В апреле мама любит сажать рассаду на грядке, даже если на улице ещё прохладно.

Because after в when you mean in a month, Russian uses the prepositional case.

• апрель = April
• в апреле = in April

This is the normal pattern for months:

• в январе = in January
• в мае = in May
• в апреле = in April

So В апреле sets the time frame: In April.

Любить + infinitive is a very common way to say that someone likes or loves doing something.

So:

• мама любит сажать = Mom likes/loves planting

It works much like English likes to plant or likes planting.

In Russian, this construction often describes:

• a habit
• a preference
• something someone enjoys in general

Here it means this is something she generally likes doing in April.

This is about verb aspect.

• сажать = imperfective
• посадить = perfective

Russian uses the imperfective here because the sentence talks about a habitual or repeated activity, not one single completed act.

So:

• сажать = to plant, to be planting, to plant regularly
• посадить = to plant successfully / to plant once and complete the action

Since the meaning is something like In April Mom likes planting seedlings, the imperfective сажать is the natural choice.

Рассада means seedlings, young plants for transplanting, or plant starts.

It appears as рассаду because it is the direct object of сажать, so it is in the accusative case.

• nominative: рассада
• accusative: рассаду

This change is normal for many feminine nouns ending in -а:

• книга → книгу
• машина → машину
• рассада → рассаду

A useful point: in English we often translate this as a plural idea, seedlings, but in Russian рассада is often treated as a collective noun in the singular.

Russian normally says на грядке for in/on the garden bed.

• грядка = garden bed, raised bed, vegetable patch row
• на грядке = in the garden bed / on the bed

Even though English usually says in the bed, Russian prefers на here. It is just the normal idiomatic preposition with this noun.

Also, грядке is the prepositional case after на when talking about location:

• грядка
• на грядке

Yes, literally улица means street, so на улице literally looks like on the street. But in everyday Russian, на улице very often means:

• outside
• outdoors
• outside the house/building

So in weather expressions:

• На улице тепло. = It’s warm outside.
• На улице дождь. = It’s raining outside.
• На улице ещё прохладно. = It’s still chilly outside.

This is a very common expression, and learners should treat it as standard Russian usage.

Даже если means even if.

It introduces a clause that shows contrast or concession:

• даже если на улице ещё прохладно = even if it is still chilly outside

The idea is: Mom likes planting seedlings in April despite the cool weather.

So this part adds the sense:

• the weather may not be ideal,
• but she still likes doing it.

Here ещё means still.

So:

• ещё прохладно = it is still chilly / it is still cool

This shows that the cool weather continues at that time.

Be careful: ещё can also mean more or another in other contexts. But in weather/time situations, it often means still.

Examples:

• Ещё рано. = It’s still early.
• Ещё холодно. = It’s still cold.
• На улице ещё прохладно. = It’s still chilly outside.

Because Russian often uses a special impersonal predicate for weather and general conditions.

• прохладно = cool, chilly

There is no specific noun here that the word needs to agree with. The sentence is not saying the street is cool or the air is cool. It is simply stating a general condition:

• На улице прохладно. = It’s cool outside.

This is extremely common in Russian:

• холодно = it’s cold
• жарко = it’s hot
• тепло = it’s warm
• прохладно = it’s cool/chilly

So прохладно is exactly what Russian normally uses in this kind of sentence.

Because даже если на улице ещё прохладно is a subordinate clause.

Russian normally separates subordinate clauses with commas, so the comma before даже если is required.

Main clause:

• В апреле мама любит сажать рассаду на грядке

Subordinate clause:

• даже если на улице ещё прохладно

So the comma works like this:

• main idea first
• then an additional clause beginning with even if

It can be either, depending on tone.

• любит literally comes from любить, which often means to love
• but in sentences about activities, it very often translates naturally as likes

So:

• мама любит сажать рассаду can be
  • Mom likes planting seedlings
  • Mom loves planting seedlings

If you want the most neutral English translation, likes is often safer.
If you want to keep the stronger emotional flavor of Russian любить, loves can also work.

Yes. Russian word order is fairly flexible.

This sentence begins with В апреле to set the time first:

• В апреле мама любит сажать рассаду...

That is natural and emphasizes in April.

Other orders are possible, for example:

• Мама любит сажать рассаду на грядке в апреле...

But that sounds slightly different in focus. Russian word order often changes emphasis, not the core meaning.

So the given order is good because it immediately tells the listener when this habit happens.

It describes a general habit or preference, not one specific event.

Several features show that:

• В апреле = a recurring time frame
• любит = likes / enjoys
• сажать imperfective = habitual activity

So the sentence means something like:

• In April, Mom likes planting seedlings in the garden bed, even if it’s still chilly outside.

If Russian wanted to describe one single completed planting event, it would be built differently.