Если будет тепло, роза скоро зацветёт.

That is a very common question.

In Russian, after если you can use the future tense when you are talking about a real future condition:

• Если будет тепло, ... = If it is / will be warm, ...

This is normal Russian. English usually prefers the present tense after if, but Russian does not have that restriction in the same way.

Compare:

• Если будет тепло, мы пойдём гулять. = If it’s warm, we’ll go for a walk.
• Если будет дождь, мы останемся дома. = If it rains, we’ll stay home.

So even though English says if it is, Russian naturally says если будет.

Russian does not use a dummy subject like English it in weather and general-condition expressions.

English says:

• It is warm
• It is cold
• It is dark

Russian simply says:

• тепло = (it is) warm
• холодно = (it is) cold
• темно = (it is) dark

So:

• Если будет тепло literally looks like If will-be warm
• but the natural English translation is If it is warm

This is called an impersonal construction: there is no real grammatical subject.

Because тепло here is not an adjective agreeing with a noun like warm rose or warm day. It is a predicative word meaning warm in the sense of the weather/conditions are warm.

Compare:

• тёплая роза = a warm rose or the warm rose
• тёплый день = a warm day
• здесь тепло = it is warm here

So in your sentence:

• Если будет тепло = If it is warm

You are describing the general condition, not describing a noun.

Also note the spelling:

• тёплый has ё
• тепло is spelled with е

Because these are two different grammatical situations.

1) будет тепло

Here будет is the future form of быть (to be), and тепло is not a verb. So Russian needs a separate future form of быть:

• будет тепло = it will be warm

2) зацветёт

This is a verb by itself: зацвести = to begin to bloom / to bloom

It is a perfective verb, and perfective verbs form the future with a single word:

• зацветёт = will bloom / will begin to bloom

So:

• будет тепло = future of быть
  • predicative word
• зацветёт = simple future of a perfective verb

Зацветёт is the future form of зацвести.

The basic idea is:

• цвести = to bloom, to be blooming
• зацвести = to begin to bloom, to come into bloom

So роза скоро зацветёт means not just that the rose will exist in a blooming state, but that it will start blooming soon.

In many English translations, this may simply appear as the rose will bloom soon, because that sounds natural in English. But the Russian verb has a slight nuance of beginning.

In this verb, за- often gives the meaning to start doing something.

So:

• цвести = to bloom / be blooming
• зацвести = to start blooming

This is a very useful pattern in Russian. A prefix can change both the meaning and the aspect of a verb.

A few similar examples:

• петь = to sing

• запеть = to start singing

• говорить = to speak
• заговорить = to start speaking

So зацвести is not just a random form; the prefix adds a clear meaning.

Not with the same meaning.

...роза скоро зацветёт

This means:

• the rose will soon begin to bloom
• a single upcoming event

...роза скоро будет цвести

This would mean something more like:

• the rose will soon be blooming
• focus on the process or state over a period of time

...роза скоро цветёт

This is not correct for standard future meaning.
цветёт is present tense, so it means is blooming, not will bloom.

So the best choice here is зацветёт, because it matches the idea of a future change that will happen soon.

Because роза is the subject of the verb зацветёт.

Ask the question:

• What will bloom?
• The rose → роза

Subjects normally go in the nominative case in Russian.

So:

• роза = nominative singular
• it is the thing performing the action of blooming

Because Если будет тепло is a subordinate clause introduced by если.

Russian normally separates this kind of clause with a comma:

• Если будет тепло, роза скоро зацветёт.

This is like English:

• If it’s warm, the rose will bloom soon.

If you reverse the order, Russian still uses a comma:

• Роза скоро зацветёт, если будет тепло.

So the comma is standard punctuation here.

Yes. Russian word order is flexible, though some orders sound more neutral than others.

Neutral order

• Если будет тепло, роза скоро зацветёт.

Reversed clause order

• Роза скоро зацветёт, если будет тепло.

This means essentially the same thing.

Inside the clause, word order can also shift for emphasis, but not every option sounds equally natural. For example:

• Если будет тепло = most neutral
• Если тепло будет = possible, but more marked or emphatic

And in the main clause:

• роза скоро зацветёт = neutral
• скоро роза зацветёт = puts more focus on soon
• роза зацветёт скоро = possible, but less neutral

So yes, word order can change, but the original sentence is a very natural standard version.

Скоро means soon, and here it modifies зацветёт:

• роза скоро зацветёт = the rose will bloom soon

It tells you when the blooming will happen.

Its position is somewhat flexible, but the most neutral place is before the verb:

• роза скоро зацветёт

Other possibilities:

• скоро роза зацветёт
• роза зацветёт скоро

These are all understandable, but they can shift the emphasis slightly.

With stress marks, it is:

• Е́сли бу́дет тепло́, ро́за ско́ро зацветёт.

A few useful notes:

• если → stress on the first syllable
• будет → stress on бу́-
• тепло → stress on the last syllable
• роза → stress on the first syllable
• скоро → stress on the first syllable
• зацветёт → stress on -тёт

Also remember:

• ё is always stressed, so зацветёт clearly has the stress on the final syllable

It normally refers to one future situation:

• If it gets warm, the rose will bloom soon.

The future tense in both parts points to a specific future possibility.

If you wanted a more general or habitual meaning, Russian would often use present-tense forms instead, depending on context. For example:

• Если тепло, розы быстро цветут.
  = When/if it’s warm, roses bloom quickly.

So your original sentence is best understood as a concrete future condition and result.