thank you l.plant. i agree with you regarding opuntia,but..can you tell me witch opuntia is it?? Because it's very young plant,i've never seen her flowering and i have much troubles with identification:) the other three cactuses: they are very small so i have doubts between ferocactus and echinopsis (4th photo). am i right?
Not sure which species of Opuntia, there are many: http://www.desert-tropicals.com/Plants/Cactaceae/Opuntia.html Still leaning towards Ferocactus, but could be Echinopsis. If it produces flowers a definitive ID we'll be more possible.