Latin plant names explained: how to crack a garden label

Shopping for new plants, what’s not to love? But the label of that lovely plant you spotted doesn’t just say “Hydrangea” but it has the addition “macrophylla“. What does that even mean? And what can you, as a gardener, actually do with all this Latin? The truth is: these Latin plant names aren’t as mysterious as they look. In fact, they’re a practical code that tells you quite a lot about the plant in your hands.

Latin plant names explained: why do we use them?

Botanical names aren’t some sort of elitist code meant to keep non-specialists out, but to prevent global confusion. Common names differ wildly. Take Artemisia vulgaris for example. In English it is usually referred to as mugwort. Or wormwood. Or common mugwort… But in Dutch (my native language) it’s called ‘bijvoet’. And in French they have yet again two common names: ‘l’Armoise commune’ and ‘Armoise citronnelle’.

But the Latin name? That’s the same worldwide! Talk to a Japanese gardener about Artemisia vulgaris and they will know what plant you mean. The botanical plant name makes sure everyone is talking about exactly the same plant.

This universal system dates back to the 18th century, when Swedish botanist Carl Linnaeus simplified plant naming. Before his time, plant names were often endless descriptions like “plant with red flowers that grows at the forest edge.” Linnaeus turned that into a neat two-part structure: genus and species.

The logic of the Latin plant name

There’s an entire naming convention – called a ‘nomenclature’ – for plants (including algae and fungi). And there’s a logical system to it. The system looks like a pyramid, with the highest level being the Kingdom (Plantae), and below that there are clades, orders, families, genuses, species, varieties and cultivars.

For your average garden plant names, however, you only need to know at least two parts:

• Genus (Hydrangea): like a family name, telling you which group the plant belongs to.
• Species (macrophylla): the name that makes it unique within that genus.

Sometimes you’ll see additions, such as:

• subsp. (subspecies),
• var. (variety),
• or a cultivar in single quotation marks, like Hydrangea macrophylla ‘Endless Summer’.

How to write Latin plant names

Latin plant names follow simple style rules that are worth remembering if you want to use them correctly.

• The genus name is always capitalized.
• The species name is written in lowercase.
• Both genus and species are written in italics: Hydrangea macrophylla.
• Cultivar names are capitalized but placed in single quotation marks: Hydrangea macrophylla ‘Endless Summer’.

Only the genus is capitalized. The species is never capitalized. This small detail makes a big difference if you want to write Latin plant names properly.

What can you read from Latin plant names?

If you know a little Latin, the second part of the name often gives away a clue:  

• Appearance: macrophylla = large leaves, alba = white, rubra = red.
• Origin: japonica (from Japan), canadensis (from Canada), alpina (from the mountains).
• Use or property: officinalis indicates a plant was once used medicinally, aquatica points to a preference for wet places.
• Tribute: the fuchsia was named after the German botanist Leonhart Fuchs.

So the name often tells you something you can connect directly to how the plant looks, where it comes from, or what it’s known for.

How does this help in the garden?

For gardeners, this knowledge is not just theoretical:

• Family ties: Knowing that Salvia officinalis (culinary sage) is related to Salvia nemorosa (ornamental sage) explains why both like sun and well-drained soil.
• Right spot: See alpina, and you know: mountain plant, likes cool air. Aquatica? Safe to place near your pond.
• Avoid confusion: If you’re looking for a specific ornamental cherry tree and ask your nursery for a Prunus, you might end up with a plum tree (Prunus domestica). But ask for a Prunus serrulata ‘Kanzan’ and you get a tree with the most magnificent Japanese cherry blossom.

Small pitfalls

Common names are cozy, but unreliable. Take “bluebell,” for instance: in England it usually refers to the Hyacinthoides non-scripta, while in Scotland and parts of the U.S. it may refer to Campanula rotundifolia. And in the American South, “bluebell” often points to Mertensia virginica. Three completely different plants, one shared name.

Even Latin names change from time to time, as botanists reshuffle plants with new insights. For example, the familiar autumn aster is now officially Symphyotrichum novi-belgii. Confusing perhaps, but the system remains the most reliable framework we have.

From secret code to useful key

Botanical names are not a secret script for scientists, but a universal code that helps gardeners as well. Learn to recognize a few basic words, and you’ll suddenly see where a plant comes from, how it grows, or what color it is.

So next time you’re in a garden center staring at a tongue-twisting Latin name on a label, you’ll know: it’s not a mystery, it’s a key. You just have to crack it.

FAQ: Latin plant names