Αν ποτίζεις συχνά τα λουλούδια, δεν μαραίνονται τόσο γρήγορα.

Αν means if.

The sentence has two parts:

• Αν ποτίζεις συχνά τα λουλούδια = If you water the flowers often
• δεν μαραίνονται τόσο γρήγορα = they don’t wilt so quickly

So it is a normal conditional sentence:
if X happens, Y happens.

Because this sentence describes a general truth or habitual situation, not one single future event.

• ποτίζεις = you water / you are watering
• μαραίνονται = they wilt / are wilting

With Αν + present, Greek often expresses something like:

• If you do this regularly, this is what happens.

So this sentence means something like:

• Whenever you water the flowers often, they don’t wilt so quickly.

If you wanted a more specific future idea, Greek would usually use different forms, for example:

• Αν ποτίσεις τα λουλούδια, δεν θα μαραθούν τόσο γρήγορα.
  = If you water the flowers, they won’t wilt so quickly.

ποτίζεις is the 2nd person singular present active form of ποτίζω (to water).

It means:

• you water
• you are watering

The ending -εις tells you the subject is you (singular).

So Greek does not need to say εσύ here, because the verb ending already shows who the subject is.

Greek often omits subject pronouns when they are not needed.

So:

• ποτίζεις already means you water
• μαραίνονται already means they wilt

Adding εσύ is possible, but it usually adds emphasis, contrast, or clarity:

• Αν εσύ ποτίζεις συχνά τα λουλούδια...
  = If you water the flowers often...

Without εσύ, the sentence sounds more neutral and natural.

Greek uses the definite article much more often than English.

So τα λουλούδια literally means the flowers, but depending on context it can correspond to English:

• the flowers
• sometimes just flowers

In Greek, using the article here is completely normal. English is more likely to omit it in general statements, but Greek usually keeps it.

τα λουλούδια is:

• neuter plural
• in the accusative case

Why accusative? Because it is the direct object of ποτίζεις:

• ποτίζεις τι; = you water what?
• τα λουλούδια = the flowers

Form breakdown:

• το λουλούδι = the flower
• τα λουλούδια = the flowers

That is a very common learner question.

μαραίνονται is the 3rd person plural present mediopassive form of μαραίνομαι, which means to wilt / wither.

In English, wilt is an ordinary active-looking verb:

• The flowers wilt.

But in Greek, many verbs describing a subject undergoing a change or state appear in the middle/passive form. So Greek says:

• Τα λουλούδια μαραίνονται.

Even though the meaning is not truly passive in English, the Greek form is.

So here:

• δεν μαραίνονται = they do not wilt

γρήγορα means quickly / fast.

τόσο means so, that much, or so much.

Together:

• τόσο γρήγορα = so quickly

With the negative δεν, the sense is:

• they don’t wilt so quickly
• they don’t wilt as quickly

So τόσο is a degree word: it tells you the wilting happens to a lesser degree or speed.

Yes. Greek word order is fairly flexible, especially with adverbs like συχνά.

The original sentence is perfectly natural:

• Αν ποτίζεις συχνά τα λουλούδια, δεν μαραίνονται τόσο γρήγορα.

But you could also hear:

• Αν ποτίζεις τα λουλούδια συχνά, δεν μαραίνονται τόσο γρήγορα.
• Τα λουλούδια δεν μαραίνονται τόσο γρήγορα αν τα ποτίζεις συχνά.

The basic meaning stays the same, but the emphasis can shift slightly.

Because the sentence begins with a subordinate conditional clause:

• Αν ποτίζεις συχνά τα λουλούδια

and then moves to the main clause:

• δεν μαραίνονται τόσο γρήγορα

In Greek, it is standard to separate that opening if-clause from the main clause with a comma.

A helpful rough pronunciation is:

An po-TI-zis sih-NA ta lou-LOU-thia, then ma-RE-non-de TO-so GRI-go-ra.

Main stress points:

• Αν
• ποτίζεις → stress on τί
• συχνά → stress on the last syllable
• λουλούδια → stress on λού
• μαραίνονται → stress on ραί
• τόσο → stress on τό
• γρήγορα → stress on γρή

If you want to sound natural, say it in two chunks:

• Αν ποτίζεις συχνά τα λουλούδια,
• δεν μαραίνονται τόσο γρήγορα.

Yes, in practice it can have a whenever / if sense because it describes a repeated, general situation.

So depending on context, it can feel like:

• If you water the flowers often, they don’t wilt so quickly.
• When you water the flowers often, they don’t wilt so quickly.
• Whenever you water the flowers often, they don’t wilt so quickly.

Greek Αν still means if, but with present tense in a general statement, the idea can overlap with whenever in English.