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Article #78: Prune and Trellis Your Tomato Plants to Achieve Higher Yields

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For many home gardeners, the tomato crop cage with twine.
is often a source of pride. Gardeners Tomato plants are susceptible to a number
often compete to see who can grow the of diseases that readily spread in humid
earliest ripe fruit, the biggest or most conditions. You can help your plants
flavorful tomato. The desire for perfect avoid disease, thereby increasing your
tomatoes sends many gardeners to their crop, by giving your plants plenty of
local garden centers in search of the room and allowing for adequate airflow in
latest potions or products that promise and amongst the plants. Keeping them
to help them achieve their goals. trellised so they're not sprawling on the
A simple way to ensure a larger number of ground will help, but you may also want
picture-perfect tomatoes is to keep the to do a bit of pruning on the plants too.
fruit and foliage up off the ground. Keep in mind that only indeterminate
Tomato plants are susceptible to fungal tomato varieties should be pruned.
diseases that are transmitted when As your tomato plants grow, you'll notice
infected soil splashes up onto the that they send out new shoots above every
foliage during a rainfall. The fruit is leaf stem where it attaches to the main
more susceptible to slug and insect stem. These new shoots are called
damage or rot if it is allowed to rest on suckers, and each sucker is capable of
or near the ground. This problem can be growing into another stem on the plant
easily remedied by trellising your tomato and setting its own blossoms and fruit.
plants to keep them up off the ground. Eventually the suckers will even grow
You can either purchase a ready-made their own suckers, making for a very full
tomato trellis or cage, or you can make plant.
your own. Ready made tomato cages can be The first suckers that appear will be
purchased at garden centers, from very low on the plant, generally from
gardening catalogs and sometimes at above the first sets of true leaves.
hardware stores. Styles vary, but the Since they are so low on the plant, the
most common tomato cages are made of fruit produced on these suckers will hang
heavy wire and are either round, square low to the ground and will be the most
or triangular. I have found that the susceptible to slug damage or rot from
round cages are often too small to contact with the soil. These first
support a mature tomato plant that is tomatoes are also the most likely to
loaded with heavy fruit. I prefer the suffer from cat facing which is a type of
square or triangular cages because they scarring found on tomatoes that have
can be folded flat for storage over formed while temperatures are cooler than
winter, they tend to be roomy enough for tomatoes like.
large plants, and two cages can be linked Remove those first suckers that appear by
together to support one very large plant pinching them off with your fingers
or two plants together. before they get more than an inch or two
You can easily make your own tomato cages long. If the suckers have grown longer
with materials found at any hardware before you can remove them, they can
store. Woven or welded wire fencing makes still be snapped off by hand, or you can
great tomato cages. Choose fencing that use your favorite garden shears to snip
has gaps between the wires large enough them off. Be sure to disinfect your
to reach through to pick your tomatoes. garden shears before moving on to another
Use a wire cutter to cut the fencing to a plant, to avoid spreading any diseases
length of about six feet, bend it into a amongst your plants.
tube shape and use a pliers to bend the Removing the first suckers on your plants
horizontal wires on one end around the will encourage the plant to send out even
vertical wires on the other end so the more suckers. You'll want to leave most
cage holds its shape. of these suckers on the plants so they
Square or triangular cages can also be can produce more tomatoes for you. But if
built with lumber. Start with four your plants are becoming full to the
upright pieces, roughly three feet high. point where you cannot see through to the
Nail crosspieces on the outside of the center of the plant, you may want to
upright boards on all sides, one set all remove a few suckers to promote better
around the top and attach another set air circulation throughout the plant.
about 18 inches below the top boards to Your tomato plants can expend their
make a 4-sided enclosure with two rungs energy making lots of smaller tomatoes,
on each side. but if they are limited to producing
If you're growing a large number of fewer tomatoes, those tomatoes will
tomato plants in rows, you may wish to generally be larger.
create a large-scale trellising system, As the growing season nears its end, your
much like what is used to support berry tomato plants will still be setting
canes. You'll need some heavy gauge wire blossoms and growing fruit. But the fruit
and metal fence posts, often referred to that is setting near the end of the
as T-posts. These can be purchased from season won't have time to ripen before
farm supply stores. At both ends of the the first killing frost. Four weeks
row of plants, sink two posts into the before the first frost date for your area
ground, placing the posts about two feet you can start pinching off any new
apart, one on either side of your plants. suckers and blossom sets that appear on
Then attach the wire at two or three your plants. Any fruit they may have
levels between the posts. As your tomato produced wouldn't have time to ripen
plants grow, they will be supported by before being killed by frost. This will
the wires. If you have a particularly allow your plants to put more of their
long row of tomato plants, you will want energy into growing and ripening their
to add more posts along the length of the existing fruit, rather than spending that
row so the wire doesn't sag under the energy on making more vegetative growth
weight of the heavy plants. and blossoms that will never get a chance
To avoid damaging the plants, it is best to develop into ripe fruit.
to place your tomato cages or trellis In addition to pruning and trellising
around the plants while they are still your tomato plants, always apply a layer
small. As the plants grow taller, you may of mulch beneath the plants in early
have to help them support themselves by summer after the soil has warmed. The
gently moving their large branches in mulch will help hold moisture in the
position over the wires or crosspieces of soil, discourage slugs and keep soil from
their cages. Particularly unruly plants splashing up onto your plants.
can be loosely tied to the trellis or






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