Cryptocoryne Cordata Var. Siamensis

Cryptocoryne Cordata Var. Siamensis ‘Rosanervig’ Submersed

Cryptocoryne Cordata Var. Siamensis ‘Rosanervig’ is a very rare yet controversial plant due to it’s white/pink veining that no one has been able to put a thumb on. We do know that the veining is due to a virus, however the veining seems to either be very pronounced or not pronounced at all depending upon the set up they are in.

I have seen this species under high light conditions (60+ PAR) with it’s veining still present and very deep, while also seeing this species in another set up with med/high light where hardly any veining is pronounced.

For me personally I have only been able to get deep/rich white/pink veining to display under lower light conditions like you’ll see with this runner hidden behind a piece of driftwood…

HOWEVER; I also have a runner in the front of my tank where the light is MUCH brighter (60+ PAR) and you can clearly see a pronounced pink/white vein, although it is not as “thick” as the one hidden behind the driftwood.

This is a new leaf forming off the mother plant, the mother unfortunately does not have the greatest veining but the plant is an absolute monster at almost 18+ inches tall and constantly sending 10-15 runners every 6-8 months.

Here are more runners, in total I have six runners currently popping up, all ranging in size from tiny plants just forming to daughters that have 2-3 leaves.

As always here are the specs the plant is kept in:

PH- 7.4 at night, 6.5 during the day when CO2 is on.
Temperature- 74-76
Lighting- 30″ Dual bulb T5HO – 6700k and Rosette bulb (10 hours per day). 24″ Dual bulb T5HO – 6700k and Rosette bulb (8 hours per day)
Filtration- Marineland C220 Canister Filter
Substrate- Flourite Dark, Flourite Red, Flourite Black Sand, Muriate of Potash, Dolomite, Mineralized Top Soil, and Natural red clay from the earth.
Water Changes- X 1 a week 50%
Dosing- Alternate Micro and Macro ( 1 day Micro, 1 Day Macro, etc) KNO3, KH2PO4, KS2O4, and Plantex CSM+B.
CO2 – Dual Stage Concoa 212 with Parker H3l, Fabco Solenoid, bubble counter and 15LB CO2 Tank. 2 BPS via inline diffuser on canister outlet line.

Cryptocoryne Cordata Var. Siamensis ‘Thailand Sungai Kolok CTSK’

There is little to no information on this Cryptocoryne anywhere on the internet; I can only trace it back to two people, one in which I know personally and is a great friend of mine; where the other one who originally brought this plant in hasn’t said much about it (at least from what I could find).

I just recently got this species on the weekend so it is still adapting to it’s new conditions and is quite small; however as it grows I will take lots of pictures.

Also, here is a link to my friend who posted a picture of the spathe when he had it blooming: Photo belongs to orchidnutz;Jim. R

http://www.aquaticplantcentral.com/forumapc/attachment.php?attachmentid=29186&d=1411536600

Right now I have it under the following conditions:

Lighting- Coralife T5NO Dual Bulb – 6700k and rosette bulb – Lights are on for 10 hours.
PH- 7.5
Substrate- Homemade substrate mix, cow manure, sheep manure, worm castings, natural red clay, and cheap topsoil.

Cryptocoryne Cordata Var. Siamensis ‘Blassii’

Cryptocoryne Cordata Var. Siamensis ‘Blassii’ is another plant that gave me trouble submersed, however in emersed conditions this plant grows extremely well and sends many daughter plants.

This is a great beginner Cryptocoryne that you don’t always see for sale; I originally got this species from Oriental Aquarium in Singapore.

In some pictures you can see the pink “shine” the plant has, it’s quite attractive.

Cryptocoryne Cordata Var. Siamensis ‘Rosanervig’ Emersed

In the past 6 months I’ve had my Cryptocoryne Cordata ‘Rosanervig’ send 8 runners which has allowed me to experiment with it’s growing conditions. Up to date I’ve kept this plant submersed in medium light with CO2, E.I dosing and a very nutrient rich substrate but because of the excess amount of plants I have I decided to try some emersed in low light.

Most of the plants are still adapting to emersed conditions but it’s interesting to see the different leaf formations/patterns all within one plant; it’s easy to see now how this plant can be mistaken for another if grown improperly. I personally do not have a large enough tank at the moment to keep this plant under it’s proper conditions which is why I have it under medium light & it isn’t displaying it’s veins.

From my previous research and experimentation with this plant I’ve found that keeping it light conditions under 20-30 PAR really bring out the veins, to increase the pink coloration I’ve found it to be a matter of increasing phosphates, contradictory to other experts advice.

Enjoy the pictures, and as you will see in them the Cryptocoryne Cordata ‘Rosanervig’ is truly a beautiful plant when it’s veins are displayed.

As you can see I have many to experiment with in emersed conditions 🙂

TorontoPlantMan
Kirk Gibson

Cryptocoryne Cordata Var. Siamensis ‘Rosanervig’

I was lucky enough to get this plant a little over a year ago from a well known hobbyist here in Canada. When I first got the plant it only had two small leaves on it and took roughly 4-5 months to adapt and start forming a new leaf. I unfortunately had to move a short while later so it never had a chance to fully get established, nor did it enjoy the water parameters it was in (very hard water PH 8.2+). After I moved the water parameters which much more favourable (PH 7.5) but with the addition of pressurized CO2 I’ve been able to bring the PH to a stable 6.5. This is where I’ve found the Cordata ‘Rosanervig’ is happiest and has sent 4 runners for me in the last 6 months and roughly 1 new leaf every two weeks/three weeks. It was not easy to figure out exactly what the Cordata Rosanervig preferred but with much patience and experimentation I believe I’ve found it’s ideal conditions.

I’ve done many experiments with substrates, lighting, water parameters, and fertilizing and this is what I’ve found.

1st attempt (FAILURE)
– PH 8.2 (Water was too hard)
– MGOCPS with silica sand cap (Anaerobic conditions formed and the plant was not happy)
– Tank was near a window (Plant does not enjoy high lighting)
– Excess lighting+nutrients caused algae to form and veins to disappear.

2nd attempt (SUCCESS)
-PH 6.5 (Nice and soft)
– MTS+Dolomite+Muriate of Potash+Natural Clay + Seachem Flourite Dark X 1, Red X 1, Black Sand X 2.
– E.I dosing, micro + macro nutrients
– Pressurized CO2 10PSI 4 BPS
– T5HO light with PAR between 20-30. LOW LIGHT IS NECESSARY FOR VEINS TO DISPLAY.