Questions & Answers about Если будет тепло, бутон раскроется завтра.
This is a very common difference between English and Russian.
In Russian, after если (if), you can use the future tense when the condition is about the future:
- Если будет тепло, бутон раскроется завтра.
Literally, this is closer to:
- If it will be warm, the bud will open tomorrow.
But that sounds unnatural in English, so English changes it to:
- If it is warm, the bud will open tomorrow.
So the Russian sentence is completely normal. Russian and English simply handle future conditions differently.