Die onkruid groei tussen die kruieplante.

Because each noun phrase has its own definite article.

• die onkruid = the weed / the weeds / the weed growth
• die kruieplante = the herb plants

In Afrikaans, die is the normal definite article for both singular and plural nouns, so it can mean English the in either case.

Onkruid is often used like a mass or collective noun in Afrikaans. That means it can refer to weed growth in general, not just one single weed.

So even though it does not look like an English plural, it can often be understood as:

• weed in a general sense
• or weeds, depending on context

This is one reason why direct word-for-word matching with English can feel a little tricky here.

No. Afrikaans verbs usually do not change form for person or number in the present tense.

So you get:

• ek groei = I grow
• jy groei = you grow
• die onkruid groei = the weed/weeds grow(s)

Unlike English, Afrikaans does not add an -s ending for he/she/it.

It can mean either, depending on context.

In Afrikaans, the simple present often covers both:

• grows
• is growing

So Die onkruid groei tussen die kruieplante can describe a general fact or something currently happening.

If you want to stress an ongoing action, Afrikaans can use other wording, for example:

• Die onkruid is besig om tussen die kruieplante te groei.

But the simple form groei is very normal.

Tussen usually means between or among, depending on the context.

In this sentence, English might choose either one:

• between the herb plants
• among the herb plants

Afrikaans uses the same preposition here.

Because Afrikaans usually writes compound nouns as a single word.

So:

• kruie
  • plante → kruieplante

This is very common in Afrikaans, just as in Dutch and German. English often writes similar ideas as two words, but Afrikaans normally joins them.

The last part, plante, is plural.

• singular: plant
• plural: plante

Since the last part of the compound is plural, the whole compound is plural:

• kruieplant = herb plant
• kruieplante = herb plants

The last element is the most important part grammatically.

It follows the normal main-clause order:

• Die onkruid = subject
• groei = verb
• tussen die kruieplante = prepositional phrase

So the pattern is basically:

subject + verb + rest

That is the most straightforward Afrikaans word order for a simple statement.

Yes. You can say:

Tussen die kruieplante groei die onkruid.

That is also correct.

Afrikaans is a verb-second language in main clauses, which means the finite verb usually stays in the second position. So when you move the prepositional phrase to the front, groei still comes next.

You would normally use the Afrikaans double negative:

Die onkruid groei nie tussen die kruieplante nie.

A common pattern is:

subject + verb + nie + rest + nie

That double nie is a very important feature of standard Afrikaans.