Το χώμα στη γλάστρα θέλει λίγο νερό.

Yes—θέλω usually means want, but in everyday Greek it is also very commonly used to mean need, especially in sentences like this.

So:

• Το χώμα θέλει νερό = The soil needs water
• literally, it is closer to The soil wants water

This is a very natural Greek way to speak. You will hear the same pattern in many everyday examples:

• Το φαγητό θέλει αλάτι. = The food needs salt.
• Το παιδί θέλει ξεκούραση. = The child needs rest.
• Το αυτοκίνητο θέλει βενζίνη. = The car needs petrol/gas.

So although the basic dictionary meaning is want, here the natural translation is need.

στη is the contraction of:

• σε = in, at, to, on
• τη(ν) = the (feminine accusative singular article)

So:

• σε τη(ν) γλάστρα → στη γλάστρα

In this sentence, στη γλάστρα means in the pot or in the flowerpot.

This contraction is extremely common in Greek:

• στο = σε + το
• στη = σε + τη(ν)
• στον = σε + τον
• στους = σε + τους
• στις = σε + τις

Greek nouns often do change by case, but in this particular noun the nominative and accusative singular forms are the same.

Here, the preposition σε takes the accusative, so after στη we expect the accusative form. For γλάστρα, that form is still γλάστρα.

So:

• nominative: η γλάστρα
• accusative: τη γλάστρα

The article changes clearly, while the noun itself stays the same in form.

In this sentence:

Το χώμα στη γλάστρα θέλει λίγο νερό.

the cases are:

• το χώμα — nominative
  It is the subject: the soil
• στη γλάστρα — accusative after σε
  It means in the pot
• λίγο νερό — accusative
  It is the direct object of θέλει: needs a little water

So the structure is basically:

• subject: το χώμα
• location phrase: στη γλάστρα
• verb: θέλει
• object: λίγο νερό

Because νερό is a neuter noun.

The adjective/quantifier λίγος, λίγη, λίγο changes to agree with the noun:

• λίγος for masculine
• λίγη for feminine
• λίγο for neuter

Since νερό is neuter, we get:

• λίγο νερό = a little water

Compare:

• λίγος καφές = a little coffee
• λίγη ζάχαρη = a little sugar
• λίγο γάλα = a little milk

Because Greek often omits the article with an indefinite amount of an uncountable substance, just as English often does.

So:

• λίγο νερό = a little water / some water

If you added an article, it would usually sound more specific:

• το νερό = the water

But here the meaning is not the water as a specific known water—it is simply some water or a little water. That is why no article is used.

Because the thing that needs water is the soil, not the pot itself.

• το χώμα = the soil
• η γλάστρα = the pot / flowerpot

So the sentence specifically says:

• The soil in the pot needs a little water

If you said Η γλάστρα θέλει λίγο νερό, that would sound like The pot needs a little water, which is less natural unless you mean the plant/pot setup more loosely in casual speech.

χώμα means soil, earth, dirt.

In this sentence it refers to the soil inside the flowerpot, so soil is the best translation.

A learner might wonder whether it means ground or earth more generally. It can, depending on context, but here the phrase στη γλάστρα makes it clear that it means potting soil / the soil in the pot.

It specifies which soil we are talking about.

So:

• Το χώμα θέλει λίγο νερό. = The soil needs a little water.
• Το χώμα στη γλάστρα θέλει λίγο νερό. = The soil in the pot needs a little water.

The phrase στη γλάστρα functions like a location phrase, but it also helps identify the noun: the soil that is in the pot.

Yes, absolutely.

That means:

• The soil of the pot needs a little water
• more naturally in English: The soil in the pot needs a little water

Both are natural, but the nuance is a little different:

• το χώμα στη γλάστρα = the soil in the pot
• το χώμα της γλάστρας = the soil of the pot / the pot’s soil

In many contexts, they are very close in meaning. The version with στη γλάστρα emphasizes location a bit more.

Yes, Greek word order is more flexible than English, but not every change sounds equally natural or keeps exactly the same emphasis.

The given sentence:

• Το χώμα στη γλάστρα θέλει λίγο νερό.

is very natural and neutral.

You could also hear:

• Το χώμα θέλει λίγο νερό στη γλάστρα.

but this may sound less clear, because στη γλάστρα could momentarily seem to go with νερό rather than with χώμα.

So the original order is good because it clearly groups το χώμα στη γλάστρα together.

A simple pronunciation guide is:

to HOMA sti GLA-stra THE-li LEE-go ne-RO

More carefully:

• Το = to
• χώμα = HO-ma (the χ is like the German ch in Bach, not like English h exactly)
• στη = sti
• γλάστρα = GLA-stra
• θέλει = THE-li
• λίγο = LEE-go
• νερό = ne-RO

The main written stress falls on:

• χώμα
• γλάστρα
• θέλει
• λίγο
• νερό

Because the subject is singular:

• το χώμα = the soil

So the verb must also be singular:

• θέλει = it needs

If the subject were plural, the verb would change too:

• Τα φυτά θέλουν λίγο νερό. = The plants need a little water.

It can be understood as either. In this sentence, λίγο νερό means:

• a little water
• a bit of water
• some water

The exact English wording depends on style, but the Greek idea is the same: a small amount of water.

Yes, very normal.

It sounds like something someone would naturally say when talking about a plant:

• Το χώμα στη γλάστρα θέλει λίγο νερό.

It is simple, idiomatic Greek, and especially useful because it shows several very common patterns at once:

• article + noun: το χώμα
• σε + article contraction: στη
• θέλω used as need
• quantity expression without article: λίγο νερό