La alcachofa de hoy está muy buena.

Because alcachofa is a singular countable noun, and in Spanish you normally need an article with it unless there is some other determiner.

So la alcachofa means the artichoke. In this sentence, it usually refers to a specific one already understood from context, such as:

• the artichoke dish being served today
• today’s artichoke
• the artichoke they are talking about right now

English sometimes leaves things out more freely, but Spanish usually does not here.

Literally, de hoy means of today.

In natural English, you would usually translate it as:

• today’s
• for today
• from today

So la alcachofa de hoy is basically today’s artichoke.

This structure is very common in Spanish:

• el menú de hoy = today’s menu
• la sopa de hoy = today’s soup
• la clase de hoy = today’s class

Because estar is used to describe a current state, condition, or how something seems at that moment.

With food, estar bueno/a usually means:

• it tastes good
• it is good right now
• it turned out well

So La alcachofa de hoy está muy buena means the artichoke is very good today, in the sense of taste or quality right now.

If you used es, it would sound more like you are describing the artichoke as inherently good or classifying it in some more permanent way, which is less natural here.

Because adjectives in Spanish agree with the noun they describe.

Alcachofa is:

• feminine
• singular

So the adjective must also be:

• feminine
• singular

That gives buena.

Compare:

• el tomate está bueno
• la alcachofa está buena

Here it most naturally means tasty / delicious / very good to eat.

With food, estar bueno/a often refers to flavor. So:

• La alcachofa está buena = The artichoke tastes good.

It can also suggest overall quality, not just flavor, depending on context, but with food the idea of tasty is very common.

Because bien and buena do different jobs.

• bien is an adverb
• buena is an adjective

In this kind of sentence about food, bueno/a is the normal choice if you mean it tastes good.

Compare:

• Está muy buena = It’s very tasty / very good.
• Está muy bien = It’s very good / very nice / perfectly fine.

Está muy bien is possible, but it sounds more general and less specifically about taste.

It describes the noun phrase la alcachofa.

So the structure is:

• La alcachofa de hoy = today’s artichoke
• está muy buena = is very good

In other words, the sentence is about the artichoke of today, not about the act of being good happening today.

Yes, but it is slightly different.

• La alcachofa de hoy means today’s artichoke
• La alcachofa hoy está muy buena means something more like the artichoke is very good today

The first version ties today more directly to the noun. The second ties today more to the situation or timing of the statement.

In many contexts, both are possible, but de hoy is especially natural if you mean a specific dish, menu item, or serving for today.

Because Spanish often uses time words this way in set expressions.

In de hoy, hoy functions almost like today does in English in phrases such as today’s special or today’s class.

This is completely normal Spanish:

• la noticia de hoy = today’s news item / the news of today
• el especial de hoy = today’s special
• la alcachofa de hoy = today’s artichoke

So even though hoy is usually thought of as an adverb, in expressions like this it works naturally after de.

A very natural context would be food or hospitality, for example:

• at a restaurant
• at home during a meal
• in a market or food discussion
• when talking about today’s special dish

It could refer to:

• the artichoke dish served today
• the artichokes bought or cooked today
• the quality of today’s produce

So it sounds like something a person might say while eating or serving food.

Yes. In Spain, when talking about food, está muy buena means it’s very tasty.

But when talking about a person, está muy bueno/a can colloquially mean very attractive / really hot.

So:

• La alcachofa está muy buena = The artichoke is very tasty.
• Esa chica está muy buena = That girl is very attractive.
  This is colloquial and can sound crude depending on context.

With food, though, there is no problem: the meaning is clearly about taste.