Vanningsbehovet er mindre i hvileperioden.

It is a compound noun, which is very common in Norwegian.

• vanning = watering
• behov = need
• vanningsbehov = watering need / need for watering
• vanningsbehovet = the watering need

So Norwegian often packs ideas into one word where English might use several words.

The ending -et is the definite article attached to the noun.

For a neuter noun like behov, you get:

• et behov = a need
• behovet = the need

Since vanningsbehov is built on behov, the whole compound takes the definite ending:

• et vanningsbehov = a watering need
• vanningsbehovet = the watering need

So instead of putting a separate word like the before the noun, Norwegian usually adds the definite ending to the noun itself.

Because Norwegian normally marks definiteness by adding an ending to the noun.

So:

• the watering need becomes vanningsbehovet
• the rest period becomes hvileperioden

This is one of the biggest differences from English. English uses a separate article; Norwegian often uses a suffix.

Mindre is the comparative form of liten / lite, and it usually means less or smaller, depending on context.

Here, vanningsbehovet er mindre means:

• the need for watering is less
• the plant needs less watering

In English, we would usually say less rather than smaller in this context, but Norwegian uses mindre naturally here.

Er is the present tense of å være = to be.

So:

• er mindre = is less

The sentence is simply stating a fact:

• Vanningsbehovet er mindre ... = The watering need is less ...

This is a standard Norwegian sentence pattern:

• subject + verb + complement

Here:

• Vanningsbehovet = subject
• er = verb
• mindre = complement
• i hvileperioden = time phrase

It is another compound/derived noun:

• hvile = rest
• periode = period
• hvileperiode = rest period / dormant period
• hvileperioden = the rest period

So i hvileperioden means in the rest period or during the dormant period.

In plant-related contexts, this often refers to the time when a plant is resting and growing less actively.

Because hvileperioden refers to a specific rest period, not just any rest period.

Compare:

• i en hvileperiode = in a rest period / during a rest period
  
  • more general
• i hvileperioden = in the rest period
  
  • a specific one, probably already understood from context

In care instructions or descriptions of plant growth, the rest period is often treated as a known, specific phase, so the definite form sounds natural.

Yes, absolutely.

These are both natural:

• Vanningsbehovet er mindre i hvileperioden.
• Behovet for vanning er mindre i hvileperioden.

The first version is more compact and uses a typical Norwegian compound noun.
The second version is more analytic and may feel a little easier for learners to understand at first.

Both are correct.

Because this is a main clause with no special element moved to the front.

Normal Norwegian main-clause order is:

• subject + verb + rest

So here:

• Vanningsbehovet = subject
• er = verb
• mindre i hvileperioden = rest of the sentence

If another element were placed first, the verb would still stay in second position, for example:

• I hvileperioden er vanningsbehovet mindre.

That is also correct and very natural.

Yes, mindre functions like an adjective here, but since it is a comparative form, it does not change for gender or number in this use.

So you can have:

• behovet er mindre
• plantene er mindre
• mengden er mindre

The form mindre stays the same.

A very literal structure-based gloss would be:

• The watering-need is less in the rest-period.

More natural English would usually be:

• The plant needs less water during the dormant period.
• Watering needs are lower during the rest period.

This helps show that Norwegian often uses noun compounds where English might prefer a different phrasing.

Roughly, you can think of it as:

• VAHN-ingz-beh-ho-vet

A few helpful points:

• vanning has a short a
• the s in the middle links the first and second part of the compound
• behov is pronounced with stress on the second syllable: be-HOV
• -et at the end is the definite ending

You do not need perfect pronunciation right away, but it helps to hear it as one long compound word rather than separate words.

Yes, very much so.

It sounds natural in contexts like:

• plant-care guides
• gardening books
• product labels
• advice about dormant seasons

Norwegian often uses precise compound nouns in this kind of practical writing, so vanningsbehovet fits that style well.