Alta planto staras ĉe la fenestro.

Because alta is an adjective, and Esperanto adjectives normally end in -a.

• alta = tall
• planto = plant

So alta planto means a tall plant.

If an adjective describes a noun, it usually matches the noun in number and case. Here both are singular and not accusative, so:

• alta planto = singular, no -n

Esperanto has a definite article, la, meaning the, but it does not have a separate indefinite article like English a/an.

So:

• planto can mean a plant or just plant, depending on context.
• la planto means the plant.

That is why Alta planto can mean A tall plant.

La is the Esperanto word for the.

So:

• fenestro = window
• la fenestro = the window

Esperanto uses la much like English uses the. In this sentence, the speaker is referring to the window, not just any window.

Staras comes from stari, which means to stand.

In Esperanto, stari is often used for things that are upright or positioned in a standing way, even if they are not literally alive or standing on legs.

So:

• La planto estas ĉe la fenestro = The plant is by the window.
• La planto staras ĉe la fenestro = The plant stands by the window.

The second version gives a slightly more visual sense of position. It is very natural in Esperanto to use stari for objects like plants, bottles, lamps, and so on.

The ending -as marks the present tense in Esperanto.

So:

• stari = to stand
• staras = stands / is standing

Some common verb endings are:

• -as = present
• -is = past
• -os = future
• -us = conditional
• -u = command or wish
• -i = infinitive

So staras tells you the action or state is happening now.

Ĉe usually means at, by, with, or near, depending on context.

In this sentence, ĉe la fenestro means something like:

• by the window
• at the window
• near the window

It shows location, not movement.

So the plant is located next to or near the window.

Because ĉe is a preposition, and after a normal preposition Esperanto usually does not use -n.

• fenestro = window
• fenestron would be accusative

Here the phrase expresses location, not direction toward something. So the normal form is:

• ĉe la fenestro = by the window

You would only see -n after a preposition in special cases, usually when direction or motion is being emphasized in a way Esperanto allows. That is not happening here.

Yes. In Esperanto, adjectives can come before or after the noun.

So both are possible:

• alta planto
• planto alta

The version with the adjective before the noun is more common and often feels more neutral, especially for learners. Both mean tall plant, as long as the adjective agrees properly with the noun.

Not as fixed as in English.

Because Esperanto marks grammatical roles clearly, word order is fairly flexible. The basic sentence:

• Alta planto staras ĉe la fenestro.

could also be rearranged in some contexts, for example:

• Ĉe la fenestro staras alta planto.

Both are grammatical. The second one puts more emphasis on the location first: By the window stands a tall plant.

Still, the original order is a very normal, straightforward one for learners.

Ĉ is pronounced like ch in church.

So:

• ĉe sounds roughly like cheh

A few related Esperanto letters that English speakers often notice are:

• ĉ = ch as in church
• ŝ = sh
• ĵ = s in measure
• ĝ = j in judge

So ĉe la fenestro begins with a ch sound, not an s or k sound.