It’s autumn and with the cooler temperatures some of the plants out in my pond are going to flower. The most striking one is a field of Pogostemon yatabeanus that I have out there.

This Asian native has grown wonderfully all summer for me

, but has started producing terminal flower spikes on most of the stems.

The spikes themselves are quite pubescent (hairy), and are made up of hundreds of individual flower buds.

Up close, the flower buds look more like an insect than a flower, but you can see that they gradually begin to open up, with each bud producing a viable flower.

The flowers themselves are a brilliant purple and very feathery. Each flower has a single stamen protruding outward.

The immature flower doesn’t appear to have pollen (below)

, but over a day or two each stamen is filled with it.

In this 5X magnification (below), you can see the tiny pollen particles clustered on the stamen. I’m not sure if a single flower spike can fertilize itself, or whether multiple plants are required.

Eventually, the individual flowers detach from the spike, with the wind carrying them away.

Below is a close-up of what’s left once a flower detaches.

Eventually, all that’s left is a bare terminal spike that looks similar to how it all started.

I really love seeing how our aquarium plants grow and flower outside of the aquarium. Submersed, Pogostemon yatabeanus has growth that’s similar to its terrestrial form, but it’s more delicate with narrower leaves.

By trimming more frequently, you can encourage the plant to produce smaller leaves, which is really necessary for most aquascapes. It also has a unique feature of sometimes sending out creeping runners that then popup new stems a few inches away. Overall, it’s a great aquarium plant, and it converts pretty easily from emersed form.

I was very happy to walk out to my raised brick pond this evening and find a single Nymphoides sp. ‘Taiwan’ flower. This particular Nymphoides species is fairly rare to flower, which is exactly why I put it outside for the summer.

Every summer I try to put a number of previously unidentified aquatic plants in the hobby outdoors in hope that they’ll flower for me so that more botanically inclined folks can use my photos and pressed specimens to properly identify them.

This particular flower is only about nickel sized in diameter, and sits about 2-3″ above the small lily pad below. It has four sepal and very delicate petals.

The plant itself is a very easy to grow plant indoors in your aquarium, or outside in the pond. Indoors, if you continually trim any of the leaves that reach toward the surface, it will eventually grow fully submerged. One of the neat things about Nymphoides sp. ‘Taiwan’ is that roots eventually grow from the underside of each lily pad, producing a fully viable plantlet. That makes propagation very easy, and possibly also explains why it rarely has cause to produce reproductive flowers.

Nevertheless, I’m very pleased that my plants cooperated and flowered! Now, I can feel justified to clear the water surface, as nearly the entire area is covered by overlapping Nymphoides sp. ‘Taiwan’ leaves! I’ll be sure to post soon if we’re able to properly identify this plant.

I was very excited this weekend to discover that a plant out in my pond was flowering! This particular plant was collected down in Texas in 2009, and a few of us have been growing it in our aquariums ever since, not knowing what its identity was.

We didn’t actually know we collected it until we got home, sorted through some other plants, and found a single stem in with everything else. In fact, I wasn’t even sure if it was an aquatic plant at first, but sure enough, it grew, albeit slowly. 

With the flower, we now believe the identity of this plant is likely Acmella americana, which has also been known as Spilanthes americana and Acmella oppositifolia over the years.

Submerged, Acmella americana grows a lot like Hyptis lorentzianai, except that it stays lime green in coloration. The growth rate and pattern is similar to Hyptis, in that the leaves stay much smaller under water, relative to their terrestrial size.

Additionally, emersed the stems tend to creep horizontally, but in the aquarium they are much more upright, with longer distance between the nodes. Due to that distance, use in aquascaping would require several stems growing together like you would grow purple bamboo or the true Rotala indica.

I’m very happy to finally get a lead on a plant ID after finding this plant 18 months ago. Now that we have a likely ID, I’m going to try to grow it out, and have some others try using it in their aquascapes to truly find out whether or not it’s a viable plant for the aquascaping hobby. Apparently, Acmella americana has been available in the pond hobby for some time, so it should be readily available to anyone looking to try it out. Comments welcome!

Over the past few years, a number of plants from the Syngonanthus genus have become quite popular in the hobby. One of these is Syngonanthus sp. “Madeira”, a beautiful green stem plant from the Eriocaulaceae family. S. sp. “Madeira” is a delicate plant in mass, but doesn’t seem to be terribly difficult to grow given the proper conditions.

Photo Credit: Jake Adams, editor of ReefBuilders.com

For me, the proper conditions seem to be medium to high light with CO2 and water-column fertilization. Without sufficient iron, this plant tends to appear more pale than when it is in prime health. One of the beautiful things about S. sp. ‘Madeira’ is the shear number of leafs that come out of its crown. Usually it takes a couple months for the plant to adjust to your aquarium, but once it does it’s a pretty faster grower, and bushes out readily after trimming.

I’ve also grown this plant in my emersed setup, throwing a bunch of stems in and allowing them to float on the surface. About a week later, a few of the plants sent up flower stalks!

When you see the flowers, it’s easy to understand how Syngonanthus is in the Eriocaulaceae family, as the flowers are hat-pin type, just like their cousins in the Eriocaulon genus. The flower stalks are slightly pubescent (hairy), with the bud being indented in the middle.

I’m hopeful that these flowers will help us identify the true species for this plant. It’s somewhat probable that several of the Syngonanthus variants being traded, such as Belem, Lago Grande, and Madeira are all actually the same species, but from different localities. Nevertheless, all of these are wonderful aquarium plants that I recommend trying.

One of the newer plants I’ve been growing was sold to me as Limnophila sp. ‘Wavy.’ It is a larger, bright green, version of the Limnophila aromatica whose leaves grow in slightly twisted and wavy. When handled out of water, L. sp. ‘Wavy’ has a smell similar to rosemary like L. aromatica. I would not be at all surprised if we learned that Wavy is really just a variant of L. aromatica.

I am currently growing Limnophila sp. ‘Wavy’ in my 75G aquarium to provide a bright green background to my hardscape. Since it is a slightly larger plant, it probably isn’t very well suited to any aquarium smaller than 40G-50G. So far, it has been an incredibly prolific grower, requiring a trim more frequently than L. aromatica, which is also growing in the same aquarium.

It accepts trimming well, and eventually branches at the spot of the cut. Therefore, if you have a larger aquarium, I would recommend this plant as an excellent addition to provide bright green coloration with a unique leaf shape.