Our first garden was a container garden on a balcony. We had no soil, so container gardening was the way to go for us. It is fun to grow a container garden on a balcony, patio, driveway or in a greenhouse. Containers allow us to grow food without owning a spec of land. Containers are also great for indoor gardening. You can grow your own salad greens year round, or early carrots and even tomatoes.
Container gardening also presents some challenges. There are things that are true for any container garden, and there are things that are unique to grow bags. If you have the choice to grow in good soil, it is always better than any container. But if you need or want to grow in a container, a grow bag is a great option.
Why grow in grow bags
Grow bags are made of breathable fabric which means superior drainage and aeration. It is the aeration that makes them superior to other garden containers. If a container has no aeration and the roots reach the walls of the container, they give a signal to the plant to make more roots, resulting in a root bound plant. Eventually the plant just kills itself with a mass of roots going round and round in the container. Here is an end of season comparison picture. Both plants are done with growing, but one is completely dead.
Root bounding will not happen in a grow bag. Here if a root reaches the wall of the bag, it will be “burned” off, causing the plant to constantly produce new and healthy branching roots. This is also called air-pruning. This picture shows nicely how the roots did reach the wall of the bag, but did not go round at all.
Soil for grow bags
Soil is the heart of any container gardening. In the grow bags we use Mel’s Mix from the All New Square Foot Gardening
We also mulch our grow bags with wood chips just like the garden. It helps to keep the soil moist on top and we find that plants just grow better with mulch even in containers.
You can reuse this soil mixture year after year. Remove the wood chips mulch, empty all the bags, add about 10-20% new compost, and mixing it well up again.
Watering grow bags
Watering is always a challenge in container gardening. To much makes the plants sit in water, too little makes them dry out. It also depends on what the container is made of. Grow bags do dry out much faster than pots. The drainage and aeration of the grow bag leads to more frequent watering needs. Also it is difficult to really soak a grow bag, the water will come right out. Two things can be helpful.
Drip system
Install a drip system, so the grow bags get a constant moisture supply. We tried the bottle drip system. It did not do so well for us, even though many have great success with it. A pipe drip system would work well, too.
Self watering system
Have a container underneath the grow bag that you can fill with water so it can be wicked up. Any container would work, we got the idea from the Kiddie pool grow system. But if the container is too deep, you will need an overflow. You want most of the roots to be in air.
Here a build box out of styrofoam, it is not very deep, so an overflow is not needed. It looks like a raised bed. In this we planted cucumbers. Cucumber like water a lot.
Same idea, but boxes build out of wood and covered with plastic.
Fertilizing grow bags
Since containers do not contain much soil, heavy feeder plants need to be fertilized. Personally we prefer natural fertilizers. Bone Meal,
Hope we could encourage you to grow a container garden using grow bags.
Read also how to sew a grow bag, or order your Grow Bags ready made for you.
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Anna, this is all such great information. I would love to have such a great garden with healthy plants. I was not aware that root bounding would not happen in a grow bag. That is good to know.
You are welcome Shirley. I am sure your flower garden does look great. Keep on growing!
These are so cool! They would really cut down on storage space for my pots I grow in. I’ve never seen things like this. Very good idea.
Try it Amanda, and let me know how you like it. Did you see my post on how to sew the grow bags?
I’m still very intrigued by these “grow bags”. How long do they last?
It depends what you make them out. Our fabric has at least 20 years guarantee, however, the bags will not last that long, since there is a bigger wear and tear.
I’ve done mostly container gardening and I never have good success with tomatoes. This year I’m planting them in the soil. I didn’t know that plants would not get root bound in the growing containers. Good to know.
Great tutorial. Thanks for all the great information. I can’t wait to try grow bags this year.
~Lisa
What do you use to prevent mosquitoes or rotten water caused when the fertilizer drains thru the potting soil. Also do you allow the water to completely evaporate before refilling? Thanks. giving it a try, but unsure about leaving standing water around during the summer.
Yes, we do let it dry between watering, this way we prevent mosquitoes or rotten water.
What is the best way to clean these bags in between uses
I do not know, truth is we don’t clean them, just reuse as is. I have thought about cleaning them, but the minerals that accumulate on them are just so firm, so I left them as is. If you find a good way, please come and share with us.
I think that hydroponic system cleansers will be ok to remove mineral salts buildups, who can affect the ph of the medium hence disturbing the nutrients uptake. Just soak bags in solution overnight and then rince.
Happy Gardening
Great tip, thank you for sharing.
Wash immediately after use. Then allow it to dry in the sun properly. However, if you are using the same soil type for growing, I don’t see the need to wash it except for the presence of unwanted organisms in the soil.
I received a felt grow bag as a gift and want to give it a try. I’m in Napa, Ca and can grow just about anything in our climate. I primarily grow vegetables. Do you have any recommendations on veggies that particularly like grow bags? My searches tend to bring up info on planting in soil bags! Thanks for the info!!
We grow mostly tomatoes in grow bags (determinate varieties), and they do very well. Since you are in a hot climate, you have to make sure you plant something that can handle the heat, since in a container (even in a grow bag) it will get even warmer.
From your experience, What size should I use for tomato plants? Say beef tomatoes or big boy.
We grew tomatoes in one squire foot bags and it worked great. However you will have to fertilize the plants.
How do you store the soil for the winter so that it doesn’t mold?
We just make a pile outside and let it sit till spring. In spring we ad compost, mix well and reuse.
how long can you allow plants (ornamentals) to stay in the grow bag?? (Notes above indicated long life– am assuming that is with use.) I used burlap ,– the material disintegrated after the first season. I had them inside the regular decorative clay pots.
Hi Cheryl, first to have a grow bag inside a regular pot misses the purpose of a grow bag. Not sure if that is the reason it did not last. We used our hand made for several years, some are still good. Still, there is no way for us to tell how long a bag will last for you, sorry. Hope you find a better solution for your plant.
Is the soil ratio by weight or volume?
It is by volume. Note also that peat moss will expend greatly once it is opened. If you can get the book, your library might have it, it explains it very well.