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10 Tomato Transplant Tips

Summer Sunrise Tomatoes Summer Sunrise Tomatoes

To the Northeast vegetable garden, late May brings a transformation almost as dramatic as the one of winter into spring because with the danger of frost finally behind us (we hope!) and the strong sun thoroughly warming the soil, it is time to move all seedlings outdoors and fill bare soil with plants.

Seedlings of the Solanaceous family – which include beloved tender crops such as eggplants, peppers, and tomatoes – have, along with their gardeners, been waiting for this moment since they were germinated in early spring. They can finally move from their stuffy indoor homes to summer in the great outdoors of a garden! Tomatoes, for somewhat mysterious reasons, have been elevated to superstar fame in many home gardens. Perhaps it’s because of their irreplaceable taste and versatility as an ingredient, or perhaps it is because it can feel like a great agricultural feat to raise a tomato from seed to the first ripe, juicy fruit. Either way, tomatoes embrace their celebrity status by being finicky and picky. The coddling that they received since germination has to be weaned off slowly and very gradually as the plants mature, but is essential before, during, and for a while after transplanting.  In general, tomatoes are more susceptible than most other common vegetables to fungal diseases, such as early blight. To grow healthy plants, maintaining good tomato hygiene is key – keeping them trimmed, trellised, clean of pests, etc., is essential.

 To give your tomatoes the best start in their outdoor life, follow the steps below:

PREPARE FOR TRANSPLANTING:

 

1. Harden off. If your tomatoes have been living in a warm, controlled environment like a greenhouse, cold frame, or living room, they need a little time to get used to the wilder climate outside. Give them a few days to adjust to the swinging temperatures, harsh sunlight and strong wind by bringing them outside for a few hours, then increasing to half a day, a full day, and finally a day and night.

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2. Watch the weather & be ready for cold swings. The weather won’t always cooperate, as we all know, but we need to be ready when it does. Tomato transplants are particularly sensitive to cold, and cannot withstand a frost. Frosts can occur when temperatures reach below 40 degrees. If there are forecasted lows around or below 40, wait to transplant. Sometimes, frost occurs late in the season, after it seems fine to transplant. Be prepared for late season cold swings with protective barrier such as row cover. For tomatoes, ALWAYS support the row cover with a frame such as our stainless steel hoops. Direct contact with row cover during a frost can damage the plants just as badly as the cold air can.

Seedy Savings

 3. Prepare the spot. Always plant tomatoes in full sun and if possible, do not grow tomatoes (or any Solanaceous plants) in the same location season after season. Rotating your crops and growing Solanaceous crops in the same spot no more than every three seasons reduces the spread of disease from year to year. When planning your rotations, keep in mind that too much nitrogen will result in large, leafy plants with few fruit. Wherever you grow them, be sure to provide rich soil. Yours plants will need 2 feet of space in between them, and 3-5 feet of space from other rows. Prepare the soil by adding 2-3 inches of compost, and lightly working it in to the top few inches of the soil. Be sure to smooth uneven spots in the surface, and tamp it down to create a nice, firm bed. Review our bed prep tips for more on how to create good, fertile garden beds.

4. Choose a cloudy day, or the cool of evening. To alleviate seedlings from shock, transplant on a cloudy day, or if it’s not in the forecast, plan toward the end of the day, when air and soil temperatures cool and the sun is won’t scorch the young plants.

5. Give space. Air flow is the most vital factor in preventing tomato blight, other fungal diseases, and even the spread of pests. Although in June, it may be tempting to squeeze as many tomatoes as a limited garden bed will allow (fueled by dreams of limitless summer salads or homemade tomato sauce through the winter) adequate spacing will pay off come harvest time in August.  We plant our tomatoes two feet apart.

TRANSPLANT:

1. Clean up. Before putting tomatoes in the ground, snip off the bottom-most branches and leaves of the seedlings. You’ll see why in step 8.

2. Un-pot carefully. When taking seedlings out of their pots, don’t break the roots. Place a closed palm over the base of the tomato with the stem sticking out in between your fingers, then use the same technique as building a sand castle using a bucket shape: tip the pot upside down, tap on all sides and bottom to loosen the plant’s grip, and gently pull the pot up to separate. If this doesn’t work, consider cutting the pot away – just don’t pull on the plant itself.

3. Tickle the roots. Loosening the roots will help the plant acclimate faster thus resulting in speedier growth, while but breaking the delicate roots will weaken the plant. To strike the right balance, gently wiggle your fingers through the outer edge of the roots to loosen them just slightly.

Ika Hoe

Ika Hoe

A heavy duty, high quality, japanese hand hoe that happens to be squid-shaped!

4. Plant deeply. Have you noticed the layer of fuzzy hairs at the bottom of tomato seedlings?  Those will grow into roots if they are below ground. Burying the little fuzzy hairs will give your tomatoes a stronger root base, preventing them from toppling over in the wind and allowing them to pull more nutrients up from the soil. However, planting deeper than that, or burying the bottom leaves and branches could result in fungal problems. Dig the holes wide and deep to accommodate the plant. We use our trusty Ika Hoe in our heavier, rocky soil, and the Hori Hori works nicely in finer, lighter soils.

5. Water when dry. Regular watering is important, but over-watering can increase the change of disease. Water your seedlings heavily immediately after transplanting; then hydrate them only when the soil dries out. The surface of the soil can dry quickly, but that doesn’t always mean all moisture is gone. To check, stick your finger in the ground: if it comes out wet, the plants still have some water to draw from; if it’s dry – it’s time to water.

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 LOOKING AHEAD:

A few weeks after transplanting, add a layer of straw mulch to help keep weeds and soil diseases at bay and regulate soil moisture. For more information on tomato trellising, take a look at Ken’s Tomato Trellising Basics.

Don’t forget to regularly check in on the young plants and monitor their health and growth. Stay on top of pest and weed watch – this is particularly important in the seedling stage, as the plants are too little to compete with persistent weeds and early season pests like cutworms and flea beetles. And, above all, remember that plants want to live. All we, as gardeners, can offer them is a healthy and caring environment to inhabit.

More helpful tomato and transplanting resources:

Tomato Pruning

Troubleshooting in the Tomato Patch

Transplanting and Troubleshooting

Three Ways to Choose Tomatoes for your Garden

15 thoughts on “10 Tomato Transplant Tips”

  • Ashling

    Wow....could have used this post before transplanting 36 tomato plants yesterday!! Can see at least three things I did wrong. Sigh.

    Reply
  • Kathy Carver
    Kathy Carver 05/28/2013 at 10:02 am

    I am wondering why it is not a good idea to plant a fruiting crop following a nitrogen fixing crop that was grown over the previous winter. I was not aware that it was a problem. Please enlighten me!

    Reply
    • Green Thumb

      too much nitrogen will prevent uptake of other essential nutrients, specifically those needed for flowering, calcium, magnesium, phosphorus, potassium.

      Reply
  • elizabeth Blackburn
    elizabeth Blackburn 05/28/2013 at 6:03 pm

    Any suggestions on preventing flea beetles. We have been hard hit this year on almost every crop. We are sick of dusting.

    Reply
  • ken

    They said not to plant tomatoes too many years consecutively in the same location. Your comment above suggests the right thing to do. Crop rotation is good. Thats good kathy

    Reply
  • Michelle Elliot
    Michelle Elliot 05/29/2013 at 3:10 pm

    Since I've moved to NY from California several years ago I have been growing toms from seed...using your seeds which have grow magnificent tomatoes. This year I'm trying something that I did only once in California (not with tomatoes)....a "lasagne" bed....alternating layers of nitrogen (green grassclippings/compost) with carbon (dry leaves,dry grass) On the top of this layering I've put organic soil from compost and mulch. You can do all this layering without ever disturbing the soil....encouraging the earth worms up to make more soil and saving my back. And you can plant as soon as you've made the rows....only seedlings, not seeds
    My concern is... now that I've actually done this..now that the little tomato seedlings are planted in these beds...will the roots be able to grow through those leaves or will they get choked off? I guess time will tell.
    Do any of you have any experiences/advice with this type of gardening?

    Reply
  • John

    @Michelle, I'm sure you found out that they will surely grow through it while consuming it. Plants will grow their roots around rocks and stones, they're going to appreciate the decomposing plant food you put into your bed.

    Reply
  • Michaela

    Can you please advise when would be a good time to plant seedlings outdoors in a zone 6/7 coastal climate. I was hoping to protect the plants with hoops and plastic cover for the first month until there is no sign of frost but can't really figure out when I could do that.
    Greatly appreciate your help.

    Reply
  • Jen

    I have three tomato plants in one pot and need to split them apart - is there a safe way to do is with the roots so tangled?

    Reply
    • Erin Enouen
      Erin Enouen 05/09/2016 at 7:31 am

      Hi Jen, If the tomatoes are small, and only have 2-4 leaves on them, you can gently pull them apart and pot each one up in its own container. Keep the soil moist for the first week, and don't let them dry out or get over heated. After a week they should start putting on new root growth and recover from any stress from untangling the roots. If your tomatoes are larger, there is more risk to damage the roots. I would focus on keeping 1 in tact in the soil, and gently untangling or removing the others and potting those up. That way, at least one will do well, and there is a good chance the others will recover.

      Reply
  • Diane

    I have started Principe Bohrgese from seed and I am just starting to get "true" leaves. The plants are still in their starter trays. I have them in a cold frame starting today...a little overcast so not in direct sun yet. I am in Zone 5 in Buffalo, NY. When should I start using fertilizer?

    Reply
    • Erin Enouen
      Erin Enouen 05/09/2016 at 7:33 am

      Hi Diane, Now that your plants have started getting their true leaves, consider potting them up into a larger container with a good, fertile, organic potting mix. Typically these mixes have enough nutrients in them to keep the tomatoes happy for 4-6 weeks, at which point they will be ready for transplanting.

      Reply
  • Ryan

    The Wifey brought home a mature 3ft potted Beef steak tomato plant . I just transplanted it this evening, into a much larger pot with a cage.
    It has already flowered, but hasn't shown any signs of producing.
    Question is, Do I need to clip the flowering buds off?

    Reply
  • Kathryn

    Hi. I'm a new gardener and have been enjoying it so much! But I'm guilty of stuffing too many plants into my garden plot!! I had no idea the tomato plants would get to be so big and wide!! They are too close to each other and I'm worried about them. Is it possible to transplant them to another spot? Or move from the ground to a large container?? They have all become about 3 feet tall and a good 2 or so feed wide. They seem quite sturdy and have already produced some fruit (others just have flowers). Anyway- I'm worried I will kill them off if I move them at this stage. But just wondering from others who are more experienced. Thanks for any info on this! (Also have same problem with some jalepenos plants- so same question for them too!!) at least now I know for next years garden!! :)

    Reply
    • Erin Enouen

      Hi Kathryn-I love hearing that you are loving your garden this year! And congrats on getting your plants so big and healthy. One question I have is-how close are your plants planted? When they are as big as you say, I don't think digging them is an option. However, you can prune them, or depending on how close they are, sacrifice a few for the remaining, or, just let them be crowded and see what happens! We plant our tomatoes anywhere from 18-24 inched apart in rows that are spaced anywhere from 42-60 inches apart. This is for increased airflow and ease of trellising and harvest. http://www.seedlibrary.org/blog/pruning-tomatoes/

      Reply

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