Die Gärtnerin meint, die Tulpe werde bald blühen, wenn es nachts nicht zu kalt ist.

Because this sentence uses indirect speech after meint.

• Direct speech: Die Tulpe wird bald blühen.
• Reported/indirect speech: Die Gärtnerin meint, die Tulpe werde bald blühen.

The form werde is Konjunktiv I, which is commonly used in German to report what someone says, thinks, or believes without fully presenting it as the speaker’s own statement.

So werde here is not random—it signals: this is what the gardener thinks/says.

In everyday spoken German, many people would also say wird instead, but werde is a standard and very typical written form of reported speech.

German often allows an indirect statement with or without dass after verbs like meinen, sagen, glauben, and denken.

So these are both possible:

• Die Gärtnerin meint, die Tulpe werde bald blühen.
• Die Gärtnerin meint, dass die Tulpe bald blühen werde / wird.

Without dass, the sentence can sound a bit more formal or written, especially with Konjunktiv I (werde).
With dass, it is often more straightforward for learners and very common in normal usage.

Because after meint, this is an indirect statement without dass, and that clause keeps main-clause word order:

• die Tulpe = subject
• werde = finite verb in second position
• bald blühen = rest of the clause

So the pattern is:

die Tulpe | werde | bald blühen

If you used dass, the finite verb would move later:

• ..., dass die Tulpe bald blühen werde.

So the word order depends on whether the clause is introduced by dass or not.

It is the verb phrase of the clause:

• werde = finite form of werden
• blühen = infinitive

Together, they express future meaning: the tulip will bloom.

But in this sentence, werde also carries the indirect-speech meaning because it is in Konjunktiv I. So it is doing two jobs at once:

1. helping form the future-like meaning
2. marking the statement as reported speech

That is why this form can feel a little advanced.

Yes, in everyday German, many speakers would say exactly that.

• ... werde bald blühen = more formal, standard reported speech
• ... wird bald blühen = very common in normal speech

So werde is especially useful to recognize in writing, news style, and more careful reported speech.
If you are speaking casually, wird will often sound more natural.

Gärtnerin is the feminine form of Gärtner.

• der Gärtner = male gardener
• die Gärtnerin = female gardener

The ending -in is a very common way to form feminine nouns for professions or roles in German.

Here die Gärtnerin is also the subject of the first clause, so it is in the nominative case.

Because Tulpe is a feminine noun, so its nominative singular article is die.

Here die Tulpe is the subject of the reported clause:

• die Tulpe = subject
• werde = verb

So this is nominative singular feminine.

nachts is an adverb meaning something like at night or during the night in a general sense.

In this sentence, it fits well because the speaker is talking about a general condition:

• wenn es nachts nicht zu kalt ist

That means something like: whenever / if the nighttime temperature is not too cold.

in der Nacht is also possible in some contexts, but nachts is very natural when talking about repeated or general nighttime conditions.

Because German uses es in impersonal weather and temperature expressions, just like English uses it:

• Es ist kalt. = It is cold.
• Es ist nachts zu kalt.

Here es does not refer to a specific thing. It is a dummy subject required by the expression.

So wenn es nachts nicht zu kalt ist is the normal structure.

Because zu kalt means too cold.

So:

• nicht kalt = not cold
• nicht zu kalt = not too cold

Those are different ideas.

The sentence does not say that the nights are warm. It only says they are not excessively cold—cold might still be possible, just not so cold that it prevents blooming.

Because wenn introduces a subordinate clause, and in German subordinate clauses the finite verb usually goes to the end.

So:

• wenn es nachts nicht zu kalt ist

This is standard subordinate-clause word order.

Compare:

• Main clause: Es ist nachts nicht zu kalt.
• Subordinate clause: ..., wenn es nachts nicht zu kalt ist.

That final ist is one of the most important word-order patterns in German.

Here it means if.

German wenn can mean:

• if for conditions
• when/whenever in some time-related contexts

In this sentence, it gives a condition for the tulip blooming, so if is the right interpretation:

• if it is not too cold at night

A learner should also remember:

• als = when for a single event in the past
• wenn = if / whenever / when in non-past repeated or conditional contexts

Because there are multiple clauses in the sentence, and German uses commas to separate them.

The sentence breaks into these parts:

1. Die Gärtnerin meint
2. die Tulpe werde bald blühen
3. wenn es nachts nicht zu kalt ist

So the commas mark the clause boundaries.

German comma usage is generally stricter than English comma usage, especially with subordinate clauses like the one introduced by wenn.