Mi madre tiene encargado un ramo sencillo en la floristería del barrio.

In this sentence, tener + past participle expresses a resulting state: something has already been arranged and is currently on order.

So Mi madre tiene encargado un ramo sencillo means something like:

• my mother has a simple bouquet ordered
• my mother has already ordered a simple bouquet
• my mother has a simple bouquet on order

It does not mainly focus on the moment when she placed the order. It focuses on the fact that the arrangement is already in place.

Because encargado agrees with un ramo sencillo, not with mi madre.

In this structure, the past participle behaves a bit like an adjective describing the thing that is ordered:

• un ramo → masculine singular
• so: encargado

If the object changed, the participle would change too:

• Mi madre tiene encargada una cesta.
• Mi madre tiene encargados dos ramos.
• Mi madre tiene encargadas unas flores.

This is a very common question for English speakers, because English does not show this kind of agreement.

The difference is mainly one of focus.

• Mi madre ha encargado un ramo sencillo
  = focuses on the action of ordering

• Mi madre tiene encargado un ramo sencillo
  = focuses on the current situation or result: the bouquet is already ordered

In many real situations, both could be translated similarly into English, but the nuance is different.
A useful comparison is:

• He reservado una mesa = I reserved a table
• Tengo reservada una mesa = I have a table reserved

Encargar often means:

• to order something in advance
• to commission something
• to ask someone to prepare or obtain something
• in other contexts, to entrust someone with a task

Here, because the sentence mentions a florist, encargar means to order a bouquet from a shop.

So this is not about being in charge of something. It is about placing an order.

Yes. Encargado can also be a noun or adjective meaning the person in charge, manager, or supervisor.

For example:

• El encargado de la tienda = the person in charge of the shop

But in your sentence, encargado is not a noun meaning manager. It is the past participle of encargar, used with tener.

Here ramo means bouquet.

In other contexts, ramo can mean other things, such as:

• branch
• bunch
• field/sector in certain expressions

But with floristería, the meaning is clearly bouquet of flowers.

Because in Spanish, descriptive adjectives are often placed after the noun.

So:

• un ramo sencillo = a simple/plain/modest bouquet

This is the normal, neutral order.

If you put the adjective before the noun, un sencillo ramo, it can sound more literary, emphatic, or stylistically marked. For everyday Spanish, un ramo sencillo is the natural choice.

Here sencillo most naturally means simple, modest, or not elaborate.

It does not automatically mean cheap, although a simple bouquet might also be less expensive. The word itself focuses more on style and complexity than on price.

So un ramo sencillo suggests something like:

• not very fancy
• not elaborate
• modest and simple

It means at the neighborhood flower shop or at the local florist.

Breaking it down:

• en la floristería = at/in the flower shop
• del barrio = de + el barrio, meaning of the neighborhood

Very often, la floristería del barrio means the florist that belongs to or is located in the neighborhood, so in natural English it often becomes:

• the local florist
• the neighborhood flower shop

Because de + el contracts to del in Spanish.

So:

• de + el barrio → del barrio

This contraction is required in normal Spanish.

The only common exception is when el is part of a proper name, such as:

• de El Escorial

But in del barrio, it is just the normal contraction.

Because en here marks the place or establishment where the order is with.

• encargar algo en una tienda = to order something at a shop

If you used a la floristería, it would more naturally suggest movement toward the flower shop, not the place where the order is held.

So here en is the natural preposition.

It is very common in Spain, which fits your sentence.

In many parts of Latin America, florería is often more common. Both words refer to a flower shop, but regional preference varies.

So for Spanish from Spain:

• floristería sounds completely natural

The structure is:

• subject
  • tener
    • past participle agreeing with the object
      • object
        • place

So here:

• Mi madre = subject
• tiene = verb
• encargado = past participle
• un ramo sencillo = object
• en la floristería del barrio = place

A very similar pattern is:

• Tengo reservada una mesa.
• Tiene preparadas las maletas.
• Tenemos comprados los billetes.

This pattern is useful for talking about things that are already arranged, reserved, prepared, bought, and so on.