PlantNet Plant Identification

Review by eFreeware

You are walking a trail or crossing a vacant lot and something is flowering that you cannot name. A field guide could settle it, but matching a photo to a page takes patience, and the guide only covers one region. A phone in your pocket is faster, provided the app behind it knows what it is looking at.

PlantNet Plant Identification is that app. It comes from PlantNet, a project that has been collecting plant photographs since it arrived on Android in January 2014, and it now carries more than ten million installs and a 4.5 average across 264,308 ratings. The pitch is simple: photograph a plant, get a name, and let the picture join a research archive.

Who gets the most from a photo-based plant identifier

The app is built around wild plants. That takes in flowering plants, trees, grasses, conifers, ferns, vines, cacti and the wild greens people pick for salads. The developer also notes that it can name plenty of cultivated plants found in parks and gardens, though that is not what it is designed around. If most of your questions are about what grows untended, the fit is close.

That makes it a natural companion for hikers, campers, foragers, gardeners curious about volunteers that appear in beds, and anyone teaching children to look closely at what is underfoot. The project is explicit that it wants wild plants inventoried, including the ones sprouting through sidewalk cracks or turning up uninvited among vegetables.

I would not treat it as a reference for the plants you buy at a nursery. It will often have an answer, but the catalog and the community behind it are organized around the flora of open ground, and the app makes no secret of that emphasis.

How identification works, and what makes it accurate

You take a photograph of the plant and the app proposes a species. Accuracy depends heavily on what you photograph. Flowers, fruits and leaves are the most distinctive parts of a plant and are the best things to capture first, since species in the same genus can look nearly identical from a distance and differ only in small details.

The developer suggests that other features can help too: thorns, buds, or the hairs on a stem. A shot of the whole plant, or the whole tree, adds context, though on its own it usually is not enough for a dependable match. My reading is that one quick snapshot of a shrub from across a path will give a weaker result than a set of close, clear images.

The app recognizes around 20,000 species at present. The developer puts that against roughly 360,000 species on earth, which is a useful way to think about the odds: common and well-photographed plants are the safest bets, while something rare or regional may not be in the catalog. The collection grows as users contribute observations.

The citizen science side, and what happens to your photos

Every plant you photograph is gathered and studied by researchers who use the pictures to track how plant biodiversity is changing and to support conservation work. That is the part of the app I find most interesting. You are not just getting an answer; you are adding a data point to a long-running survey.

Observations can be reviewed by the community, and a good one may eventually be used in the photo gallery that illustrates a species. The revision system is weighted, with more influence given to users who have shown their skill through the number of species they have observed and had validated by others. In practice that means a newcomer's identification carries less weight than a veteran's.

If you would rather look things up without contributing, this design is worth weighing. The identification and the archive are the same system, so using the app means taking part in it.

Filters, floras and the tools added over the years

A 2019 release added a set of features that make the app easier to work with once the catalog gets large. You can narrow recognized species by genus or family, which helps when you already know you are looking at, say, a mint and want to know which one. Multi-flora identification searches every flora in the app rather than only the one you selected, which is handy when you are unsure which regional list applies.

You can also mark floras as favorites for quicker access, move through image galleries at different taxonomic levels, see your observations on a map, and follow links to factsheets for more background on a species. The map view in particular turns a scattered set of finds into something closer to a record of where you have been.

The most recent update adds a home screen widget, so a new observation can be started without opening the app first, and gives the species explorer trait filters that narrow a group to the plants matching what you can see, with the count of species for each value shown. That same release is described as faster and more stable, with crashes and rotation problems addressed.

What it costs

The app is free to download and use. There are no ads, and there are no in-app purchases. That is unusual for a tool of this size, and it matters: nothing interrupts an identification, and no part of the catalog sits behind a payment.

The trade is the one described above. The project is organized around research, and your photographs feed that work. For most people that is a fair exchange rather than a cost, but it is the reason the app exists in the form it does.

How it compares with other ways of naming a plant

The obvious alternative is a printed field guide or a regional flora. They explain distinguishing features in prose, and a good one covers its area in more depth than any app. What they cannot do is accept a photo and hand back a candidate list, and they do not travel well if you move between regions.

General search engines and image searches are another route, but they return pages, not identifications, and you still have to judge the match yourself. A dedicated botany reference is stronger on background and terminology but asks you to know what you are looking at before you can look it up.

PlantNet sits between the two. It is quicker than a guide and more structured than a search, and it comes with a community and a research project attached. The 20,000-species catalog is the limit to keep in mind when you compare it with a shelf of regional books.

A free identifier for anyone curious about wild plants

PlantNet is worth installing if you spend time outdoors and want names for what you pass. It asks nothing of your wallet, it works from photographs you were going to take anyway, and the results improve when you take the trouble to capture flowers, leaves and fruit rather than a single distant shot.

The caveats are built into the idea rather than bolted on. It is a wild-plant tool first, its catalog covers a fraction of the world's species, and it depends on contributions from the people who use it. Go in expecting a good first opinion on common plants and a reason to look more carefully, and it delivers that without clutter.

For hikers, gardeners, foragers, teachers and anyone who has ever wondered what that weed in the yard is called, this is an easy addition to the phone. Readers who want a reference for cultivated varieties, or who would rather not share their observations, will find the app's purpose points elsewhere.

What's new in version 3.27.3

Add the Pl@ntNet widget to your Home Screen and start a new observation without opening the app first. The species explorer now has trait filters, so you can narrow a group down to the plants matching what you see, with the number of species behind each value. This version is also faster and more stable, with many crashes and rotation issues fixed.