucky enough to know someone with an established garden who is willing to divide their perennials. Basically, if you find, seeds for perennial flowers, they are likely a good candidate for winter sowing. Like any first year perennial flower, these plants will be small and flower late their or maybe not even flower at all. However, in 3 to 5 years you’ll be rewarded with a beautiful full sized perennial that you didn’t have to pay a lot for.

Annual flowers and vegetables do not require cold stratification to grow, and were not originally intended to be started as seedlings using the milk jug method. However, some of them do work, and it’s a great way to start seeds without a south facing window, grow lights, or even space in your own home.

If you want to learn more about the process of creating your own milk jug garden, check out this post on winter sowing, or watch this YouTube video below:

Vegetables for Winter Sowing

  • Arugula
  • Asian Greens
  • Beets
  • Bok Choi
  • Broccoli
  • Cabbage
  • Cauliflower
  • Cress
  • Kale
  • Lettuce
  • Peas
  • Radish
  • Spinach
  • Spring Onions
  • Swiss Chard

Annual Flowers for Winter Sowing

  • Amaranth
  • Bachelor’s buttons
  • Bells of Ireland
  • Calendula
  • Cosmos
  • Larkspur
  • Marigold
  • Poppies
  • Sunflower
  • Strawflower
  • Sweet Peas
  • Zinnia

If there’s a vegetable or flower or flower that’s not on this list, it’s probably because it has too long of a date to maturity, or needs to be seed sown the traditional was with grow lights more than 4 weeks before the final frost. Using those rules, plants like snapdragons, tomatoes, brusselsprouts, artichokes, and peppers are not good candidates for winter sowing–especially if you have a short growing season.

I hope this list helps you in your winter sowing journey. Remember to keep track of it all in your garden planner, and happy growing!


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Kristen Raney

Kristen is a former farm kid turned urban gardener who owns the popular gardening website, Shifting Roots.  She is obsessed with growing flowers and pushing the limits of what can be grown in her zone 3b garden.  She also loves to grow tomatoes, but oddly enough, dislikes eating them raw.

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Filed Under: Uncategorised Tagged: Flowers, Vegetables, winter sowing

About Kristen Raney

Kristen is a former farm kid turned urban gardener who owns the popular gardening website, Shifting Roots.  She is obsessed with growing flowers and pushing the limits of what can be grown in her zone 3b garden.  She also loves to grow tomatoes, but oddly enough, dislikes eating them raw.

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Welcome!

Hi, I'm Kristen and I help new gardeners learn to grow their own vegetables and beautify their yards. I also share recipes that use all that delicious garden produce. Grab a coffee (and your gardening gloves) and join me for gardening tips, simple recipes, and the occasional DIY, all from the lovely city of Saskatoon, Saskatchewan.

P.S. First time gardener? You'll want to download the quick start gardening guide below!

Recent Posts

  • Protected: 5 Easy Ways to Increase Pollination in Your Vegetable Garden
  • Bloom Times: What Cut Flowers Grow When in Zone 3
  • The Best Vegetables & Flowers to Start with Winter Sowing
  • 21 Cut Flowers to Grow in Part Shade
  • The Best Grow Lights for Seedlings (from Budget to Bougie)

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Hi, I’m Kristen and I help new gardeners learn to grow their own vegetables and beautify their yards. I also share recipes that use all that delicious garden produce. Grab a coffee (and your gardening gloves) and join me for gardening tips, simple recipes, and the occasional DIY, all from the lovely city of Saskatoon, Saskatchewan.

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