Ronaldo Montoya wrote:... necessary to have a green house in the forest garden(...)or can i avoid this?
As the other posters said-I can't imagine it would be necessary, or even
desirable in your warm, dry climate.
On that subject, people can give much better help if the poster has some climate info and general location on their
profile
The perennial plants I start need to be able to cope outside;
the only things that get extra warmth are subtropical annuals like eggplants-but my climate's not in the least tropical
Ronaldo, I'm interested to know whether the info your reading is talking about climates like your own?
I don't think of greenhouses as being designed for tropical climates, only temperate or cooler.
Something that I imagine could be very useful in your climate is a shade house, which protects plants that have evolved to begin life in a forest understory