Si la rosa vuelve a florecer, sacaré una foto y la pondré en un marco bonito.

In Spanish, a real future condition is normally formed with:

si + present indicative + future

So:

Si la rosa vuelve a florecer, sacaré una foto...

This is the normal pattern for if the rose blooms again, I’ll take a photo...

English often uses the same idea: If it blooms, I’ll...
So Spanish does not usually say si volverá here.

Because this is a likely or possible future condition, and after si Spanish normally uses the present indicative, not the subjunctive:

• Si viene, hablamos.
• Si llueve, me quedaré en casa.
• Si la rosa vuelve a florecer, sacaré una foto.

A form like si vuelva would be wrong here.

Very roughly:

• si + present indicative = real/possible condition
• subjunctive after si is used in other, more hypothetical or unreal patterns, such as si volviera...

Volver a + infinitive means to do something again.

So:

• volver a florecer = to bloom again
• vuelve a florecer = blooms again / blooms once more

This is a very common structure in Spanish:

• Volví a leer el libro = I read the book again
• ¿Puedes volver a decirlo? = Can you say it again?

Here, volver still literally means to return, but in this structure it works like again.

Yes. Florecer de nuevo and volver a florecer both mean to bloom again.

So these are both natural:

• Si la rosa vuelve a florecer...
• Si la rosa florece de nuevo...

The version with volver a + infinitive is extremely common and often feels very natural in everyday Spanish.

In Spain, sacar una foto is very common for to take a photo.

Different regions prefer different expressions:

• sacar una foto — very common in Spain
• hacer una foto — also used in Spain
• tomar una foto — very common in much of Latin America

So for Spanish from Spain, sacar una foto is completely natural.

Because poner has an irregular future stem.

The future of poner is built from pondr-, not from the full infinitive:

• pondré
• pondrás
• pondrá
• pondremos
• pondréis
• pondrán

This is similar to other irregular future stems:

• tener → tendré
• salir → saldré
• venir → vendré
• hacer → haré
• decir → diré

So la pondré means I will put it.

La is a direct object pronoun, and it refers to una foto.

So:

• sacaré una foto = I’ll take a photo
• la pondré en un marco bonito = I’ll put it in a nice frame

Spanish often avoids repeating the noun when it’s already clear. Since foto is feminine singular, the pronoun is la.

Yes, absolutely.

Both are correct:

• Pondré la foto en un marco bonito
• La pondré en un marco bonito

Using la is more natural here because una foto was just mentioned, so repeating la foto is unnecessary.

What you normally would not say is:

• la pondré la foto... ❌

because that repeats the object in a way that does not work in this sentence.

Because poner en means to put in / into / onto, depending on context.

A marco is a frame, and the natural expression is:

• poner algo en un marco = to put something in a frame
• enmarcar algo = to frame something

Spanish uses en here because the photo ends up in the frame.

In Spanish, adjectives often come after the noun in their most neutral, descriptive use.

So:

• un marco bonito = a nice/pretty frame

That is the normal order. If you put the adjective before the noun, it can sound more literary, subjective, or emphatic:

• un bonito marco

That is possible, but un marco bonito is the most straightforward choice here.

La rosa suggests a specific rose that the speaker has in mind, probably one already known from the context.

Compare:

• la rosa = the rose / that rose
• una rosa = a rose, one rose

So this sentence sounds like the speaker is talking about a particular rose, not just any rose in general.