|Topic Review (Newest First)|
|09-18-2015 08:40 PM|
Originally Posted by mattinmd View Post
Originally Posted by mattinmd
|09-18-2015 05:04 PM|
Understood... I was just trying to give a basic explanation that should be understandable to most and give the correct overall idea.
If you start digging into a biology text you'll get more into the specific reactions of photosynthesis, but that's a very "looking at the trees not the forest" perspective.
Pretty much all texts that cover photosynthesis either:
a) Get technically deep really fast into the specific mechanisms and reactions going on. Most biology/botany books or research papers do this.
b) Cover it at the same simplistic level I did above (light+water+co2 = sugar + O2), and move on to other topics. Most gardening books do this, right next to the one paragraph discussion of fertilizers. Elementary school science texts also cover it at a similar level.
Regardless, given the general concepts, you could easily grab a decent biology text book and get into the specifics of photosynthesis...
You could also dive into the relevant wikipedia articles:
Which breaks down into 2 sets of reactions, one set depending on light, the other not but directly coupled to the light dependent reactions.
|09-18-2015 04:43 PM|
|Mariostg||There is nothing wrong in needing a book to find out about that basic understanding though.|
|09-18-2015 04:38 PM|
You shouldn't need a book... Just a basic understanding of photosynthesis should tell you that light is useless to a plant without CO2 and H2O...
Photosynthesis uses energy from light to break down CO2 (or in some cases carbonate) and H2O, and re-bind the carbon and hydrogen together into sugars, and releases the oxygen. Thus this reaction can be limited by any of the three required materials.
In terrestrial plants, CO2 is never an issue as it is abundant in air, and generally lack of water causes other more major problems for a plant. Thus, terrestrial gardeners tend to view photosynthesis as entirely light driven, as it is the only practical limiting factor.
In aquatic plants, water is never an issue, but CO2 is poorly soluble in water, and is quite often a major limiting factor if there is sufficient light.
Also, consider that under low CO2 concentrations, the plant needs to use mechanisms that concentrate carbon, or extract carbon from carbonates. Both of these require more energy, thus you get less sugar produced per quantity of electrons hitting the plant.
|09-18-2015 04:02 PM|
Originally Posted by Hoppy View Post
|08-05-2015 02:18 AM|
I would agree there is quite a range of light tolerance on that list.. I've always taken it as "plants that someone managed to make work in low tech", and not strictly low light...
I've had good luck with rotala sp. green and rotala colorata in my 10 gallon tank at 38 PAR.. I've had bad luck with them in my main tank at 28 PAR, at least the ones my mollies didn't chew on end up growing weird.
There's a huge amount of variation in what people will call "low light" and "good growth" as Hoppy mentioned.. but there's also variation in the correct identification of plants which may be corrupting that list.
Was that HC really hemianthus callitrichoides, or did someone have a different plant like Hemianthus glomeratus and mistake the name? Or have Monte Carlo and fail to identify the difference (ok, monte carlo is newer than this list AFAIK, so maybe that isn't it).
In fact, it's really odd that HC, aka dwarf baby tears, is on that list, but HG, aka baby tears and a much less demanding plant, isn't...
|08-04-2015 10:39 PM|
Originally Posted by micheljq View Post
|08-04-2015 05:24 PM|
I think anubias could grow, slowly, with just the natural light in a house.
Egeria densa, is really, really undemanding, it did grow up like mad in my low light tank.
A lof of crypts are quite forgiving.
Ceratopteris thalictroides too, in my low light tank, was growing like mad and doing baby plants all the time, and it was rooted to the bottom, not even floating.
Maybe it was already told, i did not look at all the posts.
However i do have some issues with some plants in the list in post no. 258.
Bacopa caroliniana is not a low light plant, it will just grow leggy and ugly, if at all.
Bacopa monnieri too.
Hygrophila polysperma was struggling in my low light tank and i lost it.
Same for ludwigia repens, struggling, ugly, full of algae.
Rotala rotundifolia same as ludwigia repens in low light in my tank.
Cabomba caroliniana requires a minimum of light, hardly a low light plant, limnophila sessiflora would be better, less demanding, and the look very similar.
Hydrocotyle leucocephala, yes if floating but not floating in low light, it did die.
Riccia fluitans, floating yes, not floating i doubt it.
From my little experience for what it is worth. My low light tank was a 24" high one with one led fixture Beamswork third generation (121 - 0,2w leds 10000K). It did ran for 8 months.
Another issue maybe the perception some may think their low tech tank is low light while they effectively have medium or higher light.
|08-03-2015 06:27 PM|
|jblah||Thanks for making this list. Exactly what I was looking for.|
|07-13-2015 11:50 AM|
|GadgetGirl||Being as this is a low light plant list in the low tech forum, I don't think it would be that difficult, for an expert, that is. Presumably no one here would be using CO2.|
|07-03-2015 06:52 PM|
Originally Posted by todvan View Post
|07-03-2015 04:32 PM|
How about developing a list of plants in order of general light tolerance starting from the lowest?
All Java Fern
|06-09-2015 07:11 PM|
The list should be seen as an opinion, which is not necessarily correct. For example, HC- Hemianthus callitrichoides will not grow well at all without CO2 and with low light. And, many of the stem plants listed will grow, but will be a big disappointment, with low light and no CO2 or Excel.
When this list was started, and added to, people were judging light intensity solely by watts per gallon, without even a universal agreement on what watts per gallon meant low light. We have progressed considerably since then.
|06-09-2015 05:23 PM|
Is this list still considered a good directory of plants to grow in low/med light with no co2?
Originally Posted by James From Cali View Post
|05-24-2015 01:39 AM|
|Kt-Radi0||Very helpful. Thank you|
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