Hoa này màu vàng.

In Vietnamese, demonstratives like này (this) usually come after the noun.

So:

• hoa này = this flower
• literally: flower this

This is normal Vietnamese word order.
Compare it with English:

• English: this flower
• Vietnamese: hoa này

You will see the same pattern in many other phrases:

• nhà này = this house
• xe này = this vehicle / this car
• người này = this person

Vietnamese often does not use a verb meaning to be when describing something with an adjective or a quality.

So:

• Hoa này màu vàng. = This flower is yellow.

There is no separate word for is here, but the sentence is still complete and natural in Vietnamese.

This is very common:

• Trời nóng. = The weather is hot.
• Cô ấy đẹp. = She is beautiful.
• Hoa này vàng. = This flower is yellow.

English needs is, but Vietnamese often leaves it out.

Màu means color. In this sentence, it helps express the flower’s color:

• màu vàng = yellow in color / the color yellow

So Hoa này màu vàng is literally something like:

• This flower, [its] color [is] yellow

This structure is natural in Vietnamese.

You can also hear:

• Hoa này vàng. = This flower is yellow.
• Hoa này có màu vàng. = This flower has a yellow color.

All of these are understandable, but they feel slightly different:

• Hoa này vàng = shorter, very common
• Hoa này màu vàng = focuses on color
• Hoa này có màu vàng = a bit fuller or more explicit

Yes. Hoa này vàng is a perfectly natural way to say This flower is yellow.

Both are possible:

• Hoa này màu vàng.
• Hoa này vàng.

The difference is mainly nuance:

• Hoa này vàng = simple description
• Hoa này màu vàng = explicitly talking about the flower’s color

In everyday speech, shorter forms like Hoa này vàng are very common.

By itself, hoa does not always mark singular or plural the way English does.

So depending on context, it can refer to:

• a flower
• flowers
• flower(s) in a general sense

In Hoa này màu vàng, the presence of này usually makes it feel like a specific item, so English often translates it as this flower.

If Vietnamese needs to be more specific, it can add other words, such as:

• bông hoa này = this flower (more explicitly one blossom)
• những bông hoa này = these flowers

Context is very important in Vietnamese.

A learner might wonder about this because Hoa is also a common Vietnamese personal name.

At the beginning of a sentence, hoa is capitalized anyway, so capitalization alone does not tell you much.

But in this sentence, hoa clearly means flower, because of the context:

• Hoa này màu vàng. = This flower is yellow.

If it were the person Hoa, the sentence would sound odd, because màu vàng describes color, and with này attached like this, it strongly points to a noun phrase meaning this flower.

So here, Hoa should be understood as flower, not a person’s name.

Vietnamese often uses classifiers, but they are not always required.

For flowers, you may hear:

• hoa này = this flower
• bông hoa này = this flower

Bông is a common classifier-like word for flowers and blossoms, and it can make the phrase more specific or natural in some contexts.

So both can work, depending on style and situation:

• Hoa này màu vàng.
• Bông hoa này màu vàng.

The second one may sound a bit more explicit to learners, but the first is also normal.

A useful way to see it is:

• hoa này = this flower
• màu vàng = yellow in color

So the sentence structure is roughly:

• noun + demonstrative + description

More literally:

• flower + this + color yellow

This is different from English, where you would say:

• this + flower + is + yellow

So Vietnamese and English organize the same idea differently.

Here is a simple tone breakdown:

• hoa – level tone
• này – low falling tone
• màu – low falling tone
• vàng – low falling tone

A rough learner-friendly guide:

• hoa sounds smooth and level
• này, màu, and vàng all have a falling tone

If you are learning pronunciation, it helps to practice slowly in chunks:

• hoa này
• màu vàng

Then say the whole sentence:

• Hoa này màu vàng.

Yes, it is natural and understandable.

Some nearby natural variants are:

• Hoa này màu vàng.
• Hoa này vàng.
• Bông hoa này màu vàng.
• Bông hoa này vàng.

A speaker might choose one over another depending on context, emphasis, or personal style.

So the original sentence is good Vietnamese, and it is a useful example for learning how Vietnamese expresses:

• this
• word order with nouns
• color descriptions
• the absence of is in many sentences