Random Aquatic Plant Generator

What the aquatic plant generator does

You want an aquatic plant. For an aquarium, a pond, a drawing, a study, or simply to learn what a Water Soldier or a Pickerelweed is.

This gives you one. A batch ranges from the famous water lily and lotus to aquarium staples like Java Fern and Anacharis, and floating oddities like Duckweed and Frogbit.

What waits in this list is a fact about these plants that most people never consider. They are not some separate ancient category of water plant. They are, almost all of them, ordinary land plants that returned to the water, and the strange things about how they live are all consequences of that homecoming.

How to use it

1. Choose how many you want. One for a subject, a handful to browse.
2. Press Generate. A fresh set every time.
3. Press Copy to take the set with you.

These plants left the water, then went back

Here is a piece of deep history that reframes every plant on this list. Life began in the water. Plants first evolved in the sea, then, in one of the great events in the history of life, they made the difficult move onto dry land, evolving all the equipment needed to survive out of water, roots to draw up moisture, stiff stems to stand against gravity, waxy surfaces to stop drying out, and systems to reproduce in air. Land plants are the triumphant result of that long conquest of the land.

And then some of them turned around and went back into the water.

That is what almost every plant on this list actually is. They are not primitive holdovers from before plants left the sea. They are the descendants of fully evolved land plants, flowering plants complete with all the land-going equipment, that returned to living in water, secondarily, much later. It is the botanical equivalent of the whales and dolphins, mammals that evolved on land and then went back to the sea, and it is just as remarkable. These are land plants that changed their minds.

Once you know that, the oddities of aquatic plants start to make sense as the marks of that return journey. A water lily still holds its flower up above the surface into the air, because its ancestors reproduced in air and it still does, sending its bloom back up into the world its family came from. Many aquatic plants still have proper roots and stems they no longer strictly need for support, inherited from land-dwelling ancestors. And some, having gone back, have shed or reduced the equipment they no longer need, roots that barely anchor, stems that no longer need to be stiff because the water holds them up. This list is not a catalogue of ancient sea plants. It is a catalogue of land plants in various stages of readapting to the water, carrying the evidence of their terrestrial past even as they thrive beneath the surface.

Four ways to be a plant that lives in water

Living in water solves some problems, there is no risk of drying out, and creates new ones, chiefly how to reach light and air while submerged. The plants on this list have arrived at a few distinct solutions, and sorting them into these groups makes the whole list easier to understand and to use.

Floating on the surface. The simplest solution is to float freely on top of the water, roots dangling into it or barely present, taking light and air directly from above. Duckweed, Water Hyacinth, Water Lettuce and Frogbit on this list are free-floaters, drifting on the surface with the whole plant riding the top of the water. This works beautifully for grabbing light and air, which is exactly why some of these floaters grow so aggressively that they can blanket a whole pond.

Rooted, with leaves on the surface. A second solution is to anchor in the mud at the bottom but send leaves and flowers up to float on the surface, bridging bottom and top. The water lily and lotus are the classic examples, rooted deep in the sediment but with those famous round leaves and blooms floating on or rising above the surface. This lets the plant anchor securely while still reaching the light and air at the top, a foot in both worlds.

Fully submerged underwater. A third solution is to live entirely beneath the surface, the whole plant underwater, taking in dissolved gases and light through the water itself. Many aquarium plants on this list, Anacharis, Hornwort, Vallisneria, Java Fern and others, are these submerged growers, living wholly underwater. They tend to have soft, often finely divided or ribbon-like leaves, because underwater a plant does not need stiff structure, the water supports it, and thin leaves maximise contact with the water around them.

Emerging from the shallows. A fourth group, the emergent plants, root in shallow water or wet mud at the edges but grow up out of the water into the air, standing partly submerged and partly aloft. Cattails, Pickerelweed, Water Iris and Arrowhead on this list are emergent plants of the margins, their roots in the water but their stems and leaves rising into the air. These are the plants of pond edges and marshes, forming the fringe between open water and dry land.

Nearly every plant on this list fits one of these four ways of living, floating, rooted with floating leaves, fully submerged, or emergent from the shallows. Knowing which one a plant uses tells you immediately where it lives in a body of water and how it grows, and for anyone planning an aquarium or pond, it tells you exactly where the plant belongs, drifting on top, rooted in the depths, or standing at the margin.

The deadliest plant in this list is hiding in it

This part is a genuine safety warning, not a curiosity, because this list of largely harmless and beautiful water plants contains, sitting quietly among them, one of the most poisonous plants in the entire world. Near the end of the list is Water Hemlock, and it deserves real caution and respect.

Water Hemlock is often described as one of the most toxic plants native to North America, and it is genuinely deadly. It contains a violent poison that attacks the nervous system, and eating even a small amount can kill a person, causing severe convulsions and death, sometimes with terrible speed. This is not a plant that makes you mildly unwell. It is a plant that can kill quickly and horribly, and it has done so to people and to livestock who mistook it for something harmless.

And that mistaking is exactly the danger, because Water Hemlock has an innocent, even appetising appearance and grows in the same wet places as edible plants. It belongs to the same broad plant family as the carrot, parsley and celery, and it can look deceptively like edible members of that family, with roots that have reportedly been mistaken for edible ones by foragers, with fatal results. It grows in the wet ground, marshes and stream edges where someone gathering wild plants might well be looking. The combination of extreme toxicity and a deceptively ordinary, edible-seeming appearance is precisely what makes it so dangerous.

The lesson is the same one that governs wild mushrooms and wild plants generally, and it is worth stating plainly. Never eat any wild plant gathered from around water, or anywhere else, unless its identity is confirmed beyond doubt by genuine expertise, because deadly plants like Water Hemlock grow among the harmless ones and can closely resemble edible species. This page is emphatically not a foraging guide, and the presence of Water Hemlock on a list otherwise full of pretty pond plants is a perfect illustration of why casual foraging is so hazardous, the deadliest thing here looks much like the rest. Admire aquatic plants, grow them, study them, but never assume a water plant is safe to eat, because one of the ones on this very list is among the deadliest there is.

Where these come from

The plants here come from a list our team put together and checked by hand. Press the button and one is drawn out of it at random.

That is the whole thing, and it runs on your own device.

Keeping them in an aquarium or pond

Many plants on this list are popular for aquariums and ponds, and if the generator handed you one to grow, a few practical points follow from the biology above.

Match the plant to its natural way of living. From the four groups above, a plant will only thrive if placed where it is built to live. A floating plant wants to drift on the surface, a submerged plant wants to be planted underwater, an emergent plant wants its roots wet and its top in the air. Trying to grow a plant against its nature, sinking a floater or submerging an emergent plant, fails, so identify which of the four types your plant is and give it the position it evolved for.

Start with the easy, forgiving species. For a beginner aquarium, some plants are famously tough and undemanding, and starting with these is far wiser than reaching for delicate ones. Plants like Java Fern, Anacharis and Java Moss on this list are renowned for tolerating a wide range of conditions and forgiving beginner mistakes, which is exactly why they are so widely recommended for new aquariums. Master keeping these hardy plants alive before attempting anything fussier, and you will learn the basics without constant failure.

Beware the aggressive growers. Some aquatic plants grow so vigorously that they become a serious problem, and this is a genuine warning. Fast-spreading floaters like Duckweed and Water Hyacinth can rapidly cover an entire pond surface, blocking light and choking the water beneath, and several plants on this list are invasive menaces in the wild for exactly this reason. Never release aquarium or pond plants into natural waterways, where they can cause ecological havoc, and be cautious even in your own pond about the vigorous spreaders, which can quickly take over.

Understand that water plants shape the whole water. Aquatic plants are not just decoration, they actively affect the water they live in, which is central to using them well. Submerged plants in particular oxygenate the water and take up nutrients, helping to keep an aquarium or pond healthy and balanced and competing with algae that would otherwise take over. This is why planted aquariums are often healthier and clearer than bare ones, the plants are doing real ecological work, and choosing good plants is part of keeping the water itself in good condition, not merely making it look nice.

Give them light, the one thing they cannot do without. Like all plants, aquatic plants need light to photosynthesise, and insufficient light is a common reason they fail, especially submerged ones living beneath the water where light is already dimmer. An aquarium with live plants generally needs proper lighting suited to plant growth, not just a dim bulb for viewing, and a pond needs enough sun. Match the plant's light needs to what you can provide, since a water plant starved of light will slowly fail no matter how good the water is.

Questions people ask

Do aquatic plants oxygenate the water?

Yes, and it is one of their most valuable roles, especially the submerged ones. Underwater plants photosynthesise using dissolved carbon dioxide and release oxygen directly into the water, which benefits fish and other aquatic life and is why submerged plants are often specifically called oxygenators. This is a real, useful function, part of why a well-planted aquarium or pond tends to be healthier and better balanced than a bare one. The plants help sustain the whole little ecosystem, adding oxygen by day and taking up the nutrients that would otherwise feed problem algae.

What is the difference between a water lily and a lotus?

They look similar and are often confused, but they are genuinely different plants, and the difference is visible once you know it. A water lily typically has leaves and flowers that float on or sit near the water's surface, with a notch cut into its round leaves. A lotus usually holds many of its large leaves and its flowers up high above the water on stems, standing clear of the surface, and its leaves are typically round without a notch. Both are beautiful and both are on this list, but the lotus tends to rise above the water while the water lily tends to rest upon it, which is the quickest way to tell them apart.

How do underwater plants get carbon dioxide?

They take it directly from the water, where it is dissolved, rather than from the air as land plants do. Gases like carbon dioxide and oxygen dissolve in water, and submerged aquatic plants absorb the dissolved carbon dioxide straight through their leaves from the surrounding water to photosynthesise. This is part of why many submerged plants have thin or finely divided leaves, maximising their surface area in contact with the water to absorb these dissolved gases efficiently. It is a real adaptation to their return to the water, drawing from the water what their land ancestors drew from the air.

Why are some of these considered invasive?

Because a number of aquatic plants, particularly the fast-growing floaters, spread so aggressively that they cause serious ecological damage when they escape into the wild, as touched on above. Plants like Water Hyacinth are among the world's worst aquatic weeds, capable of covering entire lakes and rivers, blocking light, depleting oxygen, and devastating the life beneath. This is precisely why you must never release aquarium or pond plants into natural waterways. The same vigorous growth that fills an aquarium quickly can, in the wild, choke a whole ecosystem, turning a beautiful plant into an environmental catastrophe.

Can I use this for an aquarium plan or a project?

Yes to both. For an aquarium or pond, pull a few and identify which of the four living-types each is and whether it is a hardy beginner plant or a demanding one, so you choose plants suited to your setup and your experience. For a project, the science here is genuinely fascinating, land plants returning to water, the four ways of aquatic living, the hidden danger of Water Hemlock. Start by working out how your plant lives in the water and where it sits, and a single pond plant opens onto a story of evolution, adaptation and the surprising return of land plants to the sea their ancestors left.

References

1. Cook, C. D. K. (1996). Aquatic Plant Book. Amsterdam: SPB Academic Publishing. https://www.worldcat.org/title/aquatic-plant-book
2. Les, D. H., Cleland, M. A. and Waycott, M. (1997). Phylogenetic studies in Alismatidae, II: evolution of marine angiosperms (seagrasses) and hydrophily. Systematic Botany, 22(3), 443 to 463. https://doi.org/10.2307/2419820
3. Schep, L. J., Slaughter, R. J., Becket, G. and Beasley, D. M. G. (2009). Poisoning due to water hemlock. Clinical Toxicology, 47(4), 270 to 278. https://doi.org/10.1080/15563650902904332