Learn Farsi: عطرسازان در این صنعت از گل‌های متفاوتی استفاده می‌کنند. - Perfumers use different flowers in this industry.

It comes from ساز, the present stem of ساختن (to make or build). When attached to a noun like عطر (perfume), it forms a new noun meaning "maker of [noun]". The suffix ان at the very end makes it plural for people, giving us "perfume-makers" or perfumers.

Could we use the regular plural and say عطرسازها instead of عطرسازان?

Yes, عطرسازها is perfectly fine and very common in everyday speech. The ان plural suffix is reserved for people or animate objects and gives the sentence a slightly more formal or literary tone, which fits well when discussing a professional industry.

Why is the indefinite suffix ی placed at the end of the adjective in گل‌های متفاوتی?

In Farsi noun phrases, the indefinite ی (which means "a", "some", or "certain") typically attaches to the very end of the modifier chain rather than the noun itself. It jumps over the Ezafe linking the words, attaching to the adjective متفاوت to make گل‌های متفاوتی (some different flowers).

Why do we need the preposition از before talking about the flowers?

The Farsi verb for "to use" is the compound verb استفاده کردن. This verb strictly requires the preposition از (from) to introduce the object being used. Structurally, you are saying that they make use "from" different flowers.