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can one control plant size by restricting root growth?

4253 Views 21 Replies 9 Participants Last post by  Bandit1200
Just wondering have anyone tried to restrict the roots of larger plants, (e.g. anazon sword) so that they become stunted/dwarf/smaller in size, kind of like the bonsai concept?
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Just wondering have anyone tried to restrict the roots of larger plants, (e.g. anazon sword) so that they become stunted/dwarf/smaller in size, kind of like the bonsai concept?
They won't experience the same degree of stunting as you can get with bonsai, but you can definitely keep them under control with root pruning and regular leaf trimming.

One of my first plants was a runner off a monster sword with leaves 18" long and a good 2 1/2" wide. It had three mature leaves about 6" long and two new leaves just coming in when I planted it in my tiny 10g. I trimmed 50% of the root mass and took off one of the mature leaves--then removed the other two once I had a couple new leaves showing to replace them a couple weeks later.

From then on, I would snip off any leaf that started getting too large for the space and root prune every three to four months. Between restricting it's ability to gather nutrients and forcing it to constantly put it's energy into growing new roots and leaves, the leaves that did grow never attained anywhere near their full potential--but it required regularly monthly care to maintain. My swords are now in fluorite instead of polished gravel so I can't uproot them to root prune, so instead I tease up some of the roots from all around the plant starting about an inch or so out from the base and prune from there.
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ok, thanks for the info.
This does not work with aquatic plants, they can meet their nutrition from the water column.

So basically you either limit the nutrients(sediment and or water column), or you do not, constricting the space will do little.

Bonsai trees have nowhere else to get nutrients. Aquatic plants do.
This does not work with aquatic plants, they can meet their nutrition from the water column.

So basically you either limit the nutrients(sediment and or water column), or you do not, constricting the space will do little.

Bonsai trees have nowhere else to get nutrients. Aquatic plants do.
Thanks. I was thinking that I can have an amazon sword that is small enough for my tank by restricting the root growth. Guess that will not work. Thanks tom.
They won't experience the same degree of stunting as you can get with bonsai, but you can definitely keep them under control with root pruning and regular leaf trimming.

One of my first plants was a runner off a monster sword with leaves 18" long and a good 2 1/2" wide. It had three mature leaves about 6" long and two new leaves just coming in when I planted it in my tiny 10g. I trimmed 50% of the root mass and took off one of the mature leaves--then removed the other two once I had a couple new leaves showing to replace them a couple weeks later.

From then on, I would snip off any leaf that started getting too large for the space and root prune every three to four months. Between restricting it's ability to gather nutrients and forcing it to constantly put it's energy into growing new roots and leaves, the leaves that did grow never attained anywhere near their full potential--but it required regularly monthly care to maintain. My swords are now in fluorite instead of polished gravel so I can't uproot them to root prune, so instead I tease up some of the roots from all around the plant starting about an inch or so out from the base and prune from there.
Well Tom it looks like you can control the growth to some extent. I have a have performed a similar method in one of my smaller tanks with good success. If you keep up with the old growth and the roots you can control the size of the pant. Tom have you even tried this method?
It's doable. We had some discussions on the subject in this thread I started a while back. Almost a year later, the plants in that thread are still <5".

Even though Tom is correct, there might be several other reasons for the large plants staying small: more effort goes into re-growing roots and/or the available space restriction.

I did a totally non-scientific experiment with a red tiger lotus:
  • Planted a tiny baby and way over-planted around it with HM, R. Indica, H. corymbosa and such. The red tiger lotus stayed <4" for about 6 months, apparently healthy and producing ~1-2 small stems a month.
  • Cleared the space around that lotus substantially. It pretty much exploded in size, with many leaves going for the surface. Kept it big for about 3 months.
  • Again over-planted around it, trimmed it down to 2-3 small leaves. It's now been back to <4" for the last 6 months.
I would LOVE to get more opinions and ideas on the subject.

That's the lotus in question (you can see the sword also) pic taken about 1 year ago. I'll take a pic what it looks like today for comparison. The sword grew a lot more leaves but is still ~5" in height.:

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OVT,
interesting thing you tried there. Your thread kicks up my hopes again to have an amazon sword in my smaller tank(20 gal) that I took down months ago. I am no bonsai expert so am trying to find out myself what are the conditions that would make a bonsai. I was thinking of using the planters to limit the space.

Would also like some input from bonsai ppl? hopefully someone will notice this......
OVT,
interesting thing you tried there. Your thread kicks up my hopes again to have an amazon sword in my smaller tank(20 gal) that I took down months ago. I am no bonsai expert so am trying to find out myself what are the conditions that would make a bonsai. I was thinking of using the planters to limit the space.

Would also like some input from bonsai ppl? hopefully someone will notice this......
Bonsai (yes, I've created and kept my own) works on the principle of limiting the tree's ability to gather nutrients by reducing leaf and root mass and strictly controlling the available soil content. A tree doesn't *start* in that tiny little pot, btw, it gets there gradually. And here's where a difference starts for aquatic plants. In a planted tank--especially one with fish and inverts--there's a constant influx of nutrients to the substrate as water circulates and debris accumulates. However, with rooted plants such as swords, the principal of root and leaf reduction still applies---forcing the plant to expend the majority of it's energy in growing new roots and leaves while restricting it's ability to gather nutrients (the former more than the latter).

Bonsai trees, even after they've been trained down to the small sized containers that most people associate them with, still receive periodic root pruning.

I've kept standard amazon swords in 20g ,10g, and even 2.5g tanks using this method to restrict their growth for years at a time.
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Bonsai (yes, I've created and kept my own) works on the principle of limiting the tree's ability to gather nutrients by reducing leaf and root mass and strictly controlling the available soil content. A tree doesn't *start* in that tiny little pot, btw, it gets there gradually. And here's where a difference starts for aquatic plants. In a planted tank--especially one with fish and inverts--there's a constant influx of nutrients to the substrate as water circulates and debris accumulates. However, with rooted plants such as swords, the principal of root and leaf reduction still applies---forcing the plant to expend the majority of it's energy in growing new roots and leaves while restricting it's ability to gather nutrients (the former more than the latter).

Bonsai trees, even after they've been trained down to the small sized containers that most people associate them with, still receive periodic root pruning.

I've kept standard amazon swords in 20g ,10g, and even 2.5g tanks using this method to restrict their growth for years at a time.
ok, now you got me really curious. Can you show me some pics of the amazon plant you speak of. You also mention the limitation of growth "to a certain degree". Do you mean both vertical and horizontal growth of just horizontal/vertical? It would be nice to have a scaled version of the actually big amazon, like a dwarf/small form. Not just in one dimension.
Well Tom it looks like you can control the growth to some extent. I have a have performed a similar method in one of my smaller tanks with good success. If you keep up with the old growth and the roots you can control the size of the pant. Tom have you even tried this method?
Yup, I have.

I have also cut off all the roots and the plant had the exact same rate of growth.

Academic support:

http://onlinelibrary.wiley.com/doi/10.1046/j.1365-2427.2002.00802.x/abstract

If you do not even have any roots.........well.......the size difference in the container is not going to matter.

But if you limit the overall nutrients in the water column, only then......can you get some effect.

You MUST limit both locations, not just one. So it could work if your water column is very very lean.

As Knotyourreality suggest, you can trim the outer leaves and keey the weed from getting too large, I'd suggest switching to crypts which are smaller and have the same similar shape.
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Should be pretty good article. I got to read it to be convinced. Thanks for the reference.
Isnt there a smaller variety of amazon swords? Or atleast swords in general?
Echinodorus tenellus is the smallest. :3
Ive kept dwarfed amzons in low light low tech ten gal. It grows pretty slow too.
Isnt there a smaller variety of amazon swords? Or atleast swords in general?
Parviflorus parviflorus 'Tropica' (Rosette Sword) seems to max at 8" x 8", usually wider then taller. A nice looking sword imho.
Parviflorus parviflorus 'Tropica' (Rosette Sword) seems to max at 8" x 8", usually wider then taller. A nice looking sword imho.
indeed a beautiful plant....
I have what sword that I bought as a "tropica" sword and the biggest it has ever got was about 2" high by about 2" wide. I have gotten about 6 plants from the first one I bought.
I have what sword that I bought as a "tropica" sword and the biggest it has ever got was about 2" high by about 2" wide. I have gotten about 6 plants from the first one I bought.
can you please let me know where you got it? if its only 2" it fits the bill of for my small sword.
I got it at a lfs about 3 1/2 years ago. When I get my new tank set up and get some new "pups" off of them I'll send u one or two
The OP was basically asking "will trimming the roots limit this plant" and several replies were "trimming the roots AND the leaves slowed it down" so this obviously means trimming the roots worked. That is a false statement. In order to prove that this is so, you can't introduce two different variables into the equation. You either trim the roots and compare OR trim the leaves and compare.

More than likely, it was either the combination of trimming top and bottom or just the fact that the leaves were continually cut back is what slowed the growth if that was the case.
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