Link to StumbleUpon

Tuesday, March 29, 2011

What to Plant Before the Last Frost

As the snows dissipate and the sun shines longer, gardeners are chomping at the bit to put seeds and plants in the ground. Depending on your location and planting calendar, you can probably get things started now. The key is knowing which plants can handle cold soil and cold nights. The solution is cool season vegetables.

Cool season vegetables are the ones that you can put in your garden beds before the last frost. Early spring planting is ideal. They can handle a light or moderate frost, survive, and prosper. Some of them even prefer a few frosts to develop flavor and provide the maximum yield. Most of them don't like the high temperatures of summer.

Cool season plants that should thrive in cool conditions include: broccoli, Brussels sprouts, cabbage, cauliflower, celery, kale, kohlrabi, lettuce, mustard greens, onions, peas, potatoes, radish, rutabaga, spinach, turnip. Beets, carrots, chard, and parsnips are cool season vegetables that can also handle warmer temperatures of summer.

A few of the seeds I'm sowing before the last frost.

These vegetables do very well as the daytime temperatures climb in spring. When the thermometer climbs beyond 80 F, they'll begin to suffer. When the days lengthen in summer and the temperatures climb above 85 F, most cool season plants begin to "bolt". That's when the plant sends up a flower stalk, signaling the end of leaf production and the beginning of seed production. Cabbage, lettuce, kale, and spinach will all taste worse after they bolt.

Most of these cool season vegetables do best when planted two to four weeks before the last frost. Individual seed packets will offer guidance for specific planting time. With a little preparation, you can get them in the ground and growing long before the rest of your garden.

Sow the seeds directly into the soil. Check your soil temperature before planting. As long as the soil is above 40 degrees F, the seeds should germinate if kept moist in an amended soil. A few of the plants like cabbage, chard, potatoes, and turnips will do better if the soil is at least 50 degrees F. For best results some of these vegetables do better as young plants rather than seeds; transplant broccoli, cabbage, cauliflower, and onions if you have the option.

The air temperature shouldn't be more than a few degrees below freezing on the coldest nights and should be consistently above 40 degrees F during the day. You can do a few things to help protect the plants while night temperatures remain low. Mulching the young plants with straw or grass can help insulate them and moderate soil temperatures. Row covers will help protect plants from a light frost. If a hard freeze below 28 degrees F is forecast, cover the plants with a sheet or blanket overnight; plastic will work, but can freeze any leaves or plants that it touches.

I encourage raised beds covered by a mini greenhouse. That's what I'm using. The plastic cover helps generate warmth during the day and reduces the cold at night when the soil radiates its warmth. Even on cold days, the cover keeps the plants warm if the sun is shining. On very warm days, the cover should be opened to allow airflow to keep plants from overheating.

One of my early spring planting beds.

There are perennial vegetables that also fall into the cool season category. Asparagus, horseradish, and rhubarb are great additions to a garden and will return year after year. All three can be planted as soon as the ground can be worked in spring; when it's no longer frozen. They will be among the first of your plants to break ground in future years. Choose their home carefully because they'll become permanent fixtures in your garden once established.

If you have limited room in your garden, cool season vegetables can provide multiple harvests in the same plot. An early planting of lettuce or spinach will provide ample produce for your kitchen. Just about the time they begin to suffer from higher soil and air temperatures, you can remove them and plant tomatoes or squash in the same space. The combination of cool season vegetables early in the season and warm season vegetables later in the season is endless.

Here's another secret to keep in your back pocket. Many of these cool season vegetables will grow well in the fall too. A late summer planting will provide a harvest after the first frost of fall. You may get three different crops in the same garden plot. Look forward to more information about that when I discuss it during the summer.

For now, enjoy an edible garden with frost on the ground. By the time you start thinking about planting tomatoes, squash, and corn, you'll already have harvested radishes, lettuce, peas and more wonderful, cool season vegetables. It's not too early to begin.

Here's the video of the mini greenhouse:



Here's a link to "Extending Your Growing Season with Mini Greenhouses"




As the snows dissipate and the sun shines longer, gardeners are chomping at the bit to put seeds and plants in the ground. Depending on your location and planting calendar, you can probably get things started now. The key is knowing which plants can handle cold soil and cold nights. The solution is cool season vegetables.

Cool season vegetables are the ones that you can put in your garden beds before the last frost. Early spring planting is ideal. They can handle a light or moderate frost, survive, and prosper. Some of them even prefer a few frosts to develop flavor and provide the maximum yield. Most of them don't like the high temperatures of summer.

Cool season plants that should thrive in cool conditions include: broccoli, Brussels sprouts, cabbage, cauliflower, celery, kale, kohlrabi, lettuce, mustard greens, onions, peas, potatoes, radish, rutabaga, spinach, turnip. Beets, carrots, chard, and parsnips are cool season vegetables that can also handle warmer temperatures of summer.

A few of the seeds I'm sowing before the last frost.

These vegetables do very well as the daytime temperatures climb in spring. When the thermometer climbs beyond 80 F, they'll begin to suffer. When the days lengthen in summer and the temperatures climb above 85 F, most cool season plants begin to "bolt". That's when the plant sends up a flower stalk, signaling the end of leaf production and the beginning of seed production. Cabbage, lettuce, kale, and spinach will all taste worse after they bolt.

Most of these cool season vegetables do best when planted two to four weeks before the last frost. Individual seed packets will offer guidance for specific planting time. With a little preparation, you can get them in the ground and growing long before the rest of your garden.

Sow the seeds directly into the soil. Check your soil temperature before planting. As long as the soil is above 40 degrees F, the seeds should germinate if kept moist in an amended soil. A few of the plants like cabbage, chard, potatoes, and turnips will do better if the soil is at least 50 degrees F. For best results some of these vegetables do better as young plants rather than seeds; transplant broccoli, cabbage, cauliflower, and onions if you have the option.

The air temperature shouldn't be more than a few degrees below freezing on the coldest nights and should be consistently above 40 degrees F during the day. You can do a few things to help protect the plants while night temperatures remain low. Mulching the young plants with straw or grass can help insulate them and moderate soil temperatures. Row covers will help protect plants from a light frost. If a hard freeze below 28 degrees F is forecast, cover the plants with a sheet or blanket overnight; plastic will work, but can freeze any leaves or plants that it touches.

I encourage raised beds covered by a mini greenhouse. That's what I'm using. The plastic cover helps generate warmth during the day and reduces the cold at night when the soil radiates its warmth. Even on cold days, the cover keeps the plants warm if the sun is shining. On very warm days, the cover should be opened to allow airflow to keep plants from overheating.

One of my early spring planting beds.

There are perennial vegetables that also fall into the cool season category. Asparagus, horseradish, and rhubarb are great additions to a garden and will return year after year. All three can be planted as soon as the ground can be worked in spring; when it's no longer frozen. They will be among the first of your plants to break ground in future years. Choose their home carefully because they'll become permanent fixtures in your garden once established.

If you have limited room in your garden, cool season vegetables can provide multiple harvests in the same plot. An early planting of lettuce or spinach will provide ample produce for your kitchen. Just about the time they begin to suffer from higher soil and air temperatures, you can remove them and plant tomatoes or squash in the same space. The combination of cool season vegetables early in the season and warm season vegetables later in the season is endless.

Here's another secret to keep in your back pocket. Many of these cool season vegetables will grow well in the fall too. A late summer planting will provide a harvest after the first frost of fall. You may get three different crops in the same garden plot. Look forward to more information about that when I discuss it during the summer.

For now, enjoy an edible garden with frost on the ground. By the time you start thinking about planting tomatoes, squash, and corn, you'll already have harvested radishes, lettuce, peas and more wonderful, cool season vegetables. It's not too early to begin.

Here's the video of the mini greenhouse:



Here's a link to "
Extending Your Growing Season with Mini Greenhouses"




5 comments:

  1. Awesome, Very informative. I will be back to read more after I've started some my these cool season veggies! YAY! Thanks Scott

    ReplyDelete
  2. Thank you. Enjoy your cool season plants.

    ReplyDelete
  3. Hi Gardener Scott! Great info. I would love to see a tutorial for your mini-greenhouse if you have one, or ever write one!

    I'd like to invite you to share this post and up to two others at Farm Girl Blog Fest #17 (don't let the name fool you--farm boys can post too!), which is live right now. You would be a great addition to the wonderful posts that are shared!
    http://thismindbeinyou.blogspot.com/2013/01/farm-girl-blog-fest-17.html

    Hope to see you there!
    ~Kristi@Let This Mind Be in You

    ReplyDelete
    Replies
    1. Kristi,

      You can view my video tutorial of the mini greenhouse at: http://www.youtube.com/watch?v=8YPyIAwGkAU

      The blog tutorial is at:
      http://gardenerscott.blogspot.com/2011/03/extending-your-growing-season-with-mini.html

      That's my blog "Extending Your Growing Season with Mini Greenhouses" from March 2, 2011.

      I'll add those links to the blog above. Thanks.

      And thanks for the blog invitation.

      Delete
    2. Thanks Scott! I'd love to watch the video and see the tutorial, as I've never built anything like this before.

      Don't forget to add your post to the Blog Fest so that people can click over from my blog to yours! If you want to, but need some help, feel free to email me from my blog, and I'd be happy to tell you how. :)

      ~Kristi@Let This Mind Be in You

      Delete