Βάζω τη γλάστρα μέσα όταν φυσάει πολύ.

Because τη is the definite article: the.

Here, γλάστρα is the direct object of βάζω (I put), so Greek uses the accusative case:

• η γλάστρα = the flowerpot / the plant pot (nominative)
• τη(ν) γλάστρα = the flowerpot (accusative)

So:

• Βάζω τη γλάστρα... = I put the flowerpot...

Greek often keeps the noun itself the same for feminine nouns like γλάστρα, and the article shows the case change.

τη is a shortened form of την.

Both are correct in modern Greek, but before many consonants, especially in everyday speech and writing, την is often written and pronounced as τη:

• την γλάστρα
• τη γλάστρα

In standard everyday Greek, τη γλάστρα is very natural.

A useful rule of thumb:

• Before vowels or certain consonants, you are more likely to keep την
• Before many other consonants, τη is very common

So here, τη γλάστρα is just the normal reduced form.

Because the Greek present tense often covers habitual actions, just like the English present simple.

So Βάζω τη γλάστρα μέσα όταν φυσάει πολύ means something like:

• I put the flowerpot inside when it’s very windy
• I bring the flowerpot inside when it blows a lot

This does not have to mean I am putting it inside right now. It can describe a general habit or routine.

Greek present tense can mean:

• what you do now
• what you do regularly
• what is generally true

Literally, βάζω means I put, I place, or I set.

In English, we might naturally say:

• I bring the flowerpot inside
• I put the flowerpot inside

Greek uses βάζω because the focus is on placing it somewhere.

So even if the English translation says bring inside, Greek is thinking more like:

• I put the flowerpot indoors

This is very normal Greek usage.

μέσα means inside or indoors.

In this sentence, it works as an adverb of place:

• Βάζω τη γλάστρα μέσα = I put the flowerpot inside

Greek can use μέσα by itself when the destination is understood.

You could also make it more explicit, for example:

• Βάζω τη γλάστρα μέσα στο σπίτι = I put the flowerpot inside the house

But in your sentence, just μέσα is enough.

Because that word order is very natural in Greek.

The basic structure is:

• Βάζω = I put
• τη γλάστρα = the flowerpot
• μέσα = inside

So the sentence follows a common pattern: verb + object + place/direction

Greek word order is more flexible than English, but this version sounds neutral and natural.

Other orders are possible for emphasis, but:

• Βάζω τη γλάστρα μέσα is the most straightforward here.

όταν means when.

It introduces a time clause:

• όταν φυσάει πολύ = when it blows a lot / when it’s very windy

So the whole sentence has:

1. a main clause: Βάζω τη γλάστρα μέσα
2. a subordinate time clause: όταν φυσάει πολύ

This is very similar to English:

• I put the flowerpot inside when it’s very windy.

φυσάει is the 3rd person singular present of φυσάω / φυσώ, which means to blow.

Here it refers to the wind or the weather:

• φυσάει = it’s blowing / it’s windy

Greek often uses this verb without an expressed subject, especially in weather expressions. English says it blows or it’s windy, but Greek just says:

• φυσάει

There is no need to add a word for it.

Because Greek often omits subject pronouns, especially when the verb ending already shows the person and number.

Also, with weather verbs, Greek commonly uses the verb on its own:

• βρέχει = it’s raining
• χιονίζει = it’s snowing
• φυσάει = it’s blowing / it’s windy

English needs a dummy subject like it, but Greek does not.

So:

• όταν φυσάει πολύ literally looks like when blows a lot
• but naturally means when it blows a lot / when it’s very windy

Here πολύ means a lot or strongly, and in natural English we often translate the whole phrase as:

• when it blows a lot
• when it’s very windy

So πολύ is modifying the verb φυσάει.

Compare:

• φυσάει πολύ = it blows a lot
• είναι πολύ μεγάλος = he/it is very big

So πολύ can correspond to very or a lot, depending on what it modifies.

Because many feminine nouns ending in -α have the same form in the nominative and accusative singular.

For this noun:

• η γλάστρα = nominative
• τη γλάστρα = accusative

The article changes, but the noun stays the same.

This is common with feminine nouns like:

• η πόρτα / την πόρτα
• η τσάντα / την τσάντα
• η γλάστρα / τη γλάστρα

So the case difference is shown mainly by the article here.

Yes. That would also be natural Greek.

• όταν φυσάει πολύ = when it blows a lot
• όταν έχει πολύ αέρα = when it’s very windy / literally when there is a lot of wind

Both are common, but they are phrased differently:

• φυσάει πολύ uses the verb to blow
• έχει πολύ αέρα uses the noun wind

Your original sentence is completely natural.

Strictly speaking, γλάστρα is the pot itself, the plant pot / flowerpot.

In everyday use, though, people sometimes use it loosely when talking about moving the whole potted plant. So depending on context, it may effectively refer to the potted plant.

That is why a sentence like this sounds natural: you move the pot, but really you are moving the whole plant indoors.

Yes, absolutely. In fact, that is the most natural reading.

Because both verbs are in the present tense:

• βάζω
• φυσάει

the sentence usually means a habitual or regular action:

• I put the flowerpot inside whenever it gets very windy

If you wanted to stress a single completed action in the past, Greek would use different forms.

φυσάει is pronounced roughly like fee-SA-ee.

It comes from the verb φυσάω / φυσώ. In this form, the ending creates a sequence that is written -άει.

So:

• φυσάει = he/she/it blows

This spelling is very common in verbs of this type. Even if it looks long, it is a normal present-tense form in modern Greek.