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    Home » Vegetable Gardening

    How to Harden Off Vegetable Plants. Front Yard Garden Update

    May 13, 2012 by Karen 60 Comments

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    As you know, I was once married to a stuffed animal. No wait. Wrong story.

    As you know, I'm growing my own vegetables from seed this year. I ordered a bunch from Cubits and Twig & Tree and hoped for the best about a month and a half ago.

    Right about Easter as a matter of fact, I got out all of my soil, pots, and seeds, threw the grow lights on and got to work.  I planted heirloom tomatoes, basil, Amish Cockscomb and a few other things including sweet potatoes.

    So far so good as they say.

    In less than 2 months I am now preparing my plants for their big move from a cramped condo with artificial lighting to their spacious new home with lots of natural sunlight and a really great landlord, I might add.

    It's now time to harden off.   Hardening off is getting your plants acclimatized to their new environment.  You can't just take a plant you grew indoors and throw it outside and wish it well.  It will up and die on you immediately.  And then it might punch you in the nose.

    For your plants to grow up into healthy happy, vegetable producing adults, you need to harden them off.  I keep saying harden.  Heh.

    Basically all you have to do is take your plants outside for a few hours, increasing their time spent outside by a few hours, every day for around a week.

    Everyone does it a bit differently, but this is a hardening off schedule you can use because you don't have any other friends to help you with hardening. Off.

     

    • Day 1 - Set plants outside in the shade, protected from wind and direct sunlight for 3 hours.  Bring  inside.
    • Day 2 - Do the same for 6 hours.  Bring inside.
    • Day 3 - Do the same for 9 hours.  Bring inside.
    • Day 4 - Set the plants where they get a little less shelter for the day.  A tiny bit of breeze and sun can hit them now.  Not for HOURS and HOURS.   1-2 hours in a partly sheltered area.  Bring inside.
    • Day 5 - Same as Day 4, but allow 1-2 hours of direct sunlight.  Bring inside.
    • Day 6 - Allow the plants a bit more sun than they had the day before.  (allow them to stay outside all night for the first time unless it's unusually cold.
    • Day 7 - Set the plants out so they're in the sun most of the day and leave them outside at night again.
    • Day 8 - Plant your plants outside.  (do NOT plant outside if frost is still a possibility)

     

    A tip for keeping your tomatoes frost free courtesy of the Good Dr. Richardson, is to do as the Mennonites do.  Plant your tomatoes really deep and if frost is expected just put a plastic bucket over each of them for the night.  Those Mennonites.
    You can extend your hardening off to 14 days as well to be extra safe and sure.
    This is especially important for things that aren't in love with the cold.  Like tomatoes.  I grew a few varieties this year. And many of them.  Too many.  Wayyyy too many.  I will be giving away a LOT of tomato plants once they're hardened off.  One goes to the Good Doctor for his excellent Mennonite bucket tip.
    Tomato

     

    I'm also growing one flower.  Cockscomb (Celosia).  This Amish cockscomb is also a heritage seed which I bought from Linda at Twig & Tree.  Which, for some reason, whenever I type it out, I type Twit & Tree.
    5
    Once it blooms, Cockscomb looks like this.  I figured, if I was going to grow one flower, given my newfound hobby of hen farming ... Cockscomb was the way to go.

     photo via Twig & Tree (where I ordered this seed from)

     

    Also grown from seed, Acorn Squash.

    Would you like to save this stuff?

    We'll email you this post, so you can refer to it later.

    6

     

    Several Basil plants which I've already pinched back to promote bushy growth.
    7

     

    And then there's the Great Sweet Potato Slip experiment.    Around the same time I started my tomatoes I started sweet potato slips.  I experimented with about 6 sweet potatoes all bought at different places at different times.
    3 of them look like this.  Nothing.   Not a root, not a sprout, nada, nothing.  Zip.
    1

     

    One sweet potato is barely trying to sprout.
    2

     

    The much heralded "Organic" sweet potato isn't doing much better.  So much for that theory.
    3

     

    Finally, there's this great big mother of a sweet potato.  It's got sprouts coming out in all directions and they're just starting to grow really quickly.
    These will be the slips I plant, plus the white organic sweet potato if it ever amounts to anything because it's a different variety.  I'm not sure what this big one is, but my best guess would be Beauregard.
    4

     

    And finally ... a look at what is probably the most impressive thing from my garden yet.
    Asparagus.  Which I was assured wouldn't be ready for cutting for at least another year or two.
    Tada!

     

     

    Asparagus

     

    Ahem.  Cough, cough.

     

     

    →Follow me on Instagram where I often make a fool of myself←

     

    More Vegetable Gardening

    • 5 Delicious Things To Make With Rhubarb
    • The Encyclopedia of My Vegetable Varieties
    • What I'm Doing The Easter Weekend
    • Cold Stratification & The Seeds That Love It

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    1. Trisha

      May 25, 2012 at 7:10 am

      Hi Karen, also doing tomatoes from seeds (first time gardener) and I used your wonderful guide and so far successful (although some are a little spotty). They just spent their first night outdoors and it's suppose to rain all day, and pretty much all of this upcoming week. Saturday is suppose to be nice so I was planning on planting them then. Any tips or advice on the rain or am I being an overprotective parent and should stop worrying?

      Reply
      • Karen

        May 25, 2012 at 9:44 am

        Trisha - You probably need to worry about wind and sun more than rain. It depends on how long you hardened them off for. As long as they've become accustomed to being outdoors and the wind and sun on them they should be fine. Just make sure you give them some kind of support and you're good to go. (trellis, tomato cage ... anything to keep them from toppling over in the rain) ~ karen

        Reply
    2. Alex

      May 19, 2012 at 9:29 am

      Hardening. Got it. Going to add that to the list of things I didn't know about starting a veggie garden. Filed under the category of Everything. This is really helpful!

      Reply
      • Karen

        May 19, 2012 at 9:41 am

        Hah! If you buy your plants from a garden centre you don't need to worry about hardening them off. They'll already be hardened off. It's only if you grow them from seed yourself that you need to harden off. ~ karen!

        Reply
    3. Bols

      May 18, 2012 at 3:16 pm

      I am planting my tomatoes this weekend come hell, frost or high water.
      I plant only 4 cherry tomato plants in a huge pot that my neighbours graciously allow me to keep in their front yard (right off my driveway) as much back yard does not have enough sun in one spot for the tomatoes to thrive (unless I put them dab smack in the middle of the lawn). It looks like they are starting to get tired of my attempts to acclimatize them so I better get them into the pot or I will lose them.

      And speaking of California - I was in the San Francisco area last year in the fall (vacation) and I swear I am moving there as soon as I win 6/49 - although I would probably head to northern Cali, closer to Oregon as the San Fran area does not get rain for my liking.

      Reply
    4. Kristen S

      May 16, 2012 at 12:19 pm

      I cheated, and purchased starter plants from Fiesta Gardens. BTW if you lived in Toronto you would love this grocery store (Fiesta Farms) it is a independent grocery store that focuses on local, organic and artisanal products that everyone can afford. Amazeballs. Anyhoo, they have a fab garden center with absolutely everything you could wish for (except edamame beans, damn I should have planted those from seed.) I walked out with two flats of everything I need to plant this weekend. Used your garden creation software link (awesomesauce!) and have it all planned out. Now, my only concern is keeping the darn dog out of the garden. :S

      Reply
      • mothership

        May 26, 2012 at 11:52 am

        Hi Kristen-
        I recently saw a front yard garden... with a chain link fence & a barky boxer.... they had a raised bed garden (with wood fencing board sides) & a wooden lattice laid over (supported by the wooden sides) with the veggies growing in the spaces.... I am assuming the dog didn't like tripping through the lattice?

        Reply
    5. Nikki Kelly

      May 16, 2012 at 10:04 am

      Ok, you need to elaborate on the pinching the basil back to make it more bushy statement. Mine always grows really tall and flops over. Oh and if you could write a post about exactly what to do with all the herbs that are taking over (particularly sage, oregano, basil, and thyme) that would be much appreciated. I'll be early awaiting your answers.

      Nikki

      Reply
      • Karen

        May 16, 2012 at 10:19 am

        Nikki - O.K. I'll do a pinching post. ~ karen

        Reply
    6. Anemone

      May 15, 2012 at 4:51 pm

      I cheated. With the sweet potato slips. I took one out of the cupboard that was already sprouted. I had stick it in water like you showed and now there is long roots. I hope the slips grow taller. I just hope something happens soon.

      Reply
    7. Melissa L.

      May 15, 2012 at 12:06 pm

      I've been in California for the last 27 years, and have never been much of a fan, but seeing as I start my seeds out of doors, and already have zucchini, crook neck and cucumbers ready to harvest, and beans and tomatoes hanging on their vines, well, I guess I'll be grateful to live here (just for today). Happy hardening!

      Reply
      • Karen

        May 15, 2012 at 12:14 pm

        Thank you. :) I was just at the garden centre yesterday and it was PACKED. The second it's safe to plant outside (around Mother's Day) the garden centres are FULL of excited people picking out plants and planning their gardens. And I actually thought to myself, I guess in places like California, they don't have this BURST of Yay! We can all get outside and plant excitement in the air once a year. ~ karen!

        Reply
    8. Kera

      May 14, 2012 at 11:11 pm

      We put our tomatoes under a plastic milk jug- gallon size- if the parts you live in have milk in jugs, that is.
      Cut the bottom off the jug, snug it down in the soil around the tomato, screw the cap on and let it be. On really warm days or if I need to regulate the temp inside the jug I take the cap off. When the tomato plant fills the jug I remove it and recycle it!

      Reply
    9. Jen

      May 14, 2012 at 7:28 pm

      This is why your sweet potatoes won't sprout:
      http://www.youtube.com/watch?v=exBEFCiWyW0

      Reply
      • Karen

        May 14, 2012 at 7:32 pm

        Hi Jen. Yes, I've seen that video. It's cute! However ... what's funny is contrary to popular belief organic vegetables are sometimes sprayed with sprout inhibitor. That's the thing about organic. It's not "completely" regulated. My organic sweet potato isn't doing nearly as well as my non organic. They're a real crap shoot these sweet potatoes. ~ karen!

        Reply
    10. Nicole2

      May 14, 2012 at 4:33 pm

      Karen,

      Thank you for sharing your advice on how to harden my cockscomb. Seems I've been doing it wrong all these years....

      Reply
      • Karen

        May 14, 2012 at 4:35 pm

        I'm here to help. I'm very wise. ~ karen

        Reply
    11. Gayla T

      May 14, 2012 at 4:22 pm

      This is so exciting! I've long since gotten over the thrill of it all. Just as in bringing human life into the world, baby plants are a miracle. Actually,it's a miracle if you don't kill them but I guess that's true of the human variety now. If you are not home to harden your plants, look into a cold frame with a timer. They are a bit pricey but last the rest of your life. Actually, Karen will know how to build one on a post in the future, I'm sure. Making the little motor might be a stretch but you could buy one and still have a good tutorial. Mine did not actually last my life but died in a hail storm. I've only ever grown a sweet potato to entertain kids since I'm not a fan of eating them. I just figured you cut them up and planted them like Irish potatoes. Live and learn said the old dog.

      Reply
    12. Karol

      May 14, 2012 at 3:48 pm

      Wow! I had no idea people had to go through all this crap to get plants to grow. Here, we just stick them in the ground and we're good-to-go. I say "we" as if I am participating in plant growing. Ha! "not I" said the pig.

      Reply
    13. Evalyn

      May 14, 2012 at 1:52 pm

      The bucket acts as a hotcap, which is a little paper dealy you can buy at gardening stores. -OR- you can cut the bottom out of a plastic jug large enough to fit over the plant, leaving off the lid, and it will act like a little green house to keep the nasty frost off your tender little sprouts. Remove at first light to prevent par-boiling.

      Sweet potatoes are finicky, persnickety, selfish little organizms. They sprout when and if they are damn well ready. *cough* In my opinion.

      Reply
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