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Johnny's Trial Greenhouse in Albion, Maine

Trellising &
Crop Support


Advantages of Trellising • Main Types of Trellising Systems • Setting Up Your Tomato Trellis

by Andrew Mefferd, R&D, Johnny's Selected Seeds

Your Back Will Thank You!
Trellising Benefits:
Ergonomics, Quality & Yield
Tip: It's always best to handle tomato plants only when they are dry — not when they are wet.

The advantages of trellising make it a popular technique for use with many vining crops.

  • Growing the vines on a trellis will keep them out of pathways.
  • Trellising makes fruit easier to find, speeding and improving the ergonomics of harvest.
  • Trellised vines can be grown at a higher density than vines that are sprawled, since they can make use of the vertical space over the plant, instead of growing into each other — which optimizes yield.

Trellising is especially important for tomatoes, where all these advantages apply and then some. Keeping the vines off the ground reduces exposure to soilborne pathogens, which will keep the foliage healthier. Airflow is better around trellised plants, which keeps the canopy drier and less vulnerable to fungal diseases.

For these reasons, most fresh-eating tomato crops are trellised.

Johnny's Tomato Comparison Charts
Match your trellis to the vine
The growth habit of the plant governs the type of support it needs. Match your trellising system to the tomato variety, as well as your particular needs and resources.
INDETERMINATE Tomatoes Comparison Chart »
DETERMINATE Tomatoes Comparison Chart »

There are a lot of different options for trellising tomatoes. The system that will work best for you depends mostly on:

  • The type of tomato you are growing
  • Where you are growing it
  • How much labor you want to put into it

Most tomato trellising methods are variations on either the basketweave system or the stake-&-wire/hanging-string system. Each has its merits, and growers prefer to use them in lots of different ways.

Generally, basketweaving methods are best-suited to the bushier types of tomatoes — determinates and semideterminate varieties — and the hanging trellises most useful for the rangier, indeterminate varieties.

Below are the basics to help you choose and learn how to implement a system that will work well for your growing situation.

Organic Defiant Tomatoes on Basketweave Trellis
Tomatoes on Basketweave Trellis in the Field
We used basketweave trellising in our organic trial fields to grow Defiant PhR, a determinate, midsize, disease-resistant slicing tomato.
By late August, all that's visible of the basketweave are the top strings — the plants are upright, robust, and producing plenty of delicious ripe fruit!
Defiant PhR »
Basket-weaving is the most common way to trellis determinate tomatoes in open field or protected culture, and it is occasionally used for indeterminate tomatoes. It is a labor-saving method of tomato trellising, when pruning is not important. Though it is quicker than other trellising methods, it makes the plants difficult to prune when they are surrounded by support strings. That is why this method is so well suited to determinate tomatoes, sometimes referred to as "self-pruning," since they grow to a certain size and then concentrate on fruit production. Most determinate and semideterminate tomato varieties can be basket-weaved without any pruning at all.

Indeterminate tomatoes can be basket-weaved as well, with one of two disadvantages. If they are pruned, this will be more difficult and time consuming. And if they are not pruned, fruit size will go down due to the sheer number of fruit set on an unpruned indeterminate plant. Also, unpruned, basket-weaved indeterminate plants will form a hedge of foliage which is susceptible to fungal diseases that can get started in the dense canopy. Unpruned, indeterminate basket-weave tomato production is mostly confined to arid areas because disease problems can be severe in humid areas.

Basketweave Set-Up

Twine in Box - With Belt Loops
Twine in a Box — with Belt Loops
Stakes. Strong cedar or hardwood stakes, or metal T-posts, should be driven into the soil at the end of each row, and between every other plant. Start each row with a post, skip two plants, drive a post, and keep driving a post every two plants all the way down the row. Use posts that are as tall as you expect the tomatoes to be, taking into account the foot or so that will be driven into the ground: 4-foot posts may be used for some bushy determinates, whereas 7-foot posts may be necessary for tall indeterminates.

Wand & Twine. When plants are about a foot tall, before they start to flop over, twine is tied to the end post, then looped around each stake down the row. At the end of the row, the twine is looped around the post at the opposite end, then looped around each stake on the way back so there is a string running along both sides of the plants to keep them upright. Additional strings are added higher up as the plants grow, every 8"–12", or before they flop out of the trellised area.

Our tomato twine is well suited to this job. The box it comes in has slits in the sides, so you can wear it on your belt and not have to hold it as you walk down the row.

This leaves your hands free to use another tool that makes basket-weaving easier — a wand made of a short length of PVC pipe or a stick with holes drilled in each end. The twine can be passed through the wand and tied to the first post, extending your reach so you don't have to bend over as you go. (See videos showing technique, listed below.)

Not only will the wand speed up your work, but your back will thank you at the end of the day.

Stake & Wire Method
Stake-&-Wire Method in the Field
We used metal U-posts, #9 Wire stretched horizontally, and Sisal Twine hung vertically in the trial fields here at Johnny's Research Farm in Albion, Maine.

View our Facebook Photo Gallery depicting this method »

The stake-&-wire/hanging-string system can be used both in the field and in protected-culture settings, and works well for pruned, indeterminate tomatoes.

This system makes it easy to prune and trellis indeterminate tomatoes because each stem gets a string, and any additional suckers are pruned off.

An indeterminate tomato plant with five or six fruiting clusters can exert 10–12 pounds of downward pull on its trellis, so pruning is essential, and the support system needs to be both tall and strong.

Stake-&-Wire / Hanging-String Set-Up

Stakes & Wire. To set up a hanging-string trellis, start with tall, strong posts, driven into the ground every 20 feet, with a line of strong wire, such as 12-gauge high-tensile wire, stretched tightly, between the posts.

If wooden or steel T-posts are used, a hole can be drilled at the top of each post through which the wire can be threaded and secured. If you are a welder, you may be able to burn the holes more quickly through metal T-posts. Steel U-posts come predrilled, eliminating this step.

Hanging Strings. A length of twine is tied to the wire at every point where a vine will be suspended, and then loosely tied at the base of the plant with an overhand knot. Hanging strings made of biodegradable sisal trellis twine facilitate clean-up at the end of the plants' lifecycle.

It is important not to make the knot at the base of the plant too tight, because it will cut into the plant as it grows. You can use a tomato trellis clip to attach the string instead of a knot. Tomato trellis clips are designed to bite onto the string securely, but to gently encircle the vinestalk.

As the vines grow, they can be attached to the string with additional trellis clips, or they can be twisted around the string to support the plants. Just make sure you always twist in the same direction, or you will unwind the string you have already twisted!

This method is more labor intensive, but works better for pruned indeterminates, than the basket-weave method.

Vines on Rollerhooks in the Greenhouse
Hanging-String Trellising System in the Greenhouse
We trialed indeterminate Greenhouse Tomatoes (background) and Greenhouse Cucumbers (foreground) with this method. The vines climb up the twine, suspended from overhanging pipes via Rollerhooks or Tomahooks, which are shifted to lower & lean the plants as they grow and produce.

Lower & Lean Tutorial  »
Protected Culture. The hanging-string method as described above can be used in a hoophouse, but within protected-culture settings, it is more common to run pipes or wires above the crop rows, to which you can attach the hanging strings (see photo). This eliminates the need to pound posts inside your hoophouse, plus it allows for a taller trellis for the longer hoophouse season.

Another variation on the hanging-string method in a greenhouse or hoophouse is to use Tomahooks or Rollerhooks to attach the overhead strings. These are strong, and conveniently allow the vines to be lowered and leaned, since they may outgrow their vertical space in a greenhouse. With this method, a spool is attached at the overhead wire, and when the plants run out of growing space, you can play out some of the string, about a foot at a time, and move the plants one position to the side so the vines don't pool up at the bottom and break. The plants at the ends of rows go around to the other side. This requires plants to be planted in double rows, two feet apart being a common spacing.

Vertical Trellinet
Vertical Netting Trellis in the Greenhouse
We offer multiple types and sizes of mesh trellises, so you can order the exact dimensions you need to reduce waste, cost, labor — and trip hazards! Shown here is vertical Trellinet, which is very similar to Hortonova, but good for smaller-scale applications.

Hortonova Trellis Usage Comparison Chart  »
View All Trellis Netting  »

One variation on the hanging trellis system that can be set up either in the field or a protected culture setting uses trellis netting instead of hanging strings to support the vining crop.

Netting Trellis Set-Up

The first step of installation is just like the hanging-string method, where tall posts with holes at the top of them are pounded every 20'. With this method, as you are threading the heavy-gauge wire through the tops of the posts, you weave it through the mesh at the top of a piece of Hortonova.

As the plants grow up, they can be clipped to the Hortonova with trellis clips, or tucked into the square mesh, weaving them into the mesh.

We use this method on my farm for cherry tomatoes, because sometimes we like to let our cherry tomatoes develop more than two heads, and the mesh can accommodate any number of heads. This method also works well for crops like climbing beans or peas that don't have a discrete number of vines.

So whether you grow in the field, high tunnel, glasshouse, patio, backyard, hoophouse, or warehouse, give thought to what types of tomatoes you want to grow, consider the ergonomics involved and the resources you can apply, and choose the trellising option that best fits your needs. You will find you can customize the system to suit your preferences and the conditions at hand.

When your vining crops are provided appropriate trellising and support, your growing efforts will be more efficient and deliver optimal yields of premium fruit with fresher flavor.


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