Wstaw proszę kwiaty do wazonu.

Wstaw is the imperative form of the verb wstawić, so it means put in / place in / set in.

In this sentence, it is a command or request addressed to one person you speak to as ty:

• wstaw = put (it/them) in
• full dictionary form: wstawić

With kwiaty do wazonu, it means something like put the flowers into the vase.

Because wstawić is the infinitive: to put in / to place in.

Polish uses a special verb form for commands:

• wstawić = to put in
• wstaw! = put it in!

So just like English uses to sit versus sit!, Polish uses wstawić versus wstaw!

Proszę here works like please. Polish often places it after the imperative:

• Wstaw proszę kwiaty do wazonu.

That sounds natural and polite.

You can also hear:

• Proszę, wstaw kwiaty do wazonu.
• Wstaw kwiaty do wazonu, proszę.

All of these can mean the same thing, but Wstaw proszę... is a very common everyday pattern.

It is polite in tone, but still informal in grammar.

The imperative wstaw is used when speaking to one person informally: ty.

So you would use it with:

• a friend
• a family member
• a child
• someone you are on ty terms with

For a more formal version, Polish would usually say something like:

• Proszę wstawić kwiaty do wazonu.
• Czy może Pan / Pani wstawić kwiaty do wazonu?

So the original sentence is best understood as a friendly, polite request to one person.

Because kwiaty is the correct form for the direct object here.

The noun is:

• singular: kwiat = flower
• plural: kwiaty = flowers

In this sentence, kwiaty is in the accusative plural, because it is the thing being put somewhere.

For this noun, the accusative plural looks the same as the nominative plural:

• kwiaty = flowers

So:

• Kwiaty są na stole. = The flowers are on the table.
• Wstaw kwiaty do wazonu. = Put the flowers into the vase.

Same visible form, different grammatical function.

Because Polish uses do to express movement into something, and do requires the genitive case.

So:

• wazon = base form
• do wazonu = into the vase / to the vase

This is a very common pattern:

• do domu = into/to the house
• do pudełka = into the box
• do torby = into the bag

If you used w wazonie, that would mean in the vase as a location, not movement into it.

Compare:

• Kwiaty są w wazonie. = The flowers are in the vase.
• Wstaw kwiaty do wazonu. = Put the flowers into the vase.

This is the classic Polish difference between movement toward/into something and location inside something.

• do wazonu = into the vase → direction, destination
• w wazonie = in the vase → location, no movement

So:

• Wstaw kwiaty do wazonu. = move the flowers so they end up inside the vase
• Kwiaty są w wazonie. = the flowers are already there

English often uses in for both ideas, but Polish clearly separates them.

These verbs are related, but they are not exactly the same.

• wstawić = put/set something into something, often something upright or placed into a container or space
• włożyć = put in, insert
• wsadzić = put in/stick in, often more colloquial or rougher
• postawić = put/set something standing somewhere

With flowers and a vase, wstawić kwiaty do wazonu sounds very natural in Polish.

Why?

Because you are not just inserting an object into a container. You are placing flowers into a vase in the normal practical sense.

Other possibilities may also occur depending on context:

• Włóż kwiaty do wazonu — possible, but slightly more like put them in
• Postaw kwiaty w wazonie — not quite right for this exact meaning
• Wsadź kwiaty do wazonu — possible, but more casual and less elegant

So wstaw is a very natural choice here.

In this sentence, it most naturally means cut flowers—for example a bouquet or flowers someone has brought home.

That is because putting something do wazonu strongly suggests a vase with water, which is where cut flowers go.

So even though kwiaty literally just means flowers, the context makes the intended meaning clear.

Wstawić is a perfective verb. Perfective verbs focus on a completed action or a single whole event.

That fits this sentence well, because the speaker wants one complete result:

• the flowers should end up in the vase

So Wstaw kwiaty do wazonu means something like:

• Put the flowers into the vase
• Get the flowers into the vase

If you used the imperfective wstawiać, the imperative wstawiaj would usually sound different in meaning, for example:

• repeated action
• process
• habitual instruction
• sometimes go ahead and be putting...

For a simple one-time request, wstaw is the normal choice.

Yes, Polish word order is flexible, though some versions sound more natural than others.

The neutral version is:

• Wstaw proszę kwiaty do wazonu.

You could also hear:

• Wstaw kwiaty do wazonu, proszę.
• Kwiaty wstaw proszę do wazonu.

But changing the order often changes the focus or emphasis.

For example:

• Kwiaty wstaw proszę do wazonu may emphasize the flowers rather than something else
• Do wazonu wstaw proszę kwiaty may emphasize into the vase

So yes, the order can change, but the original sentence is a very natural neutral one.

It is pronounced roughly like f-stav.

A few helpful points:

• w in Polish sounds like English v
• but before the voiceless s, it gets devoiced, so it sounds more like f
• st is pronounced clearly
• aw here sounds roughly like av

So wstaw is approximately:

• fstav

This kind of consonant devoicing is very normal in Polish pronunciation.

No, not in this form.

Because the structure is:

• wstaw
  • kwiaty
    • do wazonu

That clearly means put the flowers into the vase.

If you wanted to say put the vase with flowers somewhere, Polish would need a different structure, for example with wazon as the object:

• Wstaw wazon z kwiatami do pokoju. = Put the vase with flowers into the room.

So in the original sentence, kwiaty are the thing being moved, and do wazonu is their destination.