La orquídea tiene dos flores.

Because la orquídea means the orchid: a specific orchid, not just any orchid.

In Spanish, a singular countable noun like orquídea normally needs an article or another determiner in this kind of sentence:

• la orquídea = the orchid
• una orquídea = an orchid
• mi orquídea = my orchid

So Orquídea tiene dos flores would sound incomplete or wrong in normal Spanish, unless Orquídea were a person’s name.

Because orquídea is a feminine noun in Spanish, so it takes la in the singular:

• la orquídea
• las orquídeas

This is grammatical gender, not biological sex. Even though it is a plant, the noun itself is treated as feminine.

The accent mark shows where the stress goes: or-QUÍ-de-a.

Without the accent, a Spanish speaker would expect the stress to fall in a different place. The written accent tells you to stress quí.

It is also useful to notice that orquídea has four syllables:

• or
• quí
• de
• a

A good pronunciation guide is:

la orquídea tiene dos flores
lah or-KEE-deh-ah TYEH-neh dohs FLOH-res

A few key points:

• qu before i sounds like k
• the u in quí is silent
• tiene starts with a sound like tye
• Spanish vowels are short and clear: a, e, i, o, u
• the r in flores is a single tapped r, not a long English r

Tiene is the 3rd person singular present tense of tener (to have).

Conjugation:

• yo tengo = I have
• tú tienes = you have
• él / ella / usted tiene = he / she / you have

Here the subject is la orquídea, which is singular, so the verb is tiene.

After a number, Spanish usually just uses:

number + noun

So:

• dos flores
• tres libros
• cuatro mesas

You would say las dos flores only if you mean the two flowers, referring to two specific flowers already known from the context.

So:

• tiene dos flores = it has two flowers
• tiene las dos flores = it has the two flowers

Because flor ends in a consonant, and many Spanish nouns that end in a consonant form the plural with -es:

• flor → flores
• animal → animales
• papel → papeles

If a noun ends in a vowel, it usually just adds -s:

• casa → casas
• orquídea → orquídeas

Usually, tiene is the best choice here because it expresses possession or what the plant has:

• La orquídea tiene dos flores. = The orchid has two flowers.

You could also say something with hay, but the focus changes:

• Hay dos flores en la orquídea. = There are two flowers on/in the orchid.

That sounds more like you are describing what exists there, rather than what the orchid has.

Está would not work for possession:

• está = is / is located
• tiene = has

Yes, if the context already makes it clear what you are talking about.

Spanish often leaves out the subject when it is understood:

• Tiene dos flores. = It has two flowers.

But if you are introducing the orchid for the first time, or if the listener may not know what tiene refers to, it is better to keep la orquídea.

Yes, Spanish word order is more flexible than English, but La orquídea tiene dos flores is the most neutral and natural order.

Other orders are possible, but they sound more marked:

• Tiene dos flores la orquídea.
• Dos flores tiene la orquídea.

These can sound emphatic, literary, or like you are highlighting a particular part of the sentence. For everyday learning, the basic order is the best one to use.

Usually orquídea refers to the orchid plant.

In this sentence, it clearly means the plant, because the sentence says it has two flowers:

• the orchid plant = la orquídea
• the flowers on it = dos flores

So the structure makes the meaning clear.