O broto está crescendo.

In Brazilian Portuguese, it is very common to use the definite article with nouns, especially when talking about a specific thing already understood in context.

So o broto means the sprout.

Leaving out the article can sometimes happen, but O broto está crescendo sounds more natural in ordinary speech if you mean a particular sprout.

Here, broto means sprout, shoot, or bud in the plant sense.

It is a masculine noun, which is why it uses o and not a.

Also, in some contexts in Brazilian Portuguese, broto can have other meanings, including slang meanings, but in this sentence it is clearly the literal plant meaning.

Está crescendo is the present progressive, like is growing in English. It emphasizes that the action is happening right now or around now.

• O broto está crescendo = The sprout is growing
• O broto cresce = The sprout grows / is growing / grows generally

In Portuguese, the simple present cresce can sometimes describe a general truth, a habitual action, or even a present event depending on context. Using está crescendo makes the ongoing action clearer.

Portuguese uses estar + gerund to talk about an action in progress.

So:

• está crescendo = is growing

You cannot use ser for this structure. Ser is used for identity, characteristics, origin, time, and similar ideas, not for ongoing actions.

So é crescendo would be wrong here.

Crescendo is the gerund of the verb crescer, which means to grow.

For many -er verbs, the gerund ends in -endo:

• comer → comendo
• beber → bebendo
• crescer → crescendo

So está crescendo literally works like is growing.

Because the subject is singular: o broto.

The verb estar must agree with the subject:

• o broto está = the sprout is
• os brotos estão = the sprouts are

So está is the third-person singular form, matching o broto.

The accent marks the stress: es-TÁ.

It also helps distinguish está from esta, which can be a demonstrative word meaning this in the feminine form, as in esta planta = this plant.

So the accent is important both for pronunciation and for distinguishing words.

Yes, you could, but the meaning is a little different.

• O broto está crescendo focuses on the action happening now.
• O broto cresce can sound more general, habitual, or less focused on the ongoing process.

If you want to match English is growing closely, está crescendo is the better choice in Brazilian Portuguese.

Yes, that word order is possible, but it is less neutral.

The most normal order is:

• O broto está crescendo

Putting the subject after the verb can sound more marked, poetic, or context-dependent. For a learner, the standard subject-verb order is the best default.

A rough English-friendly pronunciation would be:

oh BROH-too es-TAH kreh-SEN-doo

A few notes:

• o sounds like oh
• broto has stress on BRO
• está has stress on the last syllable: tá
• crescendo has stress on cen

The exact sounds vary by region, but this approximation is good enough to get started.

Yes. O broto está crescendo is a natural and correct sentence in Brazilian Portuguese.

It sounds like a normal way to describe a plant that is currently growing. If the context is clear, native speakers might also say things like:

• O broto tá crescendo in casual speech
• O broto cresceu = The sprout grew
• Os brotos estão crescendo = The sprouts are growing

So the sentence is both grammatical and natural.