Roślina doniczkowa jest zdrowa.

In Polish, adjectives often come before the noun, but not always.

In roślina doniczkowa, the adjective doniczkowa is acting more like a classifying label: it tells you what kind of plant it is. That noun + adjective order is very common in established terms and categories.

So:

• roślina doniczkowa = the normal, standard term
• doniczkowa roślina = possible, but less neutral and less common

A rough way to feel the difference is:

• roślina doniczkowa = a potted plant / houseplant as a type
• doniczkowa roślina = a more descriptive or contrastive phrasing, like emphasizing that the plant is potted

Because roślina is a feminine singular noun, and Polish adjectives must agree with the noun they describe.

So:

• roślina = feminine singular
• doniczkowa = feminine singular adjective, matching roślina
• zdrowa = feminine singular adjective, also matching roślina

Compare:

• kwiat doniczkowy jest zdrowy — masculine
• drzewko doniczkowe jest zdrowe — neuter
• roślina doniczkowa jest zdrowa — feminine
• rośliny doniczkowe są zdrowe — plural

The sentence uses the nominative for the subject phrase:

• roślina — nominative singular
• doniczkowa — nominative singular feminine, agreeing with roślina

And zdrowa is also in the nominative, because it is a predicate adjective after jest.

That is important because learners often notice that Polish sometimes uses the instrumental after jest:

• On jest lekarzem — lekarzem is instrumental

But with an adjective like healthy, Polish uses the nominative:

• Roślina jest zdrowa
• not Roślina jest zdrową

In a normal, complete sentence like this, jest should be there.

• Roślina doniczkowa jest zdrowa = standard Polish

Leaving it out would sound incomplete, elliptical, or like a note, headline, or very informal fragment:

• Roślina doniczkowa zdrowa — not the normal full-sentence version

So for standard speech and writing, keep jest.

Polish does not have articles like English a/an and the.

So roślina doniczkowa can mean either:

• a potted plant
• the potted plant

The context tells you which one is meant.

If Polish wants to be more specific, it can use other words, for example:

• ta roślina doniczkowa = this/the potted plant
• jakaś roślina doniczkowa = some potted plant

Yes. Polish word order is more flexible than English because the endings show grammatical relationships.

The most neutral order here is:

• Roślina doniczkowa jest zdrowa.

But other orders are possible for emphasis:

• Zdrowa jest roślina doniczkowa. — emphasizes healthy
• Roślina doniczkowa zdrowa jest. — possible, but marked and not the most natural everyday order

So the given sentence is the safest and most neutral version.

It literally comes from doniczka, which means flowerpot / plant pot.

So doniczkowa means something like:

• potted
• pot-grown
• sometimes, depending on context, houseplant

In everyday use, roślina doniczkowa is the normal term for a plant kept in a pot, especially indoors.

A rough English-friendly pronunciation is:

ro-SHLEE-na do-NEECH-KO-va yest ZDRO-va

A few key sounds:

• ś = a soft sh sound
• cz = like ch in church
• w = like English v
• j = like English y

Stress is usually on the second-to-last syllable in Polish:

• roślina
• doniczkowa
• zdrowa

Not in this sentence.

Here you need zdrowa, because it is a predicate adjective agreeing with the subject in the nominative:

• Roślina doniczkowa jest zdrowa.

But zdrową is a different case form, used in other structures, for example:

• Widzę zdrową roślinę doniczkową. — accusative
• Interesuję się zdrową rośliną doniczkową. — instrumental

So zdrową is a real form, just not the right one here.

You would say:

Rośliny doniczkowe są zdrowe.

Changes:

• roślina → rośliny
• doniczkowa → doniczkowe
• jest → są
• zdrowa → zdrowe

That is a good example of how both adjectives and the verb change to match number.

In this case, yes: roślina is a feminine noun, and the -a ending is a strong clue.

Many Polish nouns ending in -a are feminine, which is why the adjectives are:

• doniczkowa
• zdrowa

But it is still worth remembering that -a does not guarantee femininity in every single Polish noun. There are exceptions, especially some masculine nouns referring to people.

For roślina, though, feminine is exactly right.