EarthBox vs Grow Bag Challenge

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I like EarthBoxes, and I like grow bags. If you aren’t familiar with grow bags, they are basically cloth pots made from a durable fabric that is UV resistant. The advantage of a grow bag over a traditional pot is that the water drains out easily and the roots get lots of oxygen by breathing through the bag. I have found they work well with plants that don’t like too much water such as herbs. In my experience they work better for herbs than the EarthBoxes do, maybe I’ll do a comparison of that in the future.

For this challenge, I wanted to compare the growth of a pepper and tomato plant between the two. Before I get into the results, here’s how the grow bags were set up. I went through an EarthBox setup in the Aquaponics vs EarthBox post so I won’t repeat that.

Since the EarthBox is fixed in size, I wanted the grow bags to be similar in volume. EarthBoxes hold 2 cubic feet of potting mix which equates to about 15 gallons, since the EarthBox has two plants and each grow bag will only hold one I went with seven gallon grow bags (I’ve used this brand in the past and they have held up over the years). For the soil I used Miracle-Gro Raised Bed Soil since it is formulated for vegetables.

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each bag held just about a cubic foot of soil which was perfect.

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Now, just for fun I filled an extra bag with nothing but straight cow manure to see how a tomato plant would do in it.

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By the way, if you are using cow manure for any gardening don’t go for the cheap stuff, there is a difference. I’ll post some pictures in a future post proving it but one simple test will show you, put equal amounts of Black Kow and a cheaper brand in a pot or cup and spray down with water. The cheap brands are mostly un-composted wood fibers. Who would have thought that genuine cow poop would be so expensive.

Here’s a shot of the EarthBox and grow bags set up. I put them in an area where they would get equal amounts of sun. The grow bags are directly on the ground for this test and the EarthBoxes are raised up so they don’t get shadowed by the grow bags.

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I’ve been asked how to cut nice circles into the plastic EarthBox covers, here’s my solution. I use a can with a bolt attached as a handle and heat it up with a propane torch. It’s simple and easy and you can make a couple of different sizes.

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Next, I set up drip watering for each. The EarthBox gets a two gallon per hour dripper, each grow bag gets a one gallon per hour since they are half the size. The drippers run every morning for thirty minutes. I’d say the EarthBox has an advantage here as the water does not evaporate or drain out like it will with the grow bags.

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The last step is to put the plants in. For tomato plants I’m using home started Roma Tomatoes, for the pepper I’m using Lunchbox Orange from Bonnie Plants. I try to select plants that are the same size.

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Now for some results. Here are the tomatoes and peppers after one week, each shown side by side (EarthBox on left and grow bags on right):

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Tomatoes Week 1
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Peppers Week 1

Not much difference so far, the seedlings are just getting settled. Now for week two:

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Tomatoes Week 2
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Peppers Week 2

Boom. The EarthBox plants have taken off while the grow bags haven’t done much of anything. Week 3:

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Tomatoes Week 3
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Peppers Week 3

The EarthBox has once again reigned king. Now I know you may have noticed the yellowing leaves on the grow bag plants, this is most likely due to lack of water. For the next three weeks I have changed the drippers on the grow bags to two gallons per hour each, effectively doubling the amount they are getting now. That may or may not help since the bags are so porous. In the future I’m going to re-run this competition with some changes to the grow bag setups, details will be provided when that is started. I’ll post these plants again in three more weeks to see what has changed. Here is another view of the containers after three weeks:

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Oh and lets not forget about that extra plant, the one growing in the cow manure. how has it done? See for yourself:

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I’d say not so well, in fact it barely looks alive. I’ve upped the water on this one as well so maybe that will help, time will tell.

If you have any feedback or ideas for future comparisons I’d love to hear it! I do have a lot of things already planned but am always open to new ideas. One more thing, if you do any shopping on Amazon please consider clicking one of my affiliate links first, there is no cost to you and it helps support the site 🙂 A list of links can be found on this page, I try to update it with new products as they are shown and used on this site.

Over the past week I’ve been working on a filter for the aquaponic system and it is now in place, I’ll show the build process for that next week. Until then keep on planting!

 

4 Replies to “EarthBox vs Grow Bag Challenge”

  1. Did you fertilize both equally? I too have much better luck with Earthboxes vs raised bed for most plants. Tomatoes do better in the ground for me, though.

    1. I used similar fertilizer for both but the grow bags got less since they are half the dirt volume. I used 8 oz (1 cup) of 10-10-10 in the EarthBox and 2 oz of the same mixed in the grow bag soil. The EarthBox time releases better so the plan was to add more to the grow bag in a couple of months to simulate the same thing. I didn’t want to do too much at once to avoid burning the roots.

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