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You are here: Home / Gardening Tips / Protect / Storing bare root trees/plants over the winter.

Storing bare root trees/plants over the winter.

Updated : January 11, 2021

24 Comments

Transplanting is a winter sport!

Transplanting season typically begins around Thanksgiving in most northern states. It lasts all winter and ends in very early spring before plants leaf out. Usually around mid April in cold states, earlier in warmer states. Once plants make leaves in the spring, digging/transplanting is over.

That means that if we growers want to buy plants in from a wholesale source and they are too big to ship with soil around the roots, we have to get them bare root. That means that you are having plants shipped to you pretty much in the dead of winter.

Not really a good thing. But it’s the way that it works.

I recently placed an order for about $7,000 worth of Japanese maples and the nursery that I ordered from starts shipping in February. Here in Ohio it can be pretty ugly in February. Usually the ground is frozen as hard as rock, the potting soil pile is frozen even harder.

But I want those Japanese maples sent to me in February while they are still dormant. If I receive them when dormant it’s easy to keep them dormant and that protects them against the freezing temps here in Ohio.

If I let them ship to me in March, from the west coast, they send me plants that are all flushed out with new, soft growth that would be very vulnerable. So I need to get them while dormant.

By the way, you might be wondering,

How Many Japanese Maples does $7,000 buy?

Hundreds of them! Some were around $12 each some were only $2.25 each. On that order I also have about 100 Weeping Redbud Trees and really awesome Rosy Teacups Pink Dogwoods. I think those were around $15 each.

By the way, in January 2021 I will be doing a Zoom Meeting with our Members about buying wholesale at prices like these. On that call I will reveal my sources. I cannot share wholesale sources here. The call will be recorded and available to members, even those who Join Later.

My dilemma is pretty simple. What in the world can I do with these trees in February to keep them safe and happy until we can get them planted or potted in the spring?

I know!

I’ll Build an Underground Bunker for Them!

Digging a hole for my underground bunker.
My underground bunker will be approximately 38 inches, wide, 32 inches deep and 8 feet long.
Building an underground bunker for bare root plants.
I am not using any mortar to secure these cement blocks. I am just dry stacking them. Good idea or bad idea? Ask me 12 months from now. But it will be fine until spring. If the soil pushes them in a bit over time it will be easy enough to fix.
It doesn’t look very big but this bunker will hold a lot of small, bare root trees. I’ll pack them in tightly. roots to roots, then cover the roots with potting soil before adding another layer to the stack.
Once this bunker is closed up it will not freeze inside the bunker. The natural heat from the ground will prevent that from happening. I’ve placed three totes of potting soil in the bunker so when my trees arrive I’ll have soil that is not frozen that I can use to cover the roots.
Because a full sheet of 3/4″ treated plywood is way too heavy for an old guy to be tossing around I made the cover into three pieces so I only have to open one end at a time if just need to get in there to add more trees. Of course I had to add some treated two by fours to make the plywood lay flat. More than likely I’ll flip these covers over so water doesn’t stand.

Some of the block is exposed because I wanted to make the inside of this box as large as possible and still only use lids that are 48″ wide. To keep the block from translocating cold into my bunker I pile some second hand straw over the entire cover and edges to keep the ground heat locked in. And the straw will be easy enough to move when I go to open things up in Feb to add the plants.

Once the soil settles around the outside of the block I’ll rake the area out. This is in an area of my property where nobody goes but hopefully the string will keep the deer and coyotes from walking on the cover. It would support them in they did. I just don’t want the soil on the outside of the block getting pushed in since the block are not mortared into place.

Cost? 80 concrete blocks at $2.35 each. They would have been cheaper if I bought them at a big box store but it probably would have taken hours to get loaded and it might have had to be done by hand. The supply yard loaded me in 10 minutes.

The wood for the covers was just under $100 if I remember correctly. It’s just one sheet of plywood and 5 treated two buy fours.

In this video you can see a similar bunker that I had years ago. It first appears just 22 seconds into the video. Then at 1:48 in the video you can see another system I devised for storing bare root trees above ground. I think the bunker is a better option, but the above ground application worked just fine when I used it.

This video is from this page; https://mikesbackyardnursery.com/2011/07/mikes-new-nursery-from-the-beginning/

Questions, comments or mean things to say? Post them below and I will respond.

Until then, by any and all means stay inspired!

Take a gander at these posts...

  • Protecting Plants from Frost
  • Over Wintering, Protecting Plants for Winter
  • A Step By Step Guide to Overwintering Geraniums
  • Overwintering Mums Outdoors the Easy Way
  • DIY Cold Frame

Comments

  1. Bill says

    February 23, 2024 at 9:14 am

    Received a bareroot Scarlet Red Dogwood in the mail. It is February and still prone to freezing in NJ. Instructions are vague. Dogwood is in the box with excelsior around roots in shipping bag. Tree is in the basement at 60 degrees, Please provide procedure to store until planting in April od Zone 7.

    Reply
    • Mike says

      February 24, 2024 at 7:26 am

      Bill,

      If you keep it inside it’s going to leaf out, not have enough light and will be too tender to plant out until late spring. I’d either plant it outside, which is what I’d do, or pot it and keep it below 45 degrees.

      Reply
  2. Jeanne Richardson says

    January 13, 2024 at 2:21 pm

    I have had these unpotted trees, with bare roots for about a week. I live alone and cannot physically prepare a spot like you. I also have no one to help me. I have an unheated storage building but no basement or garage I could use. Is there anyway, I can keep these trees alive until spring? I live in an earth home with a temp I leave at 70 degrees. So, do I have any options a 66 year old woman can accomp0llish on her own?

    Reply
    • Mike says

      January 14, 2024 at 8:14 am

      Jeanne,

      The roots of those trees must be covered with soil or mulch or wrapped in paper or towels and kept moist and they have to be kept from freezing, unless buried in the ground or in a pile of mulch or soil. Keeping them inside will bring them out of dormancy and the new growth will be light starved. The best way to keep them healthy is to keep them dormant until mid spring.

      Reply
  3. OLOLADE Matthew says

    January 25, 2021 at 2:37 am

    Hi Mike,
    I’m schooled by the day, thanks for all your videos and sharing. I have been following them so we’ll from Nigeria.

    Reply
    • Mike says

      January 25, 2021 at 9:25 am

      You are welcome Ololade!

      Reply
  4. Melody Arnett says

    January 24, 2021 at 7:17 pm

    I like your bunker, but I have a root cellar. Can I use it like your bunker?
    Thank you

    Reply
    • Mike says

      January 25, 2021 at 9:26 am

      Melody,

      You can but it’s best if the temp stays at 40 degrees F or below so the plants remain dormant. You don’t want them breaking dormancy with no sunlight.

      Reply
  5. Julie says

    January 24, 2021 at 2:26 am

    That soil you’re digging does not look frozen, much less rock hard! You’d never dig solid frozen with that small backhoe! Neat idea though, I just ordered 200 arborvitae I can’t plant until April 20th or later, when frost goes out. Planning to just pack the roots in damp sand and mist the tops weekly, keeping them at 40-50F and getting natural daylight. Fingers crossed!

    Reply
    • Mike says

      January 24, 2021 at 9:42 am

      Julie,

      It’s not frozen, that’s why I am digging it before it freezes. I can assure you, it’s frozen solid right now, but not inside the bunker. I’ll be adding the trees the week of 2/7/21.

      Reply
  6. Elizabeth A Gregory says

    January 23, 2021 at 7:38 pm

    I just read this article about your bunker system, but don’t understand how to stack the cuttings. Could your explain more or show a photo?

    Reply
    • Mike says

      January 24, 2021 at 9:43 am

      Elizabeth,

      I’ll add a photo once I have the trees in there. They are not cuttings, but small trees.

      Reply
  7. annie says

    January 23, 2021 at 3:35 pm

    You have such great ideas!

    Reply
  8. Harlan Lichty says

    January 23, 2021 at 11:58 am

    How do I find out what privileges I’ve signed up for and how to use them.
    I’ve lived in Hastings and presently reside in Randolph 55065. 15 – 20 year member.

    Reply
    • Mike says

      January 24, 2021 at 9:44 am

      Harlan,

      Contact Duston with your username, email etc. [email protected] or [email protected]

      Reply
  9. Robin says

    January 23, 2021 at 11:55 am

    Hi Mike,
    Last year I had a couple hundred red Japanese maples and Japanese lilac trees delivered and by the time they got to me I needed to get them planted FAST. It was such a wet spring in PA we couldn’t get our big tractor back in planting area. So we had a bunch of totes that we put our planting soil in and we planted them. They grew pretty well. We have built a larger area with shade for transplanting them in ground. Should we wait til March or April depending on weather to replant in ground?

    Reply
    • Mike says

      January 24, 2021 at 9:45 am

      Robin,

      Late March, early April before they leaf out would be good. If you can’t do that just get them out of the totes while dormant, loose then roots then heel back in until you can plant.

      Reply
  10. Ron Marcello says

    January 21, 2021 at 6:17 am

    HI mike, I placed an order for 10 small bare root Forsythias they should be arriving late Jan here in upstate NY (Rochester). Should I place them in a large pot with potting soil in my garage? Thank you, Ron

    Reply
    • Mike says

      January 21, 2021 at 10:01 am

      Ron,

      That should be fine, just water every once in a while to make sure the roots don’t dry out. A cold garage is a lot drier than you might think.

      Reply
  11. Kathleen OMeal says

    January 2, 2021 at 4:58 pm

    That under ground bunker is genius

    Reply
  12. Sharon Moreno says

    December 28, 2020 at 8:04 pm

    Mike, what would you recommend the depth should be for those of us living in colder climates than Ohio? I know water lines are buried 6″ here.

    Reply
    • Mike says

      December 29, 2020 at 8:22 am

      Sharon,

      I really can’t say. Here we bury water lines 48″ deep, but water meters in pits in front yards are only about 18″ below grade in a relatively small vault. I would think 32 inches with some insulation over the cover would be fine.

      Reply
  13. Mike Carter says

    December 26, 2020 at 8:44 pm

    Hi Mike, very interesting I’ve been transplanting as well. Just curious when is the best time to transplant rooted Formosa azalea plants? I grew these from cuttings this summer and I feel like now might be a good time to pot up? I’m in zone 7 so just had a good hard freeze

    Reply
    • Mike says

      December 27, 2020 at 7:47 am

      Mike,

      Now or early spring. Some things will heave out of the pots over winter if not rooted in. That’s why I’d wait until early spring.

      Reply

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