Fröna växer långsamt när det är kallt, men Sara tittar ändå på dem varje dag.

Because fröna means the seeds, while frön means just seeds.

Frö is a neuter noun, and its forms are:

• ett frö = a seed
• fröet = the seed
• frön = seeds
• fröna = the seeds

So in this sentence, fröna växer means the seeds are growing / the seeds grow.

Växer is the present tense of växa = to grow.

A useful thing about Swedish verbs is that they do not change depending on the subject:

• jag växer
• du växer
• Sara växer
• fröna växer

So unlike English, Swedish does not have a special -s form just for he/she/it.

Also, Swedish present tense can often translate as either:

• grow
• are growing

depending on context.

Because långsamt is an adverb, meaning slowly.

The adjective is:

• långsam = slow

But when describing how an action happens, Swedish often uses the -t form:

• Fröna växer långsamt = The seeds grow slowly

Compare:

• en långsam process = a slow process
• de växer långsamt = they grow slowly

So here långsamt describes the verb växer.

Here det is a dummy subject, similar to English it in it is cold.

Swedish often uses det for weather, temperature, time, and general conditions:

• Det är kallt = It is cold
• Det regnar = It is raining
• Det är sent = It is late

So det does not refer to a specific thing here. It is just required by the sentence structure.

In this sentence, när is the natural choice because it means something like when / whenever in a general situation.

• när det är kallt = when it is cold / whenever it is cold

That fits the idea that seeds grow slowly under cold conditions in general.

Om usually means if, and sometimes when in future or uncertain situations. But here, när sounds more natural because it describes a regular condition, not a hypothetical one.

Because titta på means look at.

• titta = look
• titta på något/någon = look at something/someone

So:

• Sara tittar på dem = Sara looks at them

If you only say tittar, it can sound incomplete unless the object is understood from context.

Because dem is the object form, meaning them.

Compare:

• de = they
• dem = them

In this sentence, the seeds are the object of the preposition på:

• på dem = at them

So dem is correct.

A useful note: in spoken Swedish, both de and dem are usually pronounced dom, but in standard writing they are still spelled differently.

Ändå means anyway, still, or nevertheless.

It shows contrast:

• the seeds grow slowly when it is cold,
• but Sara looks at them anyway

So ändå adds the idea of despite that.

In this sentence:

• men Sara tittar ändå på dem varje dag

means that even though the conditions are not ideal, Sara still keeps checking them.

Because this is a normal main clause in Swedish, and Swedish main clauses usually follow the verb-second pattern.

Here the clause starts with the subject:

• Sara = subject
• tittar = finite verb

So the order is:

• Sara tittar ...

After men (but), you still get a normal main clause.

Also, ändå comes after the verb here, which is very natural:

• Sara tittar ändå på dem

If you moved ändå to the front, the word order would change:

• Ändå tittar Sara på dem varje dag

That is also possible, but it gives ändå more emphasis.

Because Swedish often uses time expressions without a preposition.

• varje dag = every day
• varje vecka = every week
• i dag = today
• i morgon = tomorrow

So just like English says every day, Swedish also says varje dag directly.

The comma is very natural here because the sentence joins two clauses with men:

• Fröna växer långsamt när det är kallt
• men Sara tittar ändå på dem varje dag

In modern Swedish, commas before coordinating conjunctions are not always strictly required in short sentences, but many writers use them when the clauses are longer or when the contrast is clear. Here the comma is completely normal and helpful.

It can mean either, depending on context.

Swedish present tense often covers both:

• Fröna växer långsamt
  = The seeds grow slowly
  or
  = The seeds are growing slowly

English chooses between simple present and progressive more often than Swedish does. Swedish usually just uses the present tense and lets context do the work.