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Friday, May 6, 2011

Upside Down Tomatoes

Yes, you can grow tomatoes upside down. Based on the claims in the large number of newspaper, magazine, and television ads, you'd think it is the best way to grow tomatoes. I conducted a test last year using methods as scientifically consistent as I could manage. The results ran counter to the advertising claims.

The concept of growing tomatoes upside down is interesting and intriguing. You put a plant in the bottom of a hanging bag, fill the bag with soil, water it, and you have an abundance of disease-free and pest-free tomatoes. Wanting to see if it really worked, I tried it.

An upside down tomato plant

Using two tomato hanging bags, I planted a "Better Boy" tomato plant in one and a "Sweet 100" tomato plant in the other. I also planted the same two varieties, purchased from the same tray in the same store, in a raised bed. The primary difference in the beginning was that the hanging bags were filled with a name brand potting soil that contained some balanced fertilizer, while the raised bed was filled with soil amended with compost and no fertilizer.

The hanging bags after planting

All of the plants were located relatively close to each other and received the same amount of sun and other weather. I watered the plants regularly and similarly. The hanging plants did receive more water because the water tended to drain out faster and the bags dried out sooner.

It was noticeable right away that the hanging plants grew faster, but not bigger than the ones in the raised bed. By the end of the season, the plants in the ground were bigger, bushier, stronger, and bore more fruit.

The hanging plants flowered and set fruit, but in dramatically smaller numbers. For the "Sweet 100" plants (a cherry tomato) I harvested nine tomatoes from the hanging plant and more than sixty from the plant in the ground (there were many more unripe tomatoes on that vine when the first frost hit). For the "Better Boy" plants I harvested four tomatoes from the hanging plant and more than 20 from the plant in ground (it too had many more unripe fruits that were affected by the frost).

Mid-season growth; other tomatoes are on the right

The obvious conclusion is that tomato plants in a raised bed will produce much more fruit than ones grown upside down in a bag. I didn't notice any difference in taste.

To be fair to the makers of the upside down growing system, they don't directly compare their promised results to traditional garden beds. They do say that you can expect bigger and better fruit, but that is a bit vague. They are marketing to people who don't have desire, time, or space to grow in the ground.

Topsy Turvy, the one you see advertised so much, guarantees 50 pounds of tomatoes from their Tomato Tree set that holds multiple plants. That averages out to a little more than 12 pounds of tomatoes per plant, not a lot. If you look closely at their advertising photos you can see that the individual plants only have a dozen or so tomatoes on them when fully grown. I'm used to more than that on my garden plants.

Online reviews from many of the customers of these systems seem to show similar results to those I had. If you plant upside down and expect abundant fruit, you'll probably be disappointed. However if you plant upside down on a deck or patio because you don't have garden beds, then it gives you the chance for tomatoes that you wouldn't have otherwise.

I've tried to analyze the results and have a few conclusions. Though the claims are that the system uses gravity to draw nutrients into the vine and fruit and make them bigger and better while it allows roots to grow up, this is counter to the natural way plants grow. The tomato vines in my upside down planter were still trying to grow "up", using extra energy and distorting the vine, while the roots also tended to grow "down" and not expanding well within the container; this led to fewer flowers and less fruit.

The weight of the fruit put them low while the vines grew up. The foliage was thin and didn't shade it normally. This exposed the fruit to more direct sun and some of them developed sunscald. Sunscald is a white or yellow area on the fruit and can render it inedible. Though growing upside down is supposed to shade the fruit with the additional mass of the growing container, I didn't find that to be the case. The plants in the ground shaded the fruit well.

Exposed fruit

While the hanging tomatoes did have better exposure to air flow and should consequently have fewer fungus and disease issues, there is less heat to blanket the plant. This makes a difference in a region like mine when the nights start to cool off early. Plants in the ground can use the heat of the soil to help moderate night temperatures. Hanging plants cool off faster and late fruit and flowers are less likely to develop in cool conditions. You should expect fruit later into the season with plants in the ground.

Plants in the ground are obviously bigger

The bigger mass of the plants in the raised bed raised the overall temperatures near the plants and that may have helped produce more flowers. I also saw more bee and fly activity near these plants than in the hanging containers. That may also help explain why more fruit developed in the bed.

It was an interesting experiment. I can recommend upside down growing only to gardeners who have no other options. Based on previous experience, I suspect that tomatoes grown in a large pot will grow better than in an upside down bag. If given the choice, plant and grow tomatoes in a raised bed with amended soil. Sure, you may have to stake and tie the vines to keep them from sprawling on the ground (one of Topsy Turvy's negative claims), but that gives you the opportunity to help your tomatoes grow best.
Yes, you can grow tomatoes upside down. Based on the claims in the large number of newspaper, magazine, and television ads, you'd think it is the best way to grow tomatoes. I conducted a test last year using methods as scientifically consistent as I could manage. The results ran counter to the advertising claims.

The concept of growing tomatoes upside down is interesting and intriguing. You put a plant in the bottom of a hanging bag, fill the bag with soil, water it, and you have an abundance of disease-free and pest-free tomatoes. Wanting to see if it really worked, I tried it.

An upside down tomato plant

Using two tomato hanging bags, I planted a "Better Boy" tomato plant in one and a "Sweet 100" tomato plant in the other. I also planted the same two varieties, purchased from the same tray in the same store, in a raised bed. The primary difference in the beginning was that the hanging bags were filled with a name brand potting soil that contained some balanced fertilizer, while the raised bed was filled with soil amended with compost and no fertilizer.

The hanging bags after planting

All of the plants were located relatively close to each other and received the same amount of sun and other weather. I watered the plants regularly and similarly. The hanging plants did receive more water because the water tended to drain out faster and the bags dried out sooner.

It was noticeable right away that the hanging plants grew faster, but not bigger than the ones in the raised bed. By the end of the season, the plants in the ground were bigger, bushier, stronger, and bore more fruit.

The hanging plants flowered and set fruit, but in dramatically smaller numbers. For the "Sweet 100" plants (a cherry tomato) I harvested nine tomatoes from the hanging plant and more than sixty from the plant in the ground (there were many more unripe tomatoes on that vine when the first frost hit). For the "Better Boy" plants I harvested four tomatoes from the hanging plant and more than 20 from the plant in ground (it too had many more unripe fruits that were affected by the frost).

Mid-season growth; other tomatoes are on the right

The obvious conclusion is that tomato plants in a raised bed will produce much more fruit than ones grown upside down in a bag. I didn't notice any difference in taste.

To be fair to the makers of the upside down growing system, they don't directly compare their promised results to traditional garden beds. They do say that you can expect bigger and better fruit, but that is a bit vague. They are marketing to people who don't have desire, time, or space to grow in the ground.

Topsy Turvy, the one you see advertised so much, guarantees 50 pounds of tomatoes from their Tomato Tree set that holds multiple plants. That averages out to a little more than 12 pounds of tomatoes per plant, not a lot. If you look closely at their advertising photos you can see that the individual plants only have a dozen or so tomatoes on them when fully grown. I'm used to more than that on my garden plants.

Online reviews from many of the customers of these systems seem to show similar results to those I had. If you plant upside down and expect abundant fruit, you'll probably be disappointed. However if you plant upside down on a deck or patio because you don't have garden beds, then it gives you the chance for tomatoes that you wouldn't have otherwise.

I've tried to analyze the results and have a few conclusions. Though the claims are that the system uses gravity to draw nutrients into the vine and fruit and make them bigger and better while it allows roots to grow up, this is counter to the natural way plants grow. The tomato vines in my upside down planter were still trying to grow "up", using extra energy and distorting the vine, while the roots also tended to grow "down" and not expanding well within the container; this led to fewer flowers and less fruit.

The weight of the fruit put them low while the vines grew up. The foliage was thin and didn't shade it normally. This exposed the fruit to more direct sun and some of them developed sunscald. Sunscald is a white or yellow area on the fruit and can render it inedible. Though growing upside down is supposed to shade the fruit with the additional mass of the growing container, I didn't find that to be the case. The plants in the ground shaded the fruit well.

Exposed fruit

While the hanging tomatoes did have better exposure to air flow and should consequently have fewer fungus and disease issues, there is less heat to blanket the plant. This makes a difference in a region like mine when the nights start to cool off early. Plants in the ground can use the heat of the soil to help moderate night temperatures. Hanging plants cool off faster and late fruit and flowers are less likely to develop in cool conditions. You should expect fruit later into the season with plants in the ground.

Plants in the ground are obviously bigger

The bigger mass of the plants in the raised bed raised the overall temperatures near the plants and that may have helped produce more flowers. I also saw more bee and fly activity near these plants than in the hanging containers. That may also help explain why more fruit developed in the bed.

It was an interesting experiment. I can recommend upside down growing only to gardeners who have no other options. Based on previous experience, I suspect that tomatoes grown in a large pot will grow better than in an upside down bag. If given the choice, plant and grow tomatoes in a raised bed with amended soil. Sure, you may have to stake and tie the vines to keep them from sprawling on the ground (one of Topsy Turvy's negative claims), but that gives you the opportunity to help your tomatoes grow best.

2 comments:

  1. Very interesting! Thanks for posting. I'm in GA where the "soil" is pretty much rocks and clay. I'm just renting and my landlord isn't too keen on me plowing up the yard (and frankly, after digging holes for a couple of rosebushes, I'm not too keen on digging in this mess any more!) so I decided to give container gardening a try. I have watermelons, cantaloupes, pumpkins, peppers, carrots, cucumbers, strawberries, blueberries, and tomatoes planted in various sized pots and containers. I decided to give the blueberries a try in a HUGE pot so I can easily take them with me when my lease is up. If I stay here another year, I'll probably go ahead and put them in the ground. So far, the strawberries (in hanging pots) are doing great but my children have a tendency to grab one just as soon as it turns red so I doubt there will be a real "harvest" there. Our first peppers are just about ready to pick and pretty much everything else has sprouted but how well it all does remains to be seen. I got a little bit of a late start on planting and it's already over 100 degrees here so keeping on top of watering the containers is already quite a chore! I hadn't originally planted tomatoes because my kids have planted those at Grandma's house and we don't eat a lot of them but my 4 year old decided today that we HAD to have tomatoes in our "garden" so I picked up a seedling and put it in an upside-down pot someone had given me (not the topsy-turvy...just a regular pot with a big hole in the bottom). The seedling was a little big and kind of took a beating getting through that hole and into the pot and I found out later that the variety I chose really needs a bigger container or to be planted in the ground so I'm pretty sure that will be a disaster but if it produces even one good fruit, hopefully the little ones will be happy and I'll definitely keep this review in mind for next year! If nothing else, I can blame my miserable tomato failure on the fact that upside-down really isn't the best way to grow tomatoes!

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  2. That sounds like an amazing garden in pots. If given the choice between upside down tomatoes and tomatoes in pots, I would definitely recommend the pots.

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