Plönturnar vaxa betur þegar þær fá næga sól.

Plönturnar means the plants, while plöntur means just plants.

• planta = a plant
• plöntur = plants
• plönturnar = the plants

Icelandic usually adds the definite article onto the end of the noun instead of using a separate word like the in English. So the ending -nar here is the definite article for this plural form.

This is a normal noun change in Icelandic. The singular is planta, but the plural is plöntur. Two things happen:

• the vowel changes from a to ö
• the ending changes to -ur

So:

• planta = plant
• plöntur = plants
• plönturnar = the plants

This kind of vowel change is very common in Icelandic and has to be learned as part of the noun’s forms.

Because planta is a feminine noun in Icelandic.

In Icelandic, pronouns agree with the grammatical gender of the noun, not with whether something is biologically male or female. Since plöntur / plönturnar is feminine plural, the correct pronoun is þær = they for feminine plural nouns.

So:

• masculine plural they = þeir
• feminine plural they = þær
• neuter plural they = þau

Even though plants are not female in a real-world sense, the noun planta is grammatically feminine.

Þær refers back to plönturnar.

So the sentence is structured like this:

• Plönturnar vaxa betur = The plants grow better
• þegar þær fá næga sól = when they get enough sun

Using þær avoids repeating plönturnar again.

Because betur is an adverb, while betra is usually an adjective form.

Here, the word is describing how the plants grow, so Icelandic uses the adverb:

• vel = well
• betur = better
• best = best

Since vaxa is a verb, Icelandic needs the adverb:

• vaxa betur = grow better

By contrast, betra would be used in contexts where you need an adjective, for example something like a better thing in certain grammatical forms.

Here þegar means when.

It introduces a time clause:

• þegar þær fá næga sól = when they get enough sun

A learner may notice that þegar can also sometimes feel close to whenever depending on context. In this sentence it expresses a general truth: plants grow better when they receive enough sun.

Do not confuse this with the adverb þegar meaning already in other contexts. Icelandic uses the same word for both, and the meaning depends on the sentence.

Næga is the form of nægur meaning enough or sufficient, and it agrees with sól.

Here, sól is:

• feminine
• singular
• the object of fá

So the adjective must match that noun in gender, number, and case. That is why you get næga sól.

In other words:

• næg- = enough / sufficient
• -a here is the matching ending for this form

This agreement is a very important feature of Icelandic grammar.

Because Icelandic does not always use the definite article where English would.

Here sól means sun or more naturally sunlight in a general sense. The sentence is talking about enough sunlight as a substance or condition, not about one specific sun that needs to be marked as definite.

So:

• næga sól = enough sun / enough sunlight

This is similar to English, where we also often say enough sun rather than enough the sun.

Literally, sól means sun, but in sentences like this it often works like sunlight in English.

So fá næga sól is best understood as:

• get enough sun
• get enough sunlight

That is a very natural way to express this idea in Icelandic.

Yes, fá usually means get or receive, and that is exactly how it works here.

Icelandic often uses fá in the same broad way English uses get:

• fá hjálp = get help
• fá tíma = get time
• fá sól = get sun / receive sunlight

So þær fá næga sól means the plants receive enough sunlight.

The main clause comes first, and the þegar clause comes after it.

• Plönturnar vaxa betur = main statement
• þegar þær fá næga sól = time clause explaining when this happens

This is very natural word order in both Icelandic and English.

Also, the verb stays in normal second position in the main clause:

• Plönturnar = subject
• vaxa = verb
• betur = adverb

Then the subordinate clause begins with þegar.

Yes, but the meaning changes slightly.

• þegar þær fá næga sól = when they get enough sun
• ef þær fá næga sól = if they get enough sun

Þegar sounds like a general or regular condition tied to time or circumstance.
Ef sounds more conditional or hypothetical.

In a sentence describing a general fact about plants, þegar is very natural.

A rough guide is that þær sounds somewhat like thigh-r or thair, but not exactly like any normal English word.

A few pronunciation points:

• þ is like the th in thing
• æ is similar to the vowel in eye for many speakers, though pronunciation can vary
• r is an Icelandic r, usually trilled or tapped more than in most English accents

So it will not sound exactly English, but that rough approximation can help you recognize it.

Yes. It is a general statement: plants grow better when they get enough sunlight.

Icelandic often uses the present tense for general truths, just like English:

• Plönturnar vaxa betur... = The plants grow better...

Even though it is present tense, it does not mean only right now. It expresses something generally true.