The dark purplish plants are Aeonium, most likely Aeonium arboreum.* There are many different species of this plant that come in different colors. These are tropical plants and won't tolerate freezing temps.
In the lower front is Stachys byzantian aka lammbs ear.* They get tal flower spikes and will often take over an area quickly if they are happy.* I tend to cut off the flower heads so they don't seed around.
The spikey plant on the extreme right is an Agave.* I'm not sure just which one, but these plants also don't tolerate hard freezes.
The fluffy tall plant could possibly be a Euphorbia of some sort, but I can't see it clearly.* I also can't tell what the red flowered one is.
I hope that helps,
When weeding, the best way to make sure you are removing a weed and not a valuable plant is to pull on it. If it comes out of the ground easily, it is a valuable plant.