Planten er stadig levende.

In Danish, the definite article is often added to the end of the noun.

• en plante = a plant
• planten = the plant

So planten is the normal definite form of plante.

You use a separate word like den when there is extra emphasis, contrast, or an adjective:

• den grønne plante = the green plant
• den plante = that plant / that particular plant

Because plante is a common-gender noun in Danish.

Danish has two grammatical genders:

• common gender: takes en in the indefinite form, often -en in the definite form
• neuter gender: takes et in the indefinite form, often -et in the definite form

So:

• en plante → planten

If it were a neuter noun, you would expect et / -et instead.

Er is the present tense of at være, which means to be.

So:

• er = is / are

In this sentence, it links the subject planten with the description levende:

• Planten er levende = The plant is alive

This is the normal Danish way to describe a state, just like English uses is.

Here, stadig means still, in the sense of continuing up to now.

So the idea is:

• the plant was alive before
• and it is alive now as well

A useful warning: English still has more than one meaning, but Danish does not use stadig for all of them.

• stadig = still / still continuing
• stille = still / motionless / quiet

So in this sentence, stadig means still as in not dead yet, not motionless.

Because Danish main clauses normally follow the verb-second pattern.

In a simple statement, if the subject comes first, the finite verb usually comes next:

• Planten
  • er
    • stadig
      • levende

So the order is very normal Danish word order.

Compare:

• Planten er stadig levende.
• Jeg ved, at planten stadig er levende.

In the second example, after at, the word order changes, and stadig comes before er.

Levende is an adjective meaning alive or living. It is related to the verb at leve (to live).

It is also historically a present participle form, which is why it ends in -ende.

A very useful thing for learners: levende normally stays the same form.

• en levende plante
• et levende væsen
• levende planter
• Planten er levende

So unlike many other Danish adjectives, this one does not usually change form to match gender or number.

It can correspond to both, depending on the sentence.

In English, we usually say:

• The plant is alive
• a living plant

Danish can use levende in both kinds of situations:

• Planten er levende = The plant is alive
• en levende plante = a living plant

So Danish uses one word where English often switches between alive and living.

Yes. That is also correct and very natural.

• Planten er stadig levende = The plant is still alive
• Planten lever stadig = The plant is still alive / The plant is still living

The difference is small:

• er levende describes a state
• lever uses the verb to live

In everyday Danish, Planten lever stadig may sound a bit more direct and conversational, but both are fine.

Sometimes, yes. Endnu can also mean still or yet, depending on context.

But in this sentence, stadig is the most straightforward, everyday choice for an ongoing state.

For example:

• Planten er stadig levende. = very natural, neutral
• Planten lever endnu. = also possible, a bit different in tone, sometimes slightly more formal or literary

So as a learner, stadig is the safest word to use in this exact sentence.