Moja vrtlarica kaže da svaka sadnica treba dovoljno vode i malo sjene.

Because vrtlarica is a feminine noun, so the possessive adjective moj has to agree with it.

Agreement here is:

• moj = masculine
• moja = feminine
• moje = neuter

So:

• moj vrtlar = my male gardener
• moja vrtlarica = my female gardener

Croatian adjectives and possessives usually change form to match the noun’s gender, number, and case.

Vrtlarica means female gardener.

It is the feminine form of:

• vrtlar = gardener (male or general masculine form)
• vrtlarica = female gardener

The ending -ica is a very common way to make a feminine noun in Croatian.

Kaže is the 3rd person singular present tense form of kazati / reći in the sense of says.

So:

• ja kažem = I say
• ti kažeš = you say
• on/ona kaže = he/she says

In this sentence, the subject is moja vrtlarica, which is she, so Croatian uses kaže.

Here da means that and introduces a subordinate clause.

So the structure is:

• Moja vrtlarica kaže = My gardener says
• da svaka sadnica treba... = that every seedling needs...

This is very common in Croatian:

• Mislim da... = I think that...
• Znam da... = I know that...
• Kaže da... = He/she says that...

In everyday English, that is often omitted, but in Croatian da is normally kept.

Because svaka sadnica means every seedling, and with every/each, Croatian normally uses the singular.

Here:

• svaka = every/each, feminine singular nominative
• sadnica = seedling, feminine singular nominative

They match because svaki/svaka/svako must agree with the noun.

Compare:

• svaki vrt = every garden
• svaka biljka = every plant
• svako drvo = every tree

So svaka sadnica is correct because sadnica is feminine singular.

Because the subject is svaka sadnica, and that is grammatically singular, even though the meaning refers to all seedlings one by one.

So Croatian treats it like:

• Every seedling needs...

not

• All seedlings need...

That is why the verb is:

• treba = needs / should have

not a plural form.

Here treba most naturally means needs.

So:

• svaka sadnica treba dovoljno vode = every seedling needs enough water

The verb trebati can be tricky because it can mean different things depending on the structure:

• Trebam vodu. = I need water.
• Treba mi voda. = I need water.
• Trebaš učiti. = You should study.
• Svaka sadnica treba dovoljno vode. = Every seedling needs enough water.

In this sentence, it expresses a practical requirement: the seedling needs water and some shade.

Because dovoljno is a quantity word meaning enough, and after quantity words Croatian usually uses the genitive.

So:

• dovoljno vode = enough water

Here:

• voda = water
• vode = genitive singular of voda

This is very common with quantity expressions:

• puno vode = a lot of water
• malo šećera = a little sugar
• dosta vremena = enough/plenty of time
• koliko novca = how much money

So dovoljno vode is not a direct object in the usual accusative sense; it is a quantity expression with the genitive.

For the same reason as dovoljno vode: malo is also a quantity word, so it usually takes the genitive.

So:

• malo sjene = a little shade

The noun is:

• sjena = shade, shadow

Its genitive singular is:

• sjene

So:

• malo sjene = a little shade

Not:

• malo sjenu — that would be accusative, which is not used after malo
• malo sjena — that would be genitive plural, which does not fit the intended meaning here

Yes. Both voda and sjena are feminine nouns ending in -a, and in the genitive singular many such nouns change -a to -e.

So:

• voda → vode
• sjena → sjene
• biljka → biljke
• kuća → kuće

That is a very common pattern for feminine -a nouns.

Not exactly. Sadnica is more specific than plant.

It usually means something like:

• seedling
• sapling
• young plant for planting/transplanting

So it refers to a plant prepared for planting, rather than just any plant in general.

A more general word would be:

• biljka = plant

So sadnica is the better choice if the sentence is about young plants in gardening.

Yes. Croatian word order is more flexible than English word order because case endings carry a lot of grammatical information.

The given sentence is natural and neutral:

• Moja vrtlarica kaže da svaka sadnica treba dovoljno vode i malo sjene.

But other orders are possible for emphasis, for example:

• Moja vrtlarica kaže da dovoljno vode i malo sjene treba svaka sadnica.
• Kaže moja vrtlarica da svaka sadnica treba dovoljno vode i malo sjene.

These alternatives are possible, but the original version is the most straightforward and natural for a learner.

Because Croatian has no articles.

So Croatian does not have direct equivalents of English a/an/the. The meaning is understood from context.

For example:

• vrtlarica can mean a gardener, the gardener, or gardener, depending on context
• sadnica can mean a seedling or the seedling

In this sentence:

• moja vrtlarica clearly means my gardener
• svaka sadnica clearly means every seedling

So no article is needed.

Yes, sjena is a normal and natural word for shade/shadow in this kind of sentence.

In gardening context, malo sjene means a little shade.

Learners sometimes associate sjena only with shadow, but it can also mean shade, especially when talking about sunlight and plants.

So:

• biljka treba malo sjene = the plant needs a little shade

is perfectly natural.