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You are here: Home / Gardening / Dig Deep for A Successful Tomato Harvest

May 17, 2024 By Candace Godwin Leave a Comment

Dig Deep for A Successful Tomato Harvest

I love tomatoes. Specifically, I love growing tomatoes. Did you know there are 10,000 varieties of tomatoes? I think I’m on a mission to grow them all.

Seriously, for me there is no greater joy than picking that first big, juicy tomato in the summer. Every gardener should experience that joy (and that mouthwatering taste).

I’ve been asked if it’s possible to grow large beefsteak tomatoes here in northern Idaho. Yes, it is!

There are more than 10,000 varieties of tomatoes!
Large beefsteak tomato over 1 pound in weight
Yes, it is possible to grow large tomatoes in our region.

The keys are to select early varieties that will produce fruit in under 90 days and to get your plants off to a good start with proper planting and care. Here are a few tomato-planting basics to help you achieve a big, juicy success this year.

Before You Plant

First things first, are your tomato plants hardened off? This is the process of acclimating indoor-sown transplants to outdoor conditions.

Plants purchased from a reputable nursery or local grower will have most likely been hardened, but it’s always a good to ask.

Next, keep an eye on the weather forecast. We’re past our last frost date for Coeur d’Alene, Post Falls, Rathdrum, and Hayden, but outlying areas can still be at risk for a light frost into June.

Remember, tomato plants require warm soil (at least 50⁰F), along with warm air temperatures to grow and thrive. I don’t plant my tomatoes until the overnight temperatures are consistently at 50⁰ or more – that could be mid-May or the end of May.

And, since Mother Nature has been known to toss a few hail balls our way well into June, have frost protection at the ready. A floating row cover or cloches made from milk jugs can protect young plants from cold wind and rain.

When to Plant

Once conditions are optimal, it’s time to plant – unless it’s a beautiful, hot sunny day. Wait, what?  Unfortunately, too much intense sun and heat can quickly wither young plants that are trying to adjust to transplanting.

To help ease transplant shock, try to plant on a calm, overcast day.

If at all possible, strive to plant on a calm, overcast day or time your plantings for later in the afternoon when the sun isn’t so intense.

Into the Deep

Tomatoes should be planted deep, whether you’re planting them in the ground or in a container. By deep, I mean approximately two-thirds of the stem goes below the soil, with one third above. Gently pinch or cut off all stems two-thirds down the plant. This pertains to any size transplant – even dwarf varieties.

Before planting, remove the lower stems from the tomato plant.
The tomato should be planted deep so that just the top one-third of the plant is above the soil level.

Why so deep? The reason is all about the specialized cells, called parenchyma, that are found along the plant’s stems. You may have noticed bumpy nodules around the base of your mature tomato plant; those are the parenchyma cells, also known as adventitious roots.

Above ground these cells help with photosynthesis, but when they are below ground, they turn into roots. More roots mean more opportunity to take up nutrients for a stronger, healthier plant.

If planting deep isn’t possible, the trench method is a good alternative. Trenching is where the plant is placed on its side in a trench and the roots and lower two-thirds of the plant are covered with soil. The top of the plant is gently bent upward. This method is just as effective as deep planting, but there is a greater risk of breaking the upper stem – so use caution.

Trenching is another effective planting method, however you need to use caution when bending the top portion of the plant.

For container planting, choose one that has at least a 5-gallon capacity and is 16 inches deep. This provides adequate space for roots. Dwarf tomato varieties can be planted in 2-gallon containers with a 12-inch depth. And, one plant per container, please!

Space your tomatoes 18 to 24-inches apart to allow for good air circulation between plants.

Growing On

Tomatoes are vining plants and most need some support. It’s best to do this at planting time when the plants are small and manageable. Wire cages, wooden stakes, and cattle panels offer strong support.

tomatoes growing along a cattle panel
A cattle panel makes a great tomato support.
Tomato vines are weaved throughout the panel during the season to provide support.

When it comes to watering, slow and deep at the base of the plant is optimal. Strive for one to two inches of water per week.

Avoid overhead watering and direct water to the base of the plant where it is needed.

Quick, shallow watering produces shallow roots and unstable plants, and overhead watering can promote disease. Plus, very little water actually makes it to the base of the plant, where it is needed. Adding a layer of mulch (dried grass, leaves, or straw), will help to retain moisture and prevent weeds.

To help to prevent soil-borne diseases from reaching plant leaves, prune off the lower stems and any leaves from upper stems that may reach the soil.

To prevent soil-borne diseases, once planted, remove the lower stems and any leaves that may reach to the soil level.

Container-grown tomatoes require regular feeding with a slow-release organic fertilizer and watered frequently, especially during times of high heat.

Within a few days of planting, your young tomatoes will begin to “green-up” and show signs of new growth. Continue to watch your plants for any signs of disease or pests throughout the season. Love your tomatoes and they will love you back with a bounty of juicy, homegrown goodness later this summer!

Heirloom tomatoes cut and ready for a tomato tart | The Coeur d'Alene Coop
The prize that awaits you in the summer!

Filed Under: Gardening, Growing Tomatoes Series Tagged With: container gardening, deep planting, growing tomatoes, mulching tomatoes, parenchyma cells, planting heirloom tomatoes, pruning tomatoes, tomato planting, tomato roots, tomato support, tomatoes, trench planting

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Day #3 of plant pick up! Garage: full of plant ord Day #3 of plant pick up! Garage: full of plant orders. Greenhouse: full of plant orders. Garden: full of plants to be packed. Nine more days to go. Happy times for everyone! 🌻🌿🍅🌶🫑🥬🫛

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