Roślina poradzi sobie bez nawozu.

It means will manage, will cope, or will do fine.

The key thing is that poradzić sobie is a fixed expression. You should learn it as one unit, not as just poradzić plus a random extra word.

• radzić / poradzić on its own can relate to advising
• radzić sobie / poradzić sobie means to cope, to manage

So in this sentence, poradzi sobie does not mean will advise herself/itself. It means will manage.

In radzić sobie / poradzić sobie, sobie is part of the expression.

It is historically the dative form of self/oneself, but in modern Polish, in this phrase, learners should mostly treat it as part of the verb pattern:

• radzić sobie = to cope / to manage
• poradzić sobie = to manage successfully / to cope

You usually cannot just remove sobie and keep the same meaning.

Compare:

• Roślina poradzi sobie. = The plant will manage.
• On poradzi komuś. = He will advise someone.
  This is a different verb meaning.

Because poradzić sobie is a perfective verb.

In Polish, perfective verbs do not normally have a true present tense meaning. Their present-looking forms usually refer to the future.

So:

• radzi sobie = is managing / manages (imperfective)
• poradzi sobie = will manage (perfective)

That is why Roślina poradzi sobie bez nawozu is understood as The plant will manage without fertilizer.

The infinitive is poradzić sobie.

Here is the pattern:

• poradzić sobie = perfective infinitive
• poradzi = 3rd person singular form

So:

• ja poradzę sobie
• ty poradzisz sobie
• on/ona/ono poradzi sobie

Since roślina is singular, we use poradzi.

This is an aspect difference.

• radzić sobie is imperfective
• poradzić sobie is perfective

Very roughly:

• radzić sobie focuses on the process, habit, or ongoing ability
  → to manage, to be coping
• poradzić sobie focuses on successful completion or a one-time result
  → to manage, to cope successfully

Examples:

• Roślina radzi sobie bez nawozu.
  = The plant manages/is managing without fertilizer.

• Roślina poradzi sobie bez nawozu.
  = The plant will manage without fertilizer.

So the sentence suggests confidence about the outcome.

Because the preposition bez always takes the genitive case.

The dictionary form is:

• nawóz = fertilizer

After bez, it changes to the genitive singular:

• bez nawozu = without fertilizer

So this is a standard case pattern:

• bez + genitive

Other examples:

• bez wody = without water
• bez czasu = without time
• bez problemu = without a problem

It is in the nominative singular, because it is the subject of the sentence.

• roślina = plant
• It is a feminine noun
• Here it is doing the action of managing

So:

• Roślina poradzi sobie...
  = The plant will manage...

It is singular genitive.

The base form is:

• nawóz = fertilizer

After bez, it becomes:

• nawozu = of fertilizer / without fertilizer

This usually means without fertilizer in a general, uncountable sense, not without one specific fertilizer item.

If you wanted plural, that would be different:

• bez nawozów = without fertilizers

But in this sentence, singular is the natural choice.

Because Polish has no articles.

English uses articles:

• the plant
• a plant

Polish usually just says:

• roślina

Whether it means the plant, a plant, or plants in general depends on context.

So Roślina poradzi sobie bez nawozu could mean:

• The plant will manage without fertilizer
• A plant will manage without fertilizer
• or more generally, depending on context

In most real situations, context makes it clear.

Yes. It is a flexible expression.

Depending on context, poradzić sobie can be translated as:

• manage
• cope
• handle it
• get by
• do fine

In this sentence, natural translations include:

• The plant will manage without fertilizer.
• The plant will cope without fertilizer.
• The plant will do fine without fertilizer.

No, Polish word order is fairly flexible.

The neutral order here is:

• Roślina poradzi sobie bez nawozu.

But other orders are possible, for example:

• Bez nawozu roślina sobie poradzi.
• Roślina bez nawozu sobie poradzi.

These variations can shift emphasis slightly:

• Bez nawozu at the beginning emphasizes without fertilizer
• Roślina at the beginning is a neutral subject-first sentence

So the original sentence is natural and standard, but not the only possible order.

Yes. Because poradzi sobie is perfective, it often suggests a successful result.

So the sentence does not just describe a general ability in an abstract way. It often sounds like:

• The plant will be fine without fertilizer
• The plant can manage without fertilizer
• The plant will cope

It gives the sense that fertilizer is not necessary for the plant to get by.

Yes. A very common alternative is:

• Roślina da sobie radę bez nawozu.

This also means:

• The plant will manage without fertilizer.

Both are natural:

• poradzi sobie
• da sobie radę

The second one is often very common in everyday speech. The first one is also completely normal and slightly more compact.

A rough English-friendly guide:

• roślina ≈ rosh-LEE-na
• poradzi ≈ po-RA-dji
• sobie ≈ SO-bye
• bez ≈ bez
• nawozu ≈ na-VO-zu

A few helpful notes:

• ś is a soft sh-like sound
• dz in poradzi sounds a bit like the j in jam, but softer depending on context
• się/sobie often has a soft s sound before vowels

If you are learning pronunciation seriously, it is best to listen to native audio, because Polish soft consonants are hard to capture perfectly in English spelling.