To expand on the techniques Julius mentions for growing aquatic aroids, here is how we grow seedlings of the cold-sensitive giant Victoria water lilies in a greenhouse in the winter to give them a head-start before planting them in the outdoor ponds when the weather warms up. I have great luck including my pots of Cyrtosperma, Montrichardia, Lasia, Lasiomorpha, Anubias, etc in these tanks during the winter.
We use a 10 foot diameter galvenized stock tanks used for watering cattle (they are about two feet deep, don't know exactly, and don't know how much water they hold) inside a greenhouse. To heat the water, we use a "backpack" style mini water heater normally intended for use in RV's/campers. An ordinary water pump made for pond waterfalls is connected to the heater via flexible tubing, and this pumps water from the tank into the water heater. The heated water is then routed back into the tank through PVC pipe, directing the water away from the intake pump in a direction that circulates the water all the way around the tank in a circular pattern back towards the pump.
With the volume of water in the above mentioned tank, it is not effective to wait until the water is cold before turning the water heater on, as it is unable to heat it up sufficiently in a relatively quick manner. This might be different if a smaller volume of water was used. A tank located in a sunny greenhouse will collect a lot of heat during the day that gradually gets released through the night, and therefore having the heater run continuously 24 hrs/day will do a great job at maintaining the warm water temperatures through the night. The heater we use has a built-in thermostat so it isn't constantly running, switching off during the warmer portions of the day. With this method, in an unheated greenhouse the water will be around 78 degrees Farenheight when it is below freezing outside. Of course there are a number of factors to consider - greenhouse size, sun exposure (heat build-up during the day), volume of water vs capacity of water heater, daytime high temperatures outside of greenhouse, supplemental ambient heating in greenhouse, etc. This is our experience in northern Florida where we regularly experience a number of nightly hard freezes each winter.
As an added benefit, this method can be used as supplemental heating for a smaller greenhouse, reducing the energy demands on traditional greenhouse heaters that are controlled by thermostats. Quite a bit of heat is released into the greenhouse through the night from the warm water. Supplemental heat may not be even necessary during mild cold snaps in a smaller greenhouse, depending on the ratio of water volume to the size of the greenhouse.
For anyone who wants to keep a large collection of tropical aquatic aroids and other plants, this is a good option for at least overwintering. This method could easily be adapted to a more natural looking in-ground greenhouse pond as well. In addition to the heat, the continuous water circulation surely benefits the plants. Though aquatic plants are often growing in seemingly anaerobic conditions in nature, stagnant conditions in artificial situations (pots) can be fatal to many aquatic plants.
Sent: Sep 27, 2009 9:42 AM
To: firstname.lastname@example.org, email@example.com, firstname.lastname@example.org
Subject: Re: [Aroid-l] ?? Water-loving Anthurium species
Date: Thu, 24 Sep 2009 12:18:51 -0600
Subject: Re: [Aroid-l] ?? Water-loving Anthurium species
Not sure if the list accepted a post from my other mail-server....a thousand pardons if this post is duplicated.
The images mentioned on the UBC website are mine, taken near El Guabal on the Caribbean versant of Veraguas Prov. Panama in late October 2007. According to an unpubl. (?) treatment of rheophytic anthuriums that Dr. Croat provided me some years back, A. rupicola is the lone member of Sect. Porphyrochitonium that survives his taxonomic revision of these puppies...all the other taxa mentioned are now considered to be Sect. Calomystrium. Having grown, wild-collected and propagated some of these spp. I happen to agree with this arrangement. Previously, all of these lance-leaf Anthurium spp. (incl. well-known ones such as amnicola and antioquiense) were also considered to be part of Sect. Porphyrochitonium and are treated as such by Kamemoto and Kuehnle in their '96 work on breeding ornamental anthuriums.
I have encountered the fully aquatic Spath mentioned both at the locality and in fast-flowing, boulder-strewn lowland streams flowing into the Caribbean in Omar Torrijos NP in Coclé. Plants are identical in general appearance to the rheophytic anthuriums being discussed, always deeply-rooted in gravel bottoms and always growing in less than 90 cm (3') of water, usually at depths less than 60 cm (2') near the edge. I remember that I found a name for this plant way back when, but Mr. Alzie eroding my memory...Dr. Croat will no doubt be able to provide a binomial for those interested.
I grow antioquiense, amnicola and rupicola. Easy but extremely sensitive to drying out between waterings (natch!).
I believe that a hort hybrid between antioquiense and amnicola that was developed years back at U Hawaii is (was?) circulating in SoFlo as true antioquiense...they tend to exhibit the lilac background color of the amnicola parent, the greater size and vigor of antioquiense, but are not noticeably fragrant at anthesis.
As has been mentioned elsewhere, my observations in seasonally-flooded areas of upper Amazonia coincide with others...that PLENTY of terrestrial plants (including some Anthurium spp.) spend many months with there roots and lower stems fully submerged and are clear candidates for culture in (large) paludariums. Beyond this, I did collect an apparently undescr. cordate-leaf sp. of anthurium in eastern Perú that was rooted smack in the middle of a permanent stream. Seed from this taxon was distributed to some people on this forum in 2001 and it is my understanding that Lynn Hannon donated her collection of these plants to MOBOT prior to her passing, so it may persist in culture at that BG. I still keep a few here for laughs.
> From: email@example.com
> To: firstname.lastname@example.org
> Date: Mon, 21 Sep 2009 21:02:59 -0400
> Subject: [Aroid-l] ?? Water-loving Anthurium species
> Hi All,
> I recently ran into a thread on the UBC Botanical Garden Forums which mentioned several terrestrial Anthurium species that occur in
> very wet situations in nature, including river banks and streamside rocks. The roots of these anthuriums might grow right in the water
> or in very wet media for extended periods or permanently. I am on the hunt for Anthurium that grow well in saturated soils and wonder
> if anybody can help me to source some of these plants(?).
> Here are some of the species mentioned in those forum posts:
> A. amnicola
> A. antiquiense
> A. riparium
> A. rivularis
> A. rupicola
> A. sagittatum
> A. werfii
> Is there a technical terms to describe plants that grow on rocks with their roots in the water? There are a number of aquarium plants
> that use such habitats.
> Thanks for considering this. I really would like to hear any ideas for sources that might come to mind. Incidentally, a post in that same
> thread also mentioned that "both amnicola and rupicola grow in sympatry with a fully aquatic Spathiphyllum sp.". I have never heard of
> any fully-aquatic Spathiphyllum, and I would really like to know more about that too.
> Thanks very much!
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